Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 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	$ 1,857
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,850
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	34,099
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	35,817
Securities held to maturity, due after five years, amortized cost	759,743
Securities held to maturity, due after five years, fair value	753,992
Securities HTM, Amortized cost	795,699	$ 683,707
Securities held to maturity, fair value	791,659	680,279
Securities AFS:
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	4,148
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	4,150
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	19,034
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	18,099
Securities available for sale, due after five years, amortized cost	243,034
Securities available for sale, due after five years, fair value	205,674
Securities available for sale, single maturity, amortized cost	266,216
Securities available for sale, single maturity, fair value	227,923
Securities AFS, Amortized Cost	334,466	348,633
Available-for-sale Securities, Debt Securities, Total	291,865	299,655
Callable Securities
Securities AFS:
Securities AFS, Amortized Cost	244,205
Available-for-sale Securities, Debt Securities, Total	207,920
Municipal securities
Securities HTM:
Securities HTM, Amortized cost	794,649	682,657
Securities held to maturity, fair value	790,610	679,201
Securities AFS:
Securities AFS, Amortized Cost	204,879	206,566
Available-for-sale Securities, Debt Securities, Total	171,162	170,987
Municipal securities | Callable Securities
Securities HTM:
Securities held to maturity, callable, amortized cost	298,861
Securities held to maturity, callable, fair value	301,521
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	204,450
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	170,745
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	10,326	15,261
Available-for-sale Securities, Debt Securities, Total	10,455	15,423
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	10,326
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	10,455
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	57,924	65,168
Available-for-sale Securities, Debt Securities, Total	53,487	59,196
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	57,924
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	53,487
Other securities
Securities HTM:
Securities HTM, Amortized cost	1,050	1,050
Securities held to maturity, fair value	1,049	1,078
Securities AFS:
Securities AFS, Amortized Cost	40,715	44,239
Available-for-sale Securities, Debt Securities, Total	38,140	$ 39,076
Other securities | Callable Securities
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	39,755
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	$ 37,175