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Note 4 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Allowance for Credit Losses by Category (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Beginning balance $ 31,534 $ 27,992 $ 27,992
Provision for credit losses on loans 1,421 2,355  
Charge-offs (1,894) (720) (3,476)
Recoveries 418 310  
Net charge-offs (1,476) (410)  
Total ending ACL balance 31,479 29,937 31,534
Real Estate Portfolio Segment [Member]      
Beginning balance 14,107 12,123 12,123
Provision for credit losses on loans 146 459  
Charge-offs 0 (10)  
Recoveries 0 0  
Net charge-offs 0 (10)  
Total ending ACL balance 14,253 12,572 14,107
Consumer Portfolio Segment [Member]      
Beginning balance 13,357 12,109 12,109
Provision for credit losses on loans 644 1,691  
Charge-offs (1,486) (709)  
Recoveries 418 310  
Net charge-offs (1,068) (399)  
Total ending ACL balance 12,933 13,401 13,357
Commercial Business Portfolio Segment [Member]      
Beginning balance 4,070 3,760 3,760
Provision for credit losses on loans 631 205  
Charge-offs (408) (1)  
Recoveries 0 0  
Net charge-offs (408) (1)  
Total ending ACL balance 4,293 3,964 4,070
Unallocated Financing Receivables [Member]      
Beginning balance 0 0 0
Provision for credit losses on loans 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Net charge-offs 0 0  
Total ending ACL balance $ 0 $ 0 $ 0