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NOTE 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Securities held to maturity:      
Securities held to maturity, at amortized cost $ 473,333   $ 476,165
Securities held to maturity, gross unrealized gains 50,129   45,360
Securities held to maturity, gross unrealized (losses) (20)   (248)
Securities held to maturity, fair value 523,442   521,277
Securities held to maturity, at amortized cost, net of allowance for credit losses 473,159   476,165
Allowance for credit losses HTM securities 174 $ 174  
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 326,388   350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 11,781   12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (883)   (524)
Debt Securities, Available-for-sale 337,286   361,966
Municipal securities.      
Securities held to maturity:      
Securities held to maturity, at amortized cost 472,283   475,115
Securities held to maturity, gross unrealized gains 50,129   45,360
Securities held to maturity, gross unrealized (losses) (20)   (248)
Securities held to maturity, fair value 522,392   520,227
Allowance for credit losses HTM securities 173 173  
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 163,607   147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,861   5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (148)   (48)
Debt Securities, Available-for-sale 169,320   152,408
U.S. govt. sponsored agency securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 14,310   14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 504   447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (144)   (47)
Debt Securities, Available-for-sale 14,670   15,336
Residential mortgage-backed and related securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 102,625   127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,094   5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (581)   (338)
Debt Securities, Available-for-sale 106,138   132,842
Asset-backed securities      
Securities available for sale:      
Debt Securities, Available-for-sale, Amortized Cost 30,707   39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,072   1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax     (91)
Debt Securities, Available-for-sale 31,779   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 15,139   20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 250   147
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (10)    
Debt Securities, Available-for-sale $ 15,379   $ 20,697