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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 611,826 | $ 439,510
Time deposits in financial institutions | 1,000 | 1,000
Securities available-for-sale | 2,755,664 | 2,381,488
Securities held-to-maturity |  | 899,743
Federal Home Loan Bank and other bank stock | 67,063 | 67,842
Loans held-for-sale | 109,756 | 711,188
Loans and leases receivable, net of ALLL | 6,195,299 | 5,999,791
Accrued interest receivable | 34,798 | 36,382
Derivative assets | 1,112 | 17,968
Financial liabilities |  |
Deposits | 7,198,216 | 8,908,406
Advances from Federal Home Loan Bank | 1,472,820 | 490,351
Securities sold under repurchase agreements | 36,520 |
Other borrowings |  | 68,000
Long term debt | 175,873 | 174,006
Derivative liabilities | 1,146 | 2,116
Accrued interest payable | 8,074 | 4,114
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 58,954 | 406,338
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Cash and cash equivalents | 611,826 | 439,510
Time deposits in financial institutions | 1,000 | 1,000
Securities available-for-sale | 0 | 0
Securities held-to-maturity |  | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale | 0 | 0
Loans and leases receivable, net of ALLL | 0 | 0
Accrued interest receivable | 34,798 | 36,382
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Securities sold under repurchase agreements | 0 |
Other borrowings |  | 0
Long term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 8,074 | 4,114
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring |  |
Financial assets |  |
Loans held-for-sale | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Time deposits in financial institutions | 0 | 0
Securities available-for-sale | 2,755,664 | 2,381,488
Securities held-to-maturity |  | 899,743
Federal Home Loan Bank and other bank stock | 67,063 | 67,842
Loans held-for-sale | 25,392 | 652,928
Loans and leases receivable, net of ALLL | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 1,112 | 17,968
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 1,472,820 | 490,351
Securities sold under repurchase agreements | 36,520 |
Other borrowings |  | 68,000
Long term debt | 175,873 | 174,006
Derivative liabilities | 1,146 | 2,116
Accrued interest payable | 0 | 0
Significant Other Observable Inputs (Level 2) | Recurring |  |
Financial assets |  |
Loans held-for-sale | 17,778 | 358,714
Significant Other Observable Inputs (Level 2) | Recurring | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 17,800 | 348,100
Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Time deposits in financial institutions | 0 | 0
Securities available-for-sale | 0 | 0
Securities held-to-maturity |  | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale | 84,364 | 58,260
Loans and leases receivable, net of ALLL | 6,195,299 | 5,999,791
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 7,198,216 | 8,908,406
Advances from Federal Home Loan Bank | 0 | 0
Securities sold under repurchase agreements | 0 |
Other borrowings |  | 0
Long term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) | Recurring |  |
Financial assets |  |
Loans held-for-sale | 84,364 | 58,260
Significant Unobservable Inputs (Level 3) | Recurring | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 41,200 | 58,300
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 611,826 | 439,510
Time deposits in financial institutions | 1,000 | 1,000
Securities available-for-sale | 2,755,664 | 2,381,488
Securities held-to-maturity |  | 884,234
Federal Home Loan Bank and other bank stock | 67,063 | 67,842
Loans held-for-sale | 109,084 | 704,651
Loans and leases receivable, net of ALLL | 6,181,825 | 5,994,308
Accrued interest receivable | 34,798 | 36,382
Derivative assets | 1,112 | 17,968
Financial liabilities |  |
Deposits | 7,403,593 | 9,142,150
Advances from Federal Home Loan Bank | 1,470,000 | 490,000
Securities sold under repurchase agreements | 36,520 |
Other borrowings |  | 67,922
Long term debt | 172,865 | 175,378
Derivative liabilities | 1,146 | 2,116
Accrued interest payable | 8,074 | 4,114
Carrying Value | Recurring |  |
Financial assets |  |
Loans held-for-sale | $ 102,142 | $ 416,974

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