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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Securities held to maturity:    
Securities held to maturity, at amortized cost $ 472,583 $ 476,165
Securities held to maturity, gross unrealized gains 49,715 45,360
Securities held to maturity, gross unrealized (losses) (1) (248)
Securities held to maturity, fair value 522,297 521,277
Securities held to maturity, at amortized cost, net of allowance for credit losses 472,385 476,165
Allowance for credit losses HTM securities 198  
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 329,994 350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,157 12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,321) (524)
Debt Securities, Available-for-sale 337,830 361,966
Municipal securities.    
Securities held to maturity:    
Securities held to maturity, at amortized cost 471,533 475,115
Securities held to maturity, gross unrealized gains 49,715 45,360
Securities held to maturity, gross unrealized (losses)   (248)
Securities held to maturity, fair value 521,248 520,227
Allowance for credit losses HTM securities 198  
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 163,253 147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,228 5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (215) (48)
Debt Securities, Available-for-sale 168,266 152,408
U.S. treasuries and govt. sponsored agency securities    
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 23,370 14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 254 447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (296) (47)
Debt Securities, Available-for-sale 23,328 15,336
Residential mortgage-backed and related securities    
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 92,431 127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,672 5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (780) (338)
Debt Securities, Available-for-sale 94,323 132,842
Asset-backed securities    
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 26,372 39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 752 1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax   (91)
Debt Securities, Available-for-sale 27,124 40,683
Other Securities    
Securities held to maturity:    
Securities held to maturity, at amortized cost 1,050 1,050
Securities held to maturity, gross unrealized (losses) (1)  
Securities held to maturity, fair value 1,049 1,050
Securities available for sale:    
Debt Securities, Available-for-sale, Amortized Cost 24,568 20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 251 147
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (30)  
Debt Securities, Available-for-sale $ 24,789 $ 20,697