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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 11,143,848		$ 10,810,455
Allowance for credit losses - loans	(152,848)	$ (151,140)	(149,643)	$ (144,680)	$ (141,457)	$ (141,465)
Net loans receivable	$ 10,991,000		$ 10,660,812
Percent of total loans	100.00%		100.00%
Unearned loan fees in excess of unamortized costs	$ 14,900		$ 12,100
Discount on acquired loans, net	4,100		4,600
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	53,300		47,800
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings	8,000,000		7,600,000
Commerical real estate - owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 950,922		$ 915,897
Percent of total loans	9.00%		8.00%
Commercial real estate - investment properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,536,142		$ 1,541,344
Percent of total loans	14.00%		14.00%
Small balance CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,234,302		$ 1,178,500
Percent of total loans	11.00%		11.00%
Multifamily Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 717,089		$ 811,232
Allowance for credit losses - loans	$ (8,253)	(9,293)	$ (9,326)	(8,039)	(8,475)	(7,734)
Percent of total loans	6.00%		8.00%
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 173,296		$ 170,011
Percent of total loans	2.00%		2.00%
Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 663,989		$ 503,993
Percent of total loans	6.00%		5.00%
One- to four- family construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 490,237		$ 526,432
Percent of total loans	4.00%		5.00%
Land and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 352,184		$ 336,639
Percent of total loans	3.00%		3.00%
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,298,134		$ 1,255,734
Percent of total loans	12.00%		12.00%
Small business scored
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,074,465		$ 1,022,154
Percent of total loans	10.00%		9.00%
Agricultural business, including secured by farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 334,583		$ 331,089
Allowance for credit losses - loans	$ (4,045)	(3,890)	$ (3,865)	(3,573)	(3,094)	(3,475)
Percent of total loans	3.00%		3.00%
One- to four-family residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,603,266		$ 1,518,046
Allowance for credit losses - loans	$ (20,906)	(20,432)	$ (19,271)	(16,737)	(15,736)	(14,729)
Percent of total loans	14.00%		14.00%
Consumer—home equity revolving lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 611,739		$ 588,703
Percent of total loans	5.00%		5.00%
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 103,500		$ 110,681
Allowance for credit losses - loans	$ (10,148)	$ (9,518)	$ (9,238)	$ (8,971)	$ (9,009)	$ (8,971)
Percent of total loans	1.00%		1.00%

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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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