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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Securities HTM:        
Securities HTM, Amortized cost $ 562,149 $ 587,322    
Securities HTM, Allowance for Credit (Losses) (180) (180)    
Securities HTM, Gross Unrealized Gains 10,578 5,292    
Securities HTM, Gross Unrealized (Losses) (43,581) (56,798)    
Securities HTM, Fair Value 528,966 535,636    
Securities held to maturity, at amortized cost, net of allowance for credit losses 561,969 587,142    
Securities AFS:        
Securities AFS, Amortized Cost 367,636 400,511    
Securities AFS, Allowance for Credit (Losses) (989)      
Securities AFS, Gross Unrealized Gains 79 160    
Securities AFS, Gross Unrealized (Losses) (51,249) (59,711)    
Securities AFS, Fair Value 315,477 340,960    
U.S. treasuries and govt. sponsored agency securities        
Securities AFS:        
Securities AFS, Amortized Cost 21,697 19,745    
Securities AFS, Gross Unrealized Gains 16 19    
Securities AFS, Gross Unrealized (Losses) (2,393) (2,783)    
Securities AFS, Fair Value 19,320 16,981    
Residential mortgage-backed and related securities        
Securities AFS:        
Securities AFS, Amortized Cost 69,415 73,438    
Securities AFS, Gross Unrealized (Losses) (6,311) (7,223)    
Securities AFS, Fair Value 63,104 66,215    
Municipal securities.        
Securities HTM:        
Securities HTM, Amortized cost 561,099 586,272    
Securities HTM, Allowance for Credit (Losses) (180) (180) $ (198) $ (198)
Securities HTM, Gross Unrealized Gains 10,578 5,292    
Securities HTM, Gross Unrealized (Losses) (43,563) (56,798)    
Securities HTM, Fair Value 527,934 534,586    
Securities AFS:        
Securities AFS, Amortized Cost 209,875 239,812    
Securities AFS, Gross Unrealized Gains 9 66    
Securities AFS, Gross Unrealized (Losses) (39,294) (46,700)    
Securities AFS, Fair Value 170,590 193,178    
Asset-backed securities        
Securities AFS:        
Securities AFS, Amortized Cost 18,087 18,885    
Securities AFS, Gross Unrealized Gains 47 48    
Securities AFS, Gross Unrealized (Losses) (167) (205)    
Securities AFS, Fair Value 17,967 18,728    
Other securities        
Securities HTM:        
Securities HTM, Amortized cost 1,050 1,050    
Securities HTM, Gross Unrealized (Losses) (18)      
Securities HTM, Fair Value 1,032 1,050    
Securities AFS:        
Securities AFS, Amortized Cost 48,562 48,631    
Securities AFS, Allowance for Credit (Losses) (989)      
Securities AFS, Gross Unrealized Gains 7 27    
Securities AFS, Gross Unrealized (Losses) (3,084) (2,800)    
Securities AFS, Fair Value $ 44,496 $ 45,858