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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities available for sale, amortized cost, due in one year or less $ 2,165  
Securities available for sale, fair value, due in one year or less 2,182  
Securities held to maturity, amortized cost, due in one year or less 0  
Securities held to maturity, fair value, due in one year or less 0  
Securities available for sale, amortized cost, due after one year through five years 161,603  
Securities available for sale, fair value, due after one year through five years 161,868  
Securities held to maturity, amortized cost, due after one year through five years 0  
Securities held to maturity, fair value, due after one year through five years 0  
Securities available for sale, amortized cost, due after five years through ten years 60,648  
Securities available for sale, fair value, due after five years through ten years 62,261  
Securities held to maturity, amortized cost, due after five years through ten years 0  
Securities held to maturity, fair value, due after five years through ten years 0  
Securities available for sale, amortized cost, due after ten years 83,486  
Securities available for sale, fair value, due after ten years 86,108  
Securities held to maturity, amortized cost, due after ten years 2,000  
Securities held to maturity, fair value, due after ten years 2,037  
Securities available for sale, amortized cost, single maturity 307,902  
Securities available for sale, fair value, single maturity 312,419  
Securities held to maturity, amortized cost, single maturity 2,000  
Securities held to maturity, fair value, single maturity 2,037  
Mortgage-backed securities and CMO, available for sale, amortized cost 105,539  
Mortgage-backed securities and CMO, available for sale, fair value 106,515  
Mortgage-backed securities and CMO, held to maturity, amortized cost 0  
Mortgage-backed securities and CMO, held to maturity, fair value 0  
Securities available for sale, amortized cost 413,441 $ 274,709
Securities available for sale, fair value 418,934 283,502
Securities held to maturity, amortized cost 2,000 $ 0
Securities held to maturity, fair value $ 2,037