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Note 2 - Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Due within one year, amortized cost $ 25,111  
Due within one year, fair value 25,310  
Due after one year through five years, amortized cost 49,146  
Due after one year through five years, fair value 50,979  
Due after five years through ten years, amortized cost 474,166  
Due after five years through ten years, fair value 480,614  
Due after ten years, amortized cost 112,340  
Due after ten years, fair value 108,867  
Total debt securities, amortized cost 660,763  
Total debt securities, fair value 665,770  
Equity securities, amortized cost 7,953 $ 2,836
Equity securities, fair value 8,492 $ 2,896
Total, amortized cost 1,110,099  
Total, fair value 1,107,377  
Collateralized Mortgage Backed Securities [Member]    
Debt securities, amortized cost 441,383  
Debt securities, fair value $ 433,115