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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 10,160,684	$ 10,146,724
Allowance for credit losses - loans	(141,457)	(141,465)	$ (125,471)	$ (132,099)
Net loans	$ 10,019,227	$ 10,005,259
Percent of total loans	100.00%	100.00%
Unearned loan fees in excess of unamortized costs	$ 8,000	$ 8,100
Discount on acquired loans, net	6,100	6,600
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	35,600	39,800
Commerical real estate - owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 865,705	$ 845,320
Percent of total loans	8.50%	8.30%
Commercial real estate - investment properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,520,261	$ 1,589,975
Percent of total loans	15.00%	15.70%
Small Balance Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,179,749	$ 1,200,251
Percent of total loans	11.60%	11.80%
Multifamily Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 696,864	$ 645,071
Allowance for credit losses - loans	$ (8,475)	$ (7,734)	(7,183)	(7,043)
Percent of total loans	6.80%	6.40%
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 191,051	$ 184,876
Percent of total loans	1.90%	1.80%
Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 362,425	$ 325,816
Percent of total loans	3.60%	3.20%
One- to four- family construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 584,655	$ 647,329
Percent of total loans	5.80%	6.40%
Land and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 329,438	$ 328,475
Percent of total loans	3.20%	3.20%
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,266,047	$ 1,283,407
Allowance for credit losses - loans	$ (33,735)	$ (33,299)	(26,655)	(26,421)
Percent of total loans	12.50%	12.70%
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program	$ 5,600	$ 7,600
Small business scored
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 960,650	$ 947,092
Percent of total loans	9.40%	9.30%
Agricultural business, including secured by farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 272,707	$ 295,077
Allowance for credit losses - loans	$ (3,094)	$ (3,475)	(2,586)	(3,190)
Percent of total loans	2.70%	2.90%
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program	$ 330	$ 334
One- to four-family residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,252,104	1,173,112
Allowance for credit losses - loans	$ (15,736)	$ (14,729)	(8,109)	(8,205)
Percent of total loans	12.30%	11.60%
Consumer—home equity revolving lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 564,334	$ 566,291
Percent of total loans	5.60%	5.60%
Consumer-other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 114,694	$ 114,632
Allowance for credit losses - loans	$ (9,009)	$ (8,971)	$ (6,995)	$ (6,951)
Percent of total loans	1.10%	1.10%

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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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