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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Equity securities, at fair value (Note 2)	$ 7,977	$ 8,492
Securities available for sale, at fair value (Note 2)	530,093	1,098,885
US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	77,554	91,979
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	223,987	534,847
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	214,691	433,115
Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	716	20,642
Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	13,145	16,294
US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	2,550	2,008
Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	530,093	1,098,885
Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	28,185
Interest rate derivative contracts - liabilities	5,524
Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	7,977	8,492
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	77,554	91,979
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	223,987	534,847
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	214,691	433,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	716	20,642
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	13,145	16,294
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)		2,008
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	0
Interest rate derivative contracts - liabilities	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	6,116	6,724
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	530,093	1,077,835
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	28,185
Interest rate derivative contracts - liabilities	5,524
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	77,554	91,979
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	223,987	514,797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	214,691	433,115
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	716	19,642
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	13,145	16,294
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)		2,008
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	0	21,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	0
Interest rate derivative contracts - liabilities	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	1,861	1,768
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	20,050
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	0	1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	$ 0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)		$ 0

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