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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 379,509 | $ 220,819
Securities available-for-sale, at fair value | 1,270,830 | 1,231,431
Federal Home Loan Bank and other bank stock | 44,964 | 44,506
Loans held-for-sale, carried at fair value | 1,408 | 1,413
Loans receivable, net of allowance for credit losses | 5,754,031 | 5,936,708
Accrued interest receivable | 30,270 | 29,445
Derivative assets | 4,707 | 7,632
Financial liabilities |  |
Deposits | 6,143,213 | 6,087,714
Advances from Federal Home Loan Bank | 669,799 | 585,416
Long-term debt | 272,260 | 273,230
Derivative liabilities | 4,906 | 8,102
Accrued interest payable | 6,718 | 3,714
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Cash and cash equivalents | 379,509 | 220,819
Securities available-for-sale, at fair value | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale, carried at fair value | 0 | 0
Loans receivable, net of allowance for credit losses | 0 | 0
Accrued interest receivable | 30,270 | 29,445
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 | 6,718 | 3,714
Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale, at fair value | 1,270,830 | 1,231,431
Federal Home Loan Bank and other bank stock | 44,964 | 44,506
Loans held-for-sale, carried at fair value | 465 | 468
Loans receivable, net of allowance for credit losses | 0 | 0
Accrued interest receivable | 0 | 0
Derivative assets | 4,707 | 7,632
Financial liabilities |  |
Deposits | 0 | 0
Advances from Federal Home Loan Bank | 669,799 | 585,416
Long-term debt | 272,260 | 273,230
Derivative liabilities | 4,906 | 8,102
Accrued interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available-for-sale, at fair value | 0 | 0
Federal Home Loan Bank and other bank stock | 0 | 0
Loans held-for-sale, carried at fair value | 943 | 945
Loans receivable, net of allowance for credit losses | 5,754,031 | 5,936,708
Accrued interest receivable | 0 | 0
Derivative assets | 0 | 0
Financial liabilities |  |
Deposits | 6,143,213 | 6,087,714
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 | 379,509 | 220,819
Securities available-for-sale, at fair value | 1,270,830 | 1,231,431
Federal Home Loan Bank and other bank stock | 44,964 | 44,506
Loans held-for-sale, carried at fair value | 1,408 | 1,413
Loans receivable, net of allowance for credit losses | 5,685,048 | 5,817,375
Accrued interest receivable | 30,270 | 29,445
Derivative assets | 4,707 | 7,632
Financial liabilities |  |
Deposits | 6,142,042 | 6,085,800
Advances from Federal Home Loan Bank | 635,105 | 539,795
Long-term debt | 256,441 | 256,315
Derivative liabilities | 4,906 | 8,102
Accrued interest payable | $ 6,718 | $ 3,714

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