v3.26.1
LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Allowance for Loan Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses $ (1,292) $ (4,549)    
Recoveries 253 931    
Charge-offs (1,469) (3,678)    
Financing Receivable, Allowance for Credit Loss 160,352 157,323 $ 160,276 $ 155,521
Commercial Real Estate        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses (178) 811    
Recoveries 11 57    
Charge-offs 0 0    
Financing Receivable, Allowance for Credit Loss 41,788 40,076 41,599 40,830
Multifamily Real Estate        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses (604) 199    
Recoveries 0 0    
Charge-offs 0 0 0  
Financing Receivable, Allowance for Credit Loss 9,201 10,109 9,805 10,308
Construction and Land        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses 923 3,004    
Recoveries 4 0    
Charge-offs 0 0    
Financing Receivable, Allowance for Credit Loss 34,589 32,042 35,508 29,038
Commercial Business and Small Business Scored        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses 2,449 (2,798)    
Recoveries 81 557    
Charge-offs (863) (3,301)    
Financing Receivable, Allowance for Credit Loss 39,452 38,665 37,785 38,611
Agricultural Business        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses 641 96    
Recoveries 4 10    
Charge-offs 0 0 (2,416)  
Financing Receivable, Allowance for Credit Loss 4,930 5,641 5,567 5,727
One- to Four-Family Residential        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses 75 (230)    
Recoveries 13 188    
Charge-offs 0 (13) (13)  
Financing Receivable, Allowance for Credit Loss 19,640 20,752 19,552 20,807
Consumer Loan [Member]        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
(Recapture) provision for credit losses (758) (83)    
Recoveries 140 119    
Charge-offs (606) (364) (1,619)  
Financing Receivable, Allowance for Credit Loss 10,752 $ 10,038 10,460 $ 10,200
Commercial Business        
Financing Receivable, Allowance for Loan Losses [Roll Forward]        
Charge-offs $ (286)   $ (3,598)