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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 10,869,096	$ 10,810,455
Allowance for credit losses - loans	(151,140)	(149,643)	$ (141,457)	$ (141,465)
Net loans receivable	$ 10,717,956	$ 10,660,812
Percent of total loans	100.00%	100.00%
Unearned loan fees in excess of unamortized costs	$ 13,900	$ 12,100
Discount on acquired loans, net	4,300	4,600
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	51,500	47,800
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings	7,700,000	7,600,000
Commerical real estate - owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 905,063	$ 915,897
Percent of total loans	8.30%	8.50%
Commercial real estate - investment properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,544,885	$ 1,541,344
Percent of total loans	14.20%	14.30%
Small Balance Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,159,355	$ 1,178,500
Percent of total loans	10.70%	10.90%
Multifamily Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 809,101	$ 811,232
Allowance for credit losses - loans	$ (9,293)	$ (9,326)	(8,475)	(7,734)
Percent of total loans	7.40%	7.50%
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 158,011	$ 170,011
Percent of total loans	1.40%	1.60%
Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 573,014	$ 503,993
Percent of total loans	5.30%	4.70%
One- to four- family construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 495,931	$ 526,432
Percent of total loans	4.60%	4.90%
Land and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 344,563	$ 336,639
Percent of total loans	3.20%	3.10%
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,262,716	$ 1,255,734
Percent of total loans	11.60%	11.60%
Small business scored
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,028,067	$ 1,022,154
Percent of total loans	9.50%	9.50%
Agricultural business, including secured by farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 317,958	$ 331,089
Allowance for credit losses - loans	$ (3,890)	$ (3,865)	(3,094)	(3,475)
Percent of total loans	2.90%	3.00%
One- to four-family residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,566,834	$ 1,518,046
Allowance for credit losses - loans	$ (20,432)	$ (19,271)	(15,736)	(14,729)
Percent of total loans	14.40%	14.00%
Consumer—home equity revolving lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 597,060	$ 588,703
Percent of total loans	5.50%	5.40%
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 106,538	$ 110,681
Allowance for credit losses - loans	$ (9,518)	$ (9,238)	$ (9,009)	$ (8,971)
Percent of total loans	1.00%	1.00%

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Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings

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Loans Receivable, Net of Unearned, Unamortized Loan Fees and Costs, Loan Percentage of Total

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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