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Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Securities HTM:
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 1,662
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,658
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	35,992
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	36,621
Securities held to maturity, due after five years, amortized cost	798,406
Securities held to maturity, due after five years, fair value	762,304
Securities HTM, Amortized cost	836,060	$ 683,707
Securities held to maturity, fair value	800,583	680,279
Securities AFS:
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	6,804
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	6,802
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	19,170
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	18,253
Securities available for sale, due after five years, amortized cost	240,669
Securities available for sale, due after five years, fair value	196,788
Securities available for sale, single maturity, amortized cost	266,643
Securities available for sale, single maturity, fair value	221,843
Securities AFS, Amortized Cost	331,337	348,633
Available-for-sale Securities, Debt Securities, Total	281,109	299,655
Callable Securities
Securities HTM:
Securities held to maturity, callable, amortized cost	313,154
Securities held to maturity, callable, fair value	309,034
Securities AFS:
Securities AFS, Amortized Cost	242,142
Available-for-sale Securities, Debt Securities, Total	199,875
Municipal securities
Securities HTM:
Securities HTM, Amortized cost	806,992	682,657
Securities held to maturity, fair value	766,866	679,201
Securities AFS:
Securities AFS, Amortized Cost	204,664	206,566
Available-for-sale Securities, Debt Securities, Total	164,575	170,987
Municipal securities | Callable Securities
Securities HTM:
Securities held to maturity, callable, amortized cost	285,136
Securities held to maturity, callable, fair value	276,359
Municipal securities | Callable Securities | Callable Securities
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	204,238
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	164,163
Corporate securities
Securities HTM:
Securities HTM, Amortized cost	28,018
Securities held to maturity, fair value	32,675
Securities AFS:
Securities AFS, Amortized Cost	38,866	44,239
Available-for-sale Securities, Debt Securities, Total	36,677	39,076
Corporate securities | Callable Securities
Securities HTM:
Securities held to maturity, callable, amortized cost	28,018
Securities held to maturity, callable, fair value	32,675
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	9,053	15,261
Available-for-sale Securities, Debt Securities, Total	9,224	15,423
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	9,053
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	9,224
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	55,641	65,168
Available-for-sale Securities, Debt Securities, Total	50,042	59,196
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	55,641
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	50,042
Other securities
Securities HTM:
Securities HTM, Amortized cost	1,050	1,050
Securities held to maturity, fair value	1,042	$ 1,078
Other securities | Callable Securities
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	37,904
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	$ 35,712

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