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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale, amortized cost, due in one year or less	$ 45,936
Securities available for sale, fair value, due in one year or less	45,056
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	213,953
Securities available for sale, fair value, due after one year through five years	200,774
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	41,376
Securities available for sale, fair value, due after five years through ten years	39,120
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	1,520
Securities available for sale, amortized cost, due after ten years	105,940
Securities available for sale, fair value, due after ten years	93,887
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,776
Securities available for sale, amortized cost, single maturity	407,205
Securities available for sale, fair value, single maturity	378,837
Securities held to maturity, amortized cost, single maturity	7,000
Securities held to maturity, fair value, single maturity	5,296
Mortgage-backed securities and CMO, amortized cost	100,717
Mortgage-backed securities and CMO, fair value	91,253
Mortgage-backed securities and CMO, amortized cost	0
Mortgage-backed securities and CMO, fair value	0
Securities available for sale, amortized cost	507,922	$ 507,466
Securities available for sale, fair value	470,090	460,819
Securities held to maturity, amortized cost	7,000	7,000
Securities held to maturity, fair value	$ 5,296	$ 5,311

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