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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Securities available for sale, amortized cost, due in one year or less	$ 60,809
Securities available for sale, fair value, due in one year or less	59,782
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 in one year through five years	123,645
Securities available for sale, fair value, due in one year through five years	118,416
Securities held to maturity, amortized cost, due in one year through five years	0
Securities held to maturity, fair value, due in one year through five years	0
Securities available for sale, amortized cost, due after five years through ten years	52,663
Securities available for sale, fair value, due after five years through ten years	49,010
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	1,354
Securities available for sale, amortized cost, due after ten years	70,168
Securities available for sale, fair value, due after ten years	62,437
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,334
Securities available for sale, amortized cost, allocated and single maturity date	307,285
Securities available for sale, fair value, allocated and single maturity date	289,645
Securities held to maturity, amortized cost, allocated and single maturity date	7,000
Securities held to maturity, fair value, allocated and single maturity date	4,688
Securities available for sale, amortized cost, without single maturity date	125,120
Securities available for sale, fair value, without single maturity date	118,824
Securities held to maturity, amortized cost, without single maturity date	0
Securities held to maturity, fair value, without single maturity date	0
Securities available for sale, amortized cost	432,405	$ 468,549
Securities available for sale, fair value	408,469	437,271
Securities held to maturity, amortized cost	7,000	7,000
Securities held to maturity, fair value	$ 4,688	$ 4,446

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