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BORROWINGS - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Overnight maturities | 28.70% |  | 57.20%
Short-term advances, percentage bearing fixed interest rate | 71.30% |  | 42.80%
Repayments of subordinated debt | $ 9,500,000 |  |
Repayments of other long-term debt | 15,500,000 |  |
Redeemed amount | 227,000,000 | $ 56,000,000 |
FHLB [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit available with FHLB | 8,000,000,000.0 |  |
Credit with FHLB utilized | $ 2,600,000,000 |  |
Minimum [Member] | FHLB [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rates | 1.62% |  | 1.39%
Maximum [Member] | FHLB [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rates | 2.71% |  | 4.19%
Subordinated Notes Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowings, face amount | $ 120,000,000.0 |  |
Proceeds from debt, net of issuance costs | 118,200,000 |  |
Trust Preferred Securities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redeemed amount | $ 44,000,000.0 |  |

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