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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Securities held to maturity:      
Securities held to maturity, at amortized cost $ 476,823 $ 472,583  
Securities held to maturity, gross unrealized gains 10,649 49,715  
Securities held to maturity, gross unrealized (losses) (3,095) (1)  
Securities held to maturity, fair value 484,377 522,297  
Securities held to maturity, at amortized cost, net of allowance for credit losses 476,625 472,385  
Allowance for credit losses HTM securities 198   $ 174
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 368,020 329,994  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,536 9,157  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (22,870) (1,321)  
Debt Securities, Available-for-sale 346,686 337,830  
Municipal securities.      
Securities held to maturity:      
Securities held to maturity, at amortized cost 475,773 471,533  
Securities held to maturity, gross unrealized gains 10,649 49,715  
Securities held to maturity, gross unrealized (losses) (3,095)    
Securities held to maturity, fair value 483,327 521,248  
Allowance for credit losses HTM securities 198   173
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 209,052 163,253  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 701 5,228  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (18,280) (215)  
Debt Securities, Available-for-sale 191,473 168,266  
U.S. treasuries and govt. sponsored agency securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 22,655 23,370  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 37 254  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,312) (296)  
Debt Securities, Available-for-sale 21,380 23,328  
Residential mortgage-backed and related securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 88,935 92,431  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 207 2,672  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2,762) (780)  
Debt Securities, Available-for-sale 86,380 94,323  
Asset-backed securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 22,859 26,372  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 449 752  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (76)    
Debt Securities, Available-for-sale 23,232 27,124  
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 1,050 1,049  
Allowance for credit losses HTM securities     $ 1
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 24,519 24,568  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 142 251  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (440) (30)  
Debt Securities, Available-for-sale $ 24,221 $ 24,789