Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)
|
3 Months Ended |
12 Months Ended |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Collateral securing line of credit |
$ 2,781,606,000
|
$ 958,506,000
|
| Total borrowing capacity remaining |
1,276,095,000
|
760,607,000
|
| Letter of credit pledged |
100,000,000
|
75,000,000
|
| Borrowings against line of credit |
0
|
$ 250,000,000
|
| Weighted average interest rate on outstanding advances |
|
1.60%
|
| Federal Reserve Bank |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Pledged loans to the Federal Reserve Bank |
2,463,281,000
|
$ 1,407,662,000
|
| Line of credit |
1,695,639,000
|
1,013,239,000
|
| Collateral Pledged |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Securities pledged |
804,821,000
|
373,674,000
|
| Collateral Pledged | Federal Reserve Bank |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Securities pledged |
0
|
4,963,000
|
| FHLB Overnight |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Additional line available |
800,000,000
|
800,000,000
|
| Long Term Advances |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Borrowings against line of credit |
|
150,000,000
|
| 90 Day Fixed Rate Advance |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Borrowings against line of credit |
|
$ 100,000,000
|
| Advance term |
|
90 days
|
| FHLB Advance 10 Year |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Borrowings against line of credit |
|
$ 100,000
|
| Advance term |
|
10 years
|
| Early termination costs |
$ 6,838,000
|
|
| FHLB Advance 7 Year |
|
|
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |
|
|
| Borrowings against line of credit |
|
$ 50,000
|
| Advance term |
|
7 years
|