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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 10,146,724,000	$ 9,084,763,000
Allowance for credit losses – loans	(141,465,000)	(132,099,000)	$ (167,279,000)	$ (100,559,000)
Total loans, net	$ 10,005,259,000	$ 8,952,664,000
Percent of total loans	100.00%	100.00%
Unearned loan fees in excess of unamortized costs	$ 8,100,000	$ 8,600,000
Discount on acquired loans, net	(6,600,000)	(9,700,000)
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	39,800,000	29,200,000
Related party loans	683,000	700,000
Loans Receivable, Pledged	6,500,000,000	5,400,000,000
Commerical real estate - owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 845,320,000	$ 831,623,000
Percent of total loans	8.30%	9.20%
Commercial real estate - investment properties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,589,975,000	$ 1,674,027,000
Percent of total loans	15.70%	18.40%
Small Balance Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,200,251,000	$ 1,281,863,000
Percent of total loans	11.80%	14.10%
Multifamily real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 645,071,000	$ 530,885,000
Allowance for credit losses – loans	$ (7,734,000)	$ (7,043,000)	(3,893,000)	(4,754,000)
Percent of total loans	6.40%	5.80%
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 184,876,000	$ 167,998,000
Percent of total loans	1.80%	1.80%
Multifamily construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 325,816,000	$ 259,116,000
Percent of total loans	3.20%	2.90%
One-to four-family construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 647,329,000	$ 568,753,000
Percent of total loans	6.40%	6.30%
Land and Land Development Type
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 328,475,000	$ 313,454,000
Percent of total loans	3.20%	3.50%
Commercial business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 1,283,407,000	$ 1,170,780,000
Allowance for credit losses – loans	$ (33,299,000)	$ (26,421,000)	(35,007,000)	(23,370,000)
Percent of total loans	12.70%	12.90%
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program	$ 7,600,000	$ 132,600,000
Small Credit-Scored Business Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 947,092,000	$ 792,310,000
Percent of total loans	9.30%	8.70%
Agricultural business, including secured by farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 295,077,000	$ 280,578,000
Allowance for credit losses – loans	$ (3,475,000)	$ (3,190,000)	(4,914,000)	(4,120,000)
Percent of total loans	2.90%	3.10%
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program	$ 334,000
One- to four-family residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	1,173,112,000	$ 657,474,000
Allowance for credit losses – loans	$ (14,729,000)	$ (8,205,000)	$ (9,913,000)	$ (4,136,000)
Percent of total loans	11.60%	7.20%
Consumer secured by one- to four-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 566,291,000	$ 458,533,000
Percent of total loans	5.60%	5.00%
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 114,632,000	$ 97,369,000
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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.

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