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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Due in one year or less, Amortized cost $ 49,835  
Due in one year or less, Estimated fair value 49,041  
Due after one year through five years, Amortized cost 411,718  
Due after one year through five years, Estimated fair value 384,474  
Due after five years through ten years, Amortized cost 256,813  
Due after five years through ten years, Estimated fair value 230,655  
Due after ten years, Amortized cost 12,276  
Due after ten years, Estimated fair value 10,614  
Securities, amortized cost 730,642  
Securities, fair value 674,784  
U.S. government mortgage-backed securities, amortized cost 128,941  
U.S. government mortgage-backed securities, fair value 114,126  
Total, amortized cost 859,583 $ 869,996
Securities available-for-sale $ 788,910 $ 786,438