BORROWINGS AND BORROWING CAPACITY - Narrative (Details) - USD ($)
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1 Months Ended |
12 Months Ended |
Sep. 30, 2015 |
Oct. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Debt Instrument [Line Items] |
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| Increase (decrease) in other borrowings |
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$ 18,000,000
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$ 10,100,000
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| Repayments of debt |
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$ 27,500,000
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| Borrowing Agreement | Prime Rate |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate |
0.25%
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| Interest rate, effective percentage |
3.50%
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| Federal Home Loan Bank of Dallas |
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| Debt Instrument [Line Items] |
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| Borrowing capacity |
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683,100,000.0
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| Remaining borrowing capacity |
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362,700,000
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| Outstanding amount |
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320,400,000
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| Letters of credit outstanding, amount |
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35,400,000
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| Federal Home Loan Bank of Dallas | Expire in February 2017 |
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| Debt Instrument [Line Items] |
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| Letters of credit outstanding, amount |
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3,000,000
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| Federal Home Loan Bank of Dallas | Expire in August 2017 |
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| Debt Instrument [Line Items] |
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| Letters of credit outstanding, amount |
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7,300,000
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| Federal Home Loan Bank of Dallas | Expire in October 2017 |
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| Debt Instrument [Line Items] |
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| Letters of credit outstanding, amount |
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25,000,000
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| Federal Home Loan Bank of Dallas | Short-term Debt |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, amount of advances |
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$ 85,000,000
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| Federal Home Loan Bank of Dallas | Short-term Debt | Weighted Average |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, interest rate |
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0.55%
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| Federal Home Loan Bank of Dallas | Long-term Debt |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, amount of advances |
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$ 200,000,000
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| Federal Home Loan Bank of Dallas | Long-term Debt | Expire in April 2018 |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, amount of advances |
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100,000,000
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| Federal Home Loan Bank of Dallas | Long-term Debt | Expire in May 2018 |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, amount of advances |
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$ 100,000,000
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| Federal Home Loan Bank of Dallas | Long-term Debt | Weighted Average |
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| Debt Instrument [Line Items] |
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| Federal Home Loan Bank, interest rate |
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0.56%
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