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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 100.00% 100.00%    
Unearned loan fees in excess of unamortized costs $ (15,500,000) $ (12,100,000)    
Discount on acquired loans, net 3,500,000 4,600,000    
Financing Receivable, Accrued Interest, before Allowance for Credit Loss 47,700,000 47,800,000    
Loans Receivable, Pledged 7,900,000,000 7,600,000,000    
Related party loans 682,600 708,000    
Financing Receivable, before Allowance for Credit Loss 11,354,656,000 10,810,455,000    
Financing Receivable, Allowance for Credit Loss (155,521,000) (149,643,000) $ (141,465,000) $ (132,099,000)
Financing Receivable, after Allowance for Credit Loss $ 11,199,135,000 $ 10,660,812,000    
Commerical real estate - owner-occupied [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 9.00% 8.00%    
Financing Receivable, before Allowance for Credit Loss $ 1,027,426,000 $ 915,897,000    
Commercial real estate - investment properties [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 14.00% 14.00%    
Financing Receivable, before Allowance for Credit Loss $ 1,623,672,000 $ 1,541,344,000    
Small Balance Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 11.00% 11.00%    
Financing Receivable, before Allowance for Credit Loss   $ 1,178,500,000    
Multifamily real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 8.00% 8.00%    
Financing Receivable, before Allowance for Credit Loss $ 894,425,000 $ 811,232,000    
Financing Receivable, Allowance for Credit Loss $ (10,308,000) $ (9,326,000) (7,734,000) (7,043,000)
Commercial Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 1.00% 2.00%    
Financing Receivable, before Allowance for Credit Loss $ 122,362,000 $ 170,011,000    
Multifamily construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 5.00% 5.00%    
Financing Receivable, before Allowance for Credit Loss $ 513,706,000 $ 503,993,000    
One-to four-family construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 5.00% 5.00%    
Financing Receivable, before Allowance for Credit Loss $ 514,220,000 $ 526,432,000    
Land and Land Development Type        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 3.00% 3.00%    
Financing Receivable, before Allowance for Credit Loss   $ 336,639,000    
Commercial business [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 11.00% 12.00%    
Financing Receivable, before Allowance for Credit Loss $ 1,318,333,000 $ 1,255,734,000    
Financing Receivable, Allowance for Credit Loss $ (38,611,000) $ (35,464,000) (33,299,000) (26,421,000)
Small Credit-Scored Business Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 10.00% 9.00%    
Financing Receivable, before Allowance for Credit Loss $ 1,104,117,000 $ 1,022,154,000    
Agricultural business, including secured by farmland [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 3.00% 3.00%    
Financing Receivable, before Allowance for Credit Loss $ 340,280,000 $ 331,089,000    
Financing Receivable, Allowance for Credit Loss $ (5,727,000) $ (3,865,000) (3,475,000) (3,190,000)
One- to four-family residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 14.00% 14.00%    
Financing Receivable, before Allowance for Credit Loss $ 1,591,260,000 $ 1,518,046,000    
Financing Receivable, Allowance for Credit Loss $ (20,807,000) $ (19,271,000) $ (14,729,000) $ (8,205,000)
Consumer secured by one- to four-family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 5.00% 5.00%    
Financing Receivable, before Allowance for Credit Loss   $ 588,703,000    
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of total loans 1.00% 1.00%    
Financing Receivable, before Allowance for Credit Loss $ 95,720,000 $ 110,681,000    
Financing Receivable [Member] | Commerical real estate - owner-occupied [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,027,426,000      
Financing Receivable [Member] | Commercial real estate - investment properties [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,623,672,000      
Financing Receivable [Member] | Small Balance Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,213,792,000      
Financing Receivable [Member] | Multifamily real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 894,425,000      
Financing Receivable [Member] | Commercial Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 122,362,000      
Financing Receivable [Member] | Multifamily construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 513,706,000      
Financing Receivable [Member] | One-to four-family construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 514,220,000      
Financing Receivable [Member] | Land and Land Development Type        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 369,663,000      
Financing Receivable [Member] | Commercial business [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,318,333,000      
Financing Receivable [Member] | Small Credit-Scored Business Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,104,117,000      
Financing Receivable [Member] | Agricultural business, including secured by farmland [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 340,280,000      
Financing Receivable [Member] | One- to four-family residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 1,591,260,000      
Financing Receivable [Member] | Consumer secured by one- to four-family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss 625,680,000      
Financing Receivable [Member] | Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 95,720,000