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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, 2022	Dec. 31, 2021
Securities available for sale, amortized cost, due in one year or less	$ 36,739
Securities available for sale, fair value, due in one year or less	35,856
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	218,647
Securities available for sale, fair value, due after one year through five years	201,651
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	42,163
Securities available for sale, fair value, due after five years through ten years	39,334
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	1,507
Securities available for sale, amortized cost, due after ten years	105,179
Securities available for sale, fair value, due after ten years	90,762
Securities held to maturity, amortized cost, due after ten years	5,000
Securities held to maturity, fair value, due after ten years	3,804
Securities available for sale, amortized cost, single maturity	402,728
Securities available for sale, fair value, single maturity	367,603
Securities held to maturity, amortized cost, single maturity	7,000
Securities held to maturity, fair value, single maturity	5,311
Mortgage-backed securities and CMO, amortized cost	104,738
Mortgage-backed securities and CMO, fair value	93,216
Mortgage-backed securities and CMO, amortized cost	0
Mortgage-backed securities and CMO, fair value	0
Securities available for sale, amortized cost	507,466	$ 445,220
Securities available for sale, fair value	460,819	447,335
Securities held to maturity, amortized cost	7,000	2,000
Securities held to maturity, fair value	$ 5,311	$ 2,004

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