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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Securities HTM:    
Securities HTM, Amortized Cost $ 587,322 $ 472,583
Securities HTM, Gross Unrealized Gains 5,292 49,715
Securities HTM, Gross Unrealized (Losses) (56,978) (1)
Securities HTM, Fair Value 535,636 522,297
Securities held to maturity, at amortized cost, net of allowance for credit losses 587,142 472,385
Allowance for credit losses HTM securities 180 198
Securities AFS:    
Securities AFS, Amortized Cost 400,511 329,994
Securities AFS, Gross Unrealized Gains 160 9,157
Securities AFS, Gross Unrealized (Losses) (59,711) (1,321)
Securities AFS, Fair Value 340,960 337,830
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Amortized Cost 19,745 23,370
Securities AFS, Gross Unrealized Gains 19 254
Securities AFS, Gross Unrealized (Losses) (2,783) (296)
Securities AFS, Fair Value 16,981 23,328
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Amortized Cost 73,438 92,431
Securities AFS, Gross Unrealized Gains   2,672
Securities AFS, Gross Unrealized (Losses) (7,223) (780)
Securities AFS, Fair Value 66,215 94,323
Municipal securities.    
Securities HTM:    
Securities HTM, Amortized Cost 586,272 471,533
Securities HTM, Gross Unrealized Gains 5,292 49,715
Securities HTM, Gross Unrealized (Losses) (56,978)  
Securities HTM, Fair Value 534,586 521,248
Allowance for credit losses HTM securities 180 198
Securities AFS:    
Securities AFS, Amortized Cost 239,812 163,253
Securities AFS, Gross Unrealized Gains 66 5,228
Securities AFS, Gross Unrealized (Losses) (46,700) (215)
Securities AFS, Fair Value 193,178 168,266
Asset-backed securities    
Securities AFS:    
Securities AFS, Amortized Cost 18,885 26,372
Securities AFS, Gross Unrealized Gains 48 752
Securities AFS, Gross Unrealized (Losses) (205)  
Securities AFS, Fair Value 18,728 27,124
Other securities    
Securities HTM:    
Securities HTM, Amortized Cost 1,050 1,050
Securities HTM, Gross Unrealized (Losses)   (1)
Securities HTM, Fair Value 1,050 1,049
Securities AFS:    
Securities AFS, Amortized Cost 48,631 24,568
Securities AFS, Gross Unrealized Gains 27 251
Securities AFS, Gross Unrealized (Losses) (2,800) (30)
Securities AFS, Fair Value $ 45,858 $ 24,789