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NOTE 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Securities held to maturity:      
Securities held to maturity, at amortized cost $ 484,177   $ 476,165
Securities held to maturity, gross unrealized gains 47,122   45,360
Securities held to maturity, gross unrealized (losses) (20)   (248)
Securities held to maturity, fair value 531,279   521,277
Securities held to maturity, at amortized cost, net of allowance for credit losses 484,003   476,165
Allowance for credit losses HTM securities 174 $ 174  
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 337,012   350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,448   12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,744)   (524)
Debt Securities, Available-for-sale 344,716   361,966
Municipal securities.      
Securities held to maturity:      
Securities held to maturity, at amortized cost 483,127   475,115
Securities held to maturity, gross unrealized gains 47,122   45,360
Securities held to maturity, gross unrealized (losses) (20)   (248)
Securities held to maturity, fair value 530,229   520,227
Allowance for credit losses HTM securities 173 173  
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 162,964   147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,124   5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (729)   (48)
Debt Securities, Available-for-sale 166,359   152,408
U.S. treasuries and govt. sponsored agency securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 23,616   14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 413   447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (340)   (47)
Debt Securities, Available-for-sale 23,689   15,336
Residential mortgage-backed and related securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 97,762   127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,627   5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (645)   (338)
Debt Securities, Available-for-sale 100,744   132,842
Asset-backed securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 29,622   39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 985   1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax     (91)
Debt Securities, Available-for-sale 30,607   40,683
Other Securities      
Securities held to maturity:      
Securities held to maturity, at amortized cost 1,050   1,050
Securities held to maturity, fair value 1,050   1,050
Allowance for credit losses HTM securities 1 $ 1  
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 23,048   20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 299   147
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (30)    
Debt Securities, Available-for-sale $ 23,317   $ 20,697