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Note 19 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Equity securities, at fair value (Note 2)	$ 8,566	$ 8,492
Securities available for sale, at fair value (Note 2)	529,749	1,098,885
US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	78,204	91,979
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	229,938	534,847
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	208,563	433,115
Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	711	20,642
Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	12,333	16,294
Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	529,749	1,098,885
Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	9,204
Interest rate derivative contracts - liabilities	5,823
Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities, at fair value (Note 2)	8,566	8,492
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	78,204	91,979
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	229,938	534,847
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	208,563	433,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale, at fair value (Note 2)	711	20,642
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Securities available for sale, at fair value (Note 2)	12,333	16,294
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	78,204	91,979
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)	6,024	6,724
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	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	78,204	91,979
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 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale, at fair value (Note 2)	451,545	985,856
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Interest rate contracts	9,204
Interest rate derivative contracts - liabilities	5,823
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 and Government [Member]
Securities available for sale, at fair value (Note 2)	0	2,008
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale, at fair value (Note 2)	0	0
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)	229,938	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)	208,563	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)	711	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)	12,333	16,294
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)	2,542	1,768
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	0
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

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