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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 10,810,455,000 $ 10,146,724,000    
Allowance for credit losses – loans (149,643,000) (141,465,000) $ (132,099,000) $ (167,279,000)
Net loans receivable $ 10,660,812,000 $ 10,005,259,000    
Percent of total loans 100.00% 100.00%    
Unearned loan fees in excess of unamortized costs $ (12,100,000) $ (8,100,000)    
Discount on acquired loans, net 4,600,000 6,600,000    
Financing Receivable, Accrued Interest, before Allowance for Credit Loss 47,800,000 39,800,000    
Loans Receivable, Pledged 7,600,000,000 6,500,000,000    
Related party loans 708,000 683,000    
Commerical real estate - owner-occupied [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 915,897,000 $ 845,320,000    
Percent of total loans 9.00% 8.00%    
Commercial real estate - investment properties [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 1,541,344,000 $ 1,589,975,000    
Percent of total loans 14.00% 16.00%    
Small Balance Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 1,178,500,000 $ 1,200,251,000    
Percent of total loans 11.00% 12.00%    
Multifamily real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 811,232,000 $ 645,071,000    
Allowance for credit losses – loans $ (9,326,000) $ (7,734,000) (7,043,000) (3,893,000)
Percent of total loans 8.00% 6.00%    
Commercial Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 170,011,000 $ 184,876,000    
Percent of total loans 1.00% 2.00%    
Multifamily construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 503,993,000 $ 325,816,000    
Percent of total loans 5.00% 3.00%    
One-to four-family construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 526,432,000 $ 647,329,000    
Percent of total loans 5.00% 6.00%    
Land and Land Development Type        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 336,639,000 $ 328,475,000    
Percent of total loans 3.00% 3.00%    
Commercial business [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 1,255,734,000 $ 1,283,407,000    
Allowance for credit losses – loans $ (35,464,000) $ (33,299,000) (26,421,000) (35,007,000)
Percent of total loans 11.00% 13.00%    
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program $ 3,600,000 $ 7,600,000    
Small Credit-Scored Business Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 1,022,154,000 $ 947,092,000    
Percent of total loans 10.00% 9.00%    
Agricultural business, including secured by farmland [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 331,089,000 $ 295,077,000    
Allowance for credit losses – loans $ (3,865,000) $ (3,475,000) (3,190,000) (4,914,000)
Percent of total loans 3.00% 3.00%    
One- to four-family residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 1,518,046,000 $ 1,173,112,000    
Allowance for credit losses – loans $ (19,271,000) $ (14,729,000) $ (8,205,000) $ (9,913,000)
Percent of total loans 14.00% 12.00%    
Consumer secured by one- to four-family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 588,703,000 $ 566,291,000    
Percent of total loans 5.00% 6.00%    
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross $ 110,681,000 $ 114,632,000    
Percent of total loans 1.00% 1.00%