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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jul. 31, 2024	Dec. 31, 2023
Securities available for sale, amortized cost, due in one year or less	$ 66,207
Securities available for sale, fair value, due in one year or less	65,002
Securities held to maturity, amortized cost, due in one year or less	0
Securities held to maturity, fair value, due in one year or less	0
Securities available for sale, amortized cost, due after one year through five years	102,640
Securities available for sale, fair value, due after one year through five years	97,603
Securities held to maturity, amortized cost, due after one year through five years	0
Securities held to maturity, fair value, due after one year through five years	0
Securities available for sale, amortized cost, due after five years through ten years	59,559
Securities available for sale, fair value, due after five years through ten years	53,501
Securities held to maturity, amortized cost, due after five years through ten years	2,000
Securities held to maturity, fair value, due after five years through ten years	1,324
Securities available for sale, amortized cost, due after ten years	66,413
Securities available for sale, fair value, due after ten years	57,678
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,267
Securities available for sale, amortized cost, single maturity	294,819
Securities available for sale, fair value, single maturity	273,784
Securities held to maturity, amortized cost, single maturity	7,000
Securities held to maturity, fair value, single maturity	4,591
Mortgage-backed securities and CMO, amortized cost	124,116
Mortgage-backed securities and CMO, fair value	115,459
Mortgage-backed securities and CMO, amortized cost	0
Mortgage-backed securities and CMO, fair value	0
Securities available for sale, amortized cost	418,935		$ 468,549
Securities available for sale, fair value	389,243		437,271
Securities held to maturity, amortized cost	7,000	$ 2,000	7,000
Securities held to maturity, fair value	$ 4,591		$ 4,446

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