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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available for sale, amortized cost, due in one year or less	$ 54,694
Securities available for sale, fair value, due in one year or less	53,517
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	196,849
Securities available for sale, fair value, due after one year through five years	181,771
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	41,689
Securities available for sale, fair value, due after five years through ten years	38,651
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	1,371
Securities available for sale, amortized cost, due after ten years	102,490
Securities available for sale, fair value, due after ten years	90,273
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,377
Securities available for sale, amortized cost, single maturity	395,722
Securities available for sale, fair value, single maturity	364,212
Securities held to maturity, amortized cost, single maturity	7,000
Securities held to maturity, fair value, single maturity	4,748
Mortgage-backed securities and CMO, amortized cost	102,434
Mortgage-backed securities and CMO, fair value	91,530
Mortgage-backed securities and CMO, amortized cost	0
Mortgage-backed securities and CMO, fair value	0
Securities available for sale, amortized cost	498,156	$ 507,466
Securities available for sale, fair value	455,742	460,819
Securities held to maturity, amortized cost	7,000	7,000
Securities held to maturity, fair value	$ 4,748	$ 5,311

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