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Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities HTM:
Securities held to maturity, due in one year or less, amortized cost	$ 1,912
Securities held to maturity, due in one year or less, fair value	1,893
Securities held to maturity, due after one year through five years, amortized cost	21,605
Securities held to maturity, due after one year through five years, fair value	22,436
Securities held to maturity, due after five years, amortized cost	697,311
Securities held to maturity, due after five years, fair value	672,118
Securities HTM, Amortized cost	720,828	$ 683,707
Securities held to maturity, fair value	696,447	680,279
Securities AFS:
Securities available for sale, due in one year or less, amortized cost	6,298
Securities available for sale, Due in one year or less, fair value	6,293
Securities available for sale, due after one year through five years, amortized cost	19,044
Securities available for sale, Due after one year through five years, fair value	17,849
Securities available for sale, due after five years, amortized cost	243,430
Securities available for sale, due after five years, fair value	198,641
Securities available for sale, single maturity, amortized cost	268,772
Securities available for sale, single maturity, fair value	222,783
Securities AFS, Amortized Cost	342,238	348,633
Available-for-sale Securities, Debt Securities, Total	290,212	299,655
Callable Securities
Securities AFS:
Securities AFS, Amortized Cost	244,417
Available-for-sale Securities, Debt Securities, Total	201,050
Municipal securities
Securities HTM:
Securities HTM, Amortized cost	719,778	682,657
Securities held to maturity, fair value	695,414	679,201
Securities AFS:
Securities AFS, Amortized Cost	205,340	206,566
Available-for-sale Securities, Debt Securities, Total	165,268	170,987
Municipal securities | Callable Securities
Securities HTM:
Securities held to maturity, callable, amortized cost	249,059
Securities held to maturity, callable, fair value	246,233
Securities AFS:
Securities available for sale, callable, amortized cost	204,660
Securities available for sale, callable, fair value	164,606
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	12,516	15,261
Available-for-sale Securities, Debt Securities, Total	12,721	15,423
Securities available for sale, callable, amortized cost	12,516
Securities available for sale, callable, fair value	12,721
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	60,950	65,168
Available-for-sale Securities, Debt Securities, Total	54,708	59,196
Securities available for sale, callable, amortized cost	60,950
Securities available for sale, callable, fair value	54,708
Other securities
Securities HTM:
Securities HTM, Amortized cost	1,050	1,050
Securities held to maturity, fair value	1,033	1,078
Securities AFS:
Securities AFS, Amortized Cost	40,715	44,239
Available-for-sale Securities, Debt Securities, Total	37,414	$ 39,076
Other securities | Callable Securities
Securities AFS:
Securities available for sale, callable, amortized cost	39,757
Securities available for sale, callable, fair value	$ 36,444

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