Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities HTM:
Securities held to maturity, due in one year or less, amortized cost	$ 2,845
Securities held to maturity, due in one year or less, fair value	2,813
Securities held to maturity, due after one year through five years, amortized cost	26,584
Securities held to maturity, due after one year through five years, fair value	28,126
Securities held to maturity, due after five years, amortized cost	547,319
Securities held to maturity, due after five years, fair value	507,905
Securities HTM, Amortized cost	576,748	$ 587,322
Securities held to maturity, fair value	538,844	535,636
Securities AFS:
Securities available for sale, due in one year or less, amortized cost	5,376
Securities available for sale, Due in one year or less, fair value	5,362
Securities available for sale, due after one year through five years, amortized cost	8,607
Securities available for sale, Due after one year through five years, fair value	8,275
Securities available for sale, due after five years, amortized cost	262,236
Securities available for sale, due after five years, fair value	214,333
Securities available for sale, single maturity, amortized cost	276,219
Securities available for sale, single maturity, fair value	227,970
Securities AFS, Amortized Cost	361,607	400,511
Available-for-sale Securities, Debt Securities, Total	306,320	340,960
Callable Securities [Member]
Securities AFS:
Securities AFS, Amortized Cost	251,839
Available-for-sale Securities, Debt Securities, Total	206,265
Municipal securities.
Securities HTM:
Securities HTM, Amortized cost	575,698	586,272
Securities held to maturity, fair value	537,815	534,586
Securities AFS:
Securities AFS, Amortized Cost	208,038	239,812
Available-for-sale Securities, Debt Securities, Total	167,910	193,178
Municipal securities. | Callable Securities [Member]
Securities HTM:
Securities held to maturity, callable, amortized cost	210,513
Securities held to maturity, callable, fair value	192,465
Securities AFS:
Securities available for sale, callable, amortized cost	206,213
Securities available for sale, callable, fair value	166,107
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	17,363	18,885
Available-for-sale Securities, Debt Securities, Total	17,393	18,728
Securities available for sale, callable, amortized cost	17,363
Securities available for sale, callable, fair value	17,393
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	68,025	73,438
Available-for-sale Securities, Debt Securities, Total	60,957	66,215
Securities available for sale, callable, amortized cost	68,025
Securities available for sale, callable, fair value	60,957
Other securities
Securities HTM:
Securities HTM, Amortized cost	1,050	1,050
Securities held to maturity, fair value	1,029	1,050
Securities AFS:
Securities AFS, Amortized Cost	46,579	48,631
Available-for-sale Securities, Debt Securities, Total	41,118	$ 45,858
Other securities | Callable Securities [Member]
Securities AFS:
Securities available for sale, callable, amortized cost	45,626
Securities available for sale, callable, fair value	$ 40,158