Note 14 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,131,852	$ 1,144,617
Derivative	8,636	10,727
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	137,779	143,626
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale	743,455	752,738
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	128,725	127,599
Other Debt Obligations [Member]
Securities available-for-sale	5,605	5,615
Fair Value, Recurring [Member]
Securities available-for-sale	1,131,852	1,144,617
Mortgage loans held for sale	6,397	2,606
Interest rate swaps	8,636	10,727
Total assets	1,147,353	1,158,134
Interest rate swaps	8,152	10,737
Total Liabilities	8,223
Fair Value, Recurring [Member] | Rate Lock Loan Commitments [Member]
Derivative	468	137
Fair Value, Recurring [Member] | Mandatory Forward Contract [Member]
Derivative		47
Derivative liabilities	71
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	116,288	115,039
Mortgage loans held for sale	0	0
Interest rate swaps	0	0
Total assets	116,288	115,039
Interest rate swaps	0	0
Total Liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Rate Lock Loan Commitments [Member]
Derivative	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mandatory Forward Contract [Member]
Derivative		0
Derivative liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	1,015,564	1,029,578
Mortgage loans held for sale	6,397	2,606
Interest rate swaps	8,636	10,727
Total assets	1,031,065	1,043,095
Interest rate swaps	8,152	10,737
Total Liabilities	8,223
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Rate Lock Loan Commitments [Member]
Derivative	468	137
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mandatory Forward Contract [Member]
Derivative		47
Derivative liabilities	71
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Mortgage loans held for sale	0	0
Interest rate swaps	0	0
Total assets	0	0
Interest rate swaps	0	0
Total Liabilities	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Rate Lock Loan Commitments [Member]
Derivative	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mandatory Forward Contract [Member]
Derivative		0
Derivative liabilities	0
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available-for-sale	116,288	115,039
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	116,288	115,039
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	137,779	143,626
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	137,779	143,626
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale	743,455	752,738
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	743,455	752,738
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	128,725	127,599
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	128,725	127,599
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Other Debt Obligations [Member]
Securities available-for-sale	5,605	5,615
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	5,605	5,615
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0