Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,020,248	$ 1,144,617
Derivative	17,590	10,727
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	109,233	143,626
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale	672,666	752,738
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	116,891	127,599
Other Debt Obligations [Member]
Securities available-for-sale	3,449	5,615
Fair Value, Recurring [Member]
Securities available-for-sale	1,020,248	1,144,617
Mortgage loans held for sale	6,535	2,606
Interest rate swap assets	17,590	10,727
Total assets	1,044,685	1,158,134
Interest rate swap liabilities	11,929	10,737
Fair Value, Recurring [Member] | Rate Lock Loan Commitments [Member]
Derivative	202	137
Fair Value, Recurring [Member] | Mandatory Forward Contract [Member]
Derivative	110	47
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	118,009	115,039
Mortgage loans held for sale	0	0
Interest rate swap assets	0	0
Total assets	118,009	115,039
Interest rate swap liabilities	0	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	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	902,239	1,029,578
Mortgage loans held for sale	6,535	2,606
Interest rate swap assets	17,590	10,727
Total assets	926,676	1,043,095
Interest rate swap liabilities	11,929	10,737
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Rate Lock Loan Commitments [Member]
Derivative	202	137
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mandatory Forward Contract [Member]
Derivative	110	47
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 swap assets	0	0
Total assets	0	0
Interest rate swap liabilities	0	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	0
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available-for-sale	118,009	115,039
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	118,009	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	109,233	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	109,233	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	672,666	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	672,666	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	116,891	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	116,891	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	3,449	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	3,449	5,615
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0