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Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Securities HTM:
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 1,230
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,227
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	29,343
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	26,735
Securities held to maturity, due after five years, amortized cost	843,721
Securities held to maturity, due after five years, fair value	763,142
Securities HTM, Amortized cost	874,294	$ 836,060
Securities held to maturity, fair value	791,104	800,583
Securities AFS:
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	3,279
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	3,277
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	20,105
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	19,370
Securities available for sale, due after five years, amortized cost	238,901
Securities available for sale, due after five years, fair value	190,636
Securities available for sale, single maturity, amortized cost	262,285
Securities available for sale, single maturity, fair value	213,283
Securities AFS, Amortized Cost	317,770	331,337
Available-for-sale Securities, Debt Securities, Total	264,241	281,109
Callable Securities [Member]
Securities HTM:
Securities held to maturity, callable, amortized cost	309,893
Securities held to maturity, callable, fair value	298,863
Securities AFS:
Securities AFS, Amortized Cost	241,535
Available-for-sale Securities, Debt Securities, Total	194,695
Municipal securities
Securities HTM:
Securities HTM, Amortized cost	845,226	806,992
Securities held to maturity, fair value	757,653	766,866
Securities AFS:
Securities AFS, Amortized Cost	203,776	204,664
Available-for-sale Securities, Debt Securities, Total	158,759	164,575
Municipal securities | Callable Securities [Member]
Securities HTM:
Securities held to maturity, callable, amortized cost	281,875
Securities held to maturity, callable, fair value	266,459
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	203,630
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	158,627
Corporate securities
Securities HTM:
Securities HTM, Amortized cost	28,018	28,018
Securities held to maturity, fair value	32,405	32,675
Securities AFS:
Securities AFS, Amortized Cost	38,868	38,866
Available-for-sale Securities, Debt Securities, Total	37,037	36,677
Corporate securities | Callable Securities [Member]
Securities HTM:
Securities held to maturity, callable, amortized cost	28,018
Securities held to maturity, callable, fair value	32,404
Asset-backed securities
Securities AFS:
Securities AFS, Amortized Cost	7,644	9,053
Available-for-sale Securities, Debt Securities, Total	7,764	9,224
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	7,644
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	7,764
Residential mortgage-backed and related securities
Securities AFS:
Securities AFS, Amortized Cost	47,841	55,641
Available-for-sale Securities, Debt Securities, Total	43,194	50,042
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	47,841
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	43,194
Other securities
Securities HTM:
Securities HTM, Amortized cost	1,050	1,050
Securities held to maturity, fair value	1,046	$ 1,042
Other securities | Callable Securities [Member]
Securities AFS:
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	37,905
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	$ 36,068

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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