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Note 3 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Securities held to maturity:          
Securities held to maturity, at amortized cost $ 508,703   $ 472,583    
Securities held to maturity, gross unrealized gains 5,359   49,715    
Securities held to maturity, gross unrealized (losses) (16,108)   (1)    
Securities held to maturity, fair value 497,954   522,297    
Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment Net Of Allowance For Credit Losses 508,505   472,385    
Allowance for credit losses HTM securities 198 $ 198 198 $ 174 $ 174
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 417,322   329,994    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 391   9,157    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (46,300)   (1,321)    
Debt Securities, Available-for-sale 371,413   337,830    
Municipal securities.          
Securities held to maturity:          
Securities held to maturity, at amortized cost 507,653   471,533    
Securities held to maturity, gross unrealized gains 5,359   49,715    
Securities held to maturity, gross unrealized (losses) (16,108)        
Securities held to maturity, fair value 496,904   521,248    
Allowance for credit losses HTM securities 198 $ 198 198 173 173
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 241,074   163,253    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 122   5,228    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (38,211)   (215)    
Debt Securities, Available-for-sale 202,985   168,266    
U.S. treasuries and govt. sponsored agency securities          
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 22,424   23,370    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 22   254    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,998)   (296)    
Debt Securities, Available-for-sale 20,448   23,328    
Residential mortgage-backed and related securities          
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 86,000   92,431    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 42   2,672    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,795)   (780)    
Debt Securities, Available-for-sale 81,247   94,323    
Asset-backed securities          
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 20,056   26,372    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 112   752    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (212)        
Debt Securities, Available-for-sale 19,956   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 $ 1
Securities available for sale:          
Debt Securities, Available-for-sale, Amortized Cost 47,768   24,568    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 93   251    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,084)   (30)    
Debt Securities, Available-for-sale $ 46,777   $ 24,789