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Note 4 - Investment Securities - Scheduled Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Due in one year or less, amortized cost $ 5,034  
Due in one year or less, fair value 5,036  
Due after one year through five years, amortized cost 24,943  
Due after one year through five years, fair value 25,155  
Due after five years through ten years, amortized cost 61,846  
Due after five years through ten years, fair value 61,209  
Due after ten years, amortized cost 509,628  
Due after ten years, fair value 480,961  
Total investment securities available-for-sale, amortized cost 1,309,724 $ 708,437
Total investment securities available-for-sale, fair value 1,227,200 612,847
Residential Mortgage-Backed Securities [Member]    
Securities available-for-sale, without single maturity date, amortized cost 677,879  
Securities available-for-sale, without single maturity date, fair value 628,139  
Total investment securities available-for-sale, amortized cost 677,879 439,445
Total investment securities available-for-sale, fair value 628,139 378,838
Commercial Mortgage-Backed Securities [Member]    
Securities available-for-sale, without single maturity date, amortized cost 30,266  
Securities available-for-sale, without single maturity date, fair value 26,572  
Total investment securities available-for-sale, amortized cost 30,266 24,989
Total investment securities available-for-sale, fair value 26,572 20,892
Other Debt Obligations [Member]    
Securities available-for-sale, without single maturity date, amortized cost 128  
Securities available-for-sale, without single maturity date, fair value 128  
Total investment securities available-for-sale, amortized cost 128 171
Total investment securities available-for-sale, fair value $ 128 $ 171