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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 387,699 | $ 439,510
Time deposits in financial institutions |  | 1,000
Securities available-for-sale | 2,575,469 | 2,381,488
Securities held-to-maturity | 0 | 899,743
Federal Home Loan Bank and other bank stock | 75,654 | 67,842
Loans held-for-sale | 105,806 | 711,188
Loans and leases receivable, net of allowance | 6,601,767 | 5,999,791
Accrued interest receivable | 35,355 | 36,382
Derivative assets | 1,005 | 17,968
Financial liabilities |  |
Deposits | 7,063,613 | 8,908,406
Advances from Federal Home Loan Bank | 1,695,039 | 490,351
Other borrowings |  | 68,000
Long-term debt | 180,560 | 174,006
Derivative liabilities | 1,033 | 2,116
Accrued interest payable | 7,321 | 4,114
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Cash and cash equivalents | 387,699 | 439,510
Time deposits in financial institutions |  | 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 allowance | 0 | 0
Accrued interest receivable | 35,355 | 36,382
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Other borrowings |  | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 7,321 | 4,114
Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Time deposits in financial institutions |  | 0
Securities available-for-sale | 2,575,469 | 2,381,488
Securities held-to-maturity |  | 899,743
Federal Home Loan Bank and other bank stock | 75,654 | 67,842
Loans held-for-sale | 6,866 | 652,928
Loans and leases receivable, net of allowance | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 1,005 | 17,968
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 1,695,039 | 490,351
Other borrowings |  | 68,000
Long-term debt | 180,560 | 174,006
Derivative liabilities | 1,033 | 2,116
Accrued interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Time deposits in financial institutions |  | 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 | 98,940 | 58,260
Loans and leases receivable, net of allowance | 6,601,767 | 5,999,791
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 7,063,613 | 8,908,406
Advances from Federal Home Loan Bank | 0 | 0
Other borrowings |  | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 0 | 0
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 387,699 | 439,510
Time deposits in financial institutions |  | 1,000
Securities available-for-sale | 2,575,469 | 2,381,488
Securities held-to-maturity |  | 884,234
Federal Home Loan Bank and other bank stock | 75,654 | 67,842
Loans held-for-sale | 105,765 | 704,651
Loans and leases receivable, net of allowance | 6,610,074 | 5,994,308
Accrued interest receivable | 35,355 | 36,382
Derivative assets | 1,005 | 17,968
Financial liabilities |  |
Deposits | 7,292,903 | 9,142,150
Advances from Federal Home Loan Bank | 1,695,000 | 490,000
Other borrowings |  | 67,922
Long-term debt | 172,941 | 175,378
Derivative liabilities | 1,033 | 2,116
Accrued interest payable | 7,321 | 4,114
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 38,696 | 406,338
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Derivative assets | 0 |
Financial liabilities |  |
Derivative liabilities | 0 |
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Derivative assets | 1,005 |
Financial liabilities |  |
Derivative liabilities | 1,033 |
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Derivative assets | 0 |
Financial liabilities |  |
Derivative liabilities | 0 |
Recurring | Carrying Value |  |
Financial assets |  |
Derivative assets | 1,005 |
Financial liabilities |  |
Derivative liabilities | 1,033 |
Recurring | Banc Home Loan | Discontinued Operations, Disposed of by Sale | Significant Other Observable Inputs (Level 2) |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 6,400 | 348,100
Recurring | Banc Home Loan | Discontinued Operations, Disposed of by Sale | Significant Unobservable Inputs (Level 3) |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | $ 32,300 | $ 58,300

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