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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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