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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 391,592 | $ 387,699
Securities available-for-sale | 1,992,500 | 2,575,469
Federal Home Loan Bank and other bank stock | 68,094 | 75,654
Loans held-for-sale | 27,606 | 105,806
Loans and leases receivable, net of allowance | 7,513,910 | 6,601,767
Accrued interest receivable | 38,807 | 35,355
Derivative assets | 1,534 | 1,005
Financial liabilities |  |
Deposits | 7,689,324 | 7,063,613
Advances from Federal Home Loan Bank | 1,517,761 | 1,695,039
Long-term debt | 174,059 | 180,560
Derivative liabilities | 1,600 | 1,033
Accrued interest payable | 13,253 | 7,321
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Cash and cash equivalents | 391,592 | 387,699
Securities available-for-sale | 0 | 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 | 38,807 | 35,355
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 13,253 | 7,321
Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale | 1,992,500 | 2,575,469
Federal Home Loan Bank and other bank stock | 68,094 | 75,654
Loans held-for-sale | 2,566 | 6,866
Loans and leases receivable, net of allowance | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 1,534 | 1,005
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 1,517,761 | 1,695,039
Long-term debt | 174,059 | 180,560
Derivative liabilities | 1,600 | 1,033
Accrued interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale | 25,040 | 98,940
Loans and leases receivable, net of allowance | 7,513,910 | 6,601,767
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 7,689,324 | 7,063,613
Advances from Federal Home Loan Bank | 0 | 0
Long-term debt | 0 | 0
Derivative liabilities | 0 | 0
Accrued interest payable | 0 | 0
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 391,592 | 387,699
Securities available-for-sale | 1,992,500 | 2,575,469
Federal Home Loan Bank and other bank stock | 68,094 | 75,654
Loans held-for-sale | 27,606 | 105,765
Loans and leases receivable, net of allowance | 7,638,681 | 6,610,074
Accrued interest receivable | 38,807 | 35,355
Derivative assets | 1,534 | 1,005
Financial liabilities |  |
Deposits | 7,916,644 | 7,292,903
Advances from Federal Home Loan Bank | 1,520,000 | 1,695,000
Long-term debt | 173,174 | 172,941
Derivative liabilities | 1,600 | 1,033
Accrued interest payable | 13,253 | 7,321
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |
Financial liabilities |  |
Loans held-for-sale, carried at fair value | 19,490 | 38,696
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 | 1,534 |
Financial liabilities |  |
Derivative liabilities | 1,600 |
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Derivative assets | 0 |
Financial liabilities |  |
Derivative liabilities | 0 |
Recurring | Carrying Value |  |
Financial assets |  |
Derivative assets | 1,534 |
Financial liabilities |  |
Derivative liabilities | 1,600 |
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 | 2,100 | 6,400
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 | $ 17,400 | $ 32,300

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