Borrowings - Additional information (Details)
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2020
USD ($)
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Feb. 24, 2020
USD ($)
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Jun. 30, 2021
USD ($)
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Dec. 31, 2021
USD ($)
item
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Dec. 31, 2020
USD ($)
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Dec. 31, 2018
USD ($)
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| Borrowings |
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| Threshold percentage of stockholders' equity |
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10.00%
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| Borrowings at FHLBC as percentage of total assets |
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35.00%
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| FHLBC stock |
$ 3,700,000
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$ 7,100,000
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$ 3,700,000
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| Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock |
9,917,000
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13,257,000
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9,917,000
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| Fair value of securities collateralized |
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7,100,000
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| Proceeds from term note |
20,000,000.0
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$ 20,000,000.0
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| Cash distribution rate of trust preferred securities (as a percent) |
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7.80%
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| Senior notes |
44,375,000
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44,480,000
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44,375,000
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| Basis points added to reference rate (as a percent) |
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175.00%
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| Debt issuance costs |
1,000
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1,000
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1,000
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| Total borrowings |
160,521,000
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198,876,000
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160,521,000
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| GCFC/ABC Bank |
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| Borrowings |
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| FHLBC advance amount |
$ 6,400,000
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$ 6,100,000
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$ 6,400,000
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| Debt Instrument, Term |
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4 years 3 months
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5 years 3 months
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| Debt assumed |
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$ 23,400,000
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| GCFC/ABC Bank | Maximum |
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| Borrowings |
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| Interest rate (as a percent) |
2.83%
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2.83%
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2.83%
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| Securities sold under repurchase agreements |
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| Borrowings |
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| Carrying amount of securities secured |
$ 67,000,000.0
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$ 50,300,000
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$ 67,000,000.0
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| Fair value of the pledged collateral |
94,400,000
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$ 113,000,000.0
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94,400,000
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| Number of customers having secured balances exceeding specified percentage of stockholders equity | item |
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0
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| Total borrowings |
66,980,000
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$ 50,337,000
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66,980,000
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| Securities sold under repurchase agreements | Minimum |
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| Borrowings |
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| Maturity |
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1 day
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| Securities sold under repurchase agreements | Maximum |
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| Borrowings |
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| Maturity |
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90 days
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| Federal Home Loan Bank Advances |
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| Borrowings |
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| FHLBC advance amount |
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$ 0
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| FHLBC stock |
3,700,000
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7,100,000
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3,700,000
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| Fair value of securities collateralized |
54,700,000
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54,700,000
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| Principal balance of loans collateralized |
625,800,000
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536,900,000
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625,800,000
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| Maximum borrowing capacity |
390,400,000
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390,400,000
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| Amount available for additional borrowings |
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313,100,000
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| Subordinated debentures |
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| Borrowings |
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| Total borrowings |
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59,212,000
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| Notes payable and other borrowings |
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| Borrowings |
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| Total borrowings |
23,393,000
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19,074,000
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23,393,000
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| Junior subordinated debentures |
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| Borrowings |
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| Total borrowings |
25,773,000
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$ 25,773,000
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25,773,000
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| Senior notes |
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| Borrowings |
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| Interest rate (as a percent) |
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5.75%
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| Senior notes |
44,400,000
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$ 44,500,000
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44,400,000
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| Debt Instrument, Term |
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10 years
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| Interest rate term |
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5 years
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| Effective interest rate |
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6.06%
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| Debt issuance costs |
625,000
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$ 520,000
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625,000
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| Amortization period for deferred financing costs |
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10 years
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| Total borrowings |
44,375,000
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$ 44,480,000
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$ 44,375,000
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| Debt instrument redemption price, percentage |
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100.00%
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| Senior notes | Debt Instrument, Variable Rate Base LIBOR [Member] |
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| Borrowings |
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| Basis points added to reference rate (as a percent) |
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385.00%
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| Term Debt |
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| Borrowings |
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| Proceeds from term note |
$ 13,000,000.0
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$ 20,000,000.0
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| Effective interest rate |
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1.85%
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| Debt term |
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3 years
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| Subordinated Notes Due 2031 |
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| Borrowings |
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| Interest rate (as a percent) |
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3.50%
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| Outstanding, net of deferred issuance costs |
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$ 59,200,000
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| Face amount |
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$ 60,000,000.0
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| Subordinated Notes Due 2031 | Three Months Secured Overnight Financing Rate |
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| Borrowings |
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| Basis points added to reference rate (as a percent) |
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2.73%
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