Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,092,724	$ 1,144,617
Derivative	12,628	10,727
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	133,575	143,626
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale	712,712	752,738
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	126,780	127,599
Other Debt Obligations [Member]
Securities available-for-sale	3,440	5,615
Fair Value, Recurring [Member]
Securities available-for-sale	1,092,724	1,144,617
Mortgage loans held for sale	7,069	2,606
Interest rate swap assets	9,717	10,727
Total assets	1,109,955	1,158,134
Interest rate swap liabilities	9,726	10,737
Fair Value, Recurring [Member] | Rate Lock Loan Commitments [Member]
Derivative	364	137
Fair Value, Recurring [Member] | Mandatory Forward Contract [Member]
Derivative	81	47
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	116,217	115,039
Mortgage loans held for sale	0	0
Interest rate swap assets	0	0
Total assets	116,217	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	976,507	1,029,578
Mortgage loans held for sale	7,069	2,606
Interest rate swap assets	12,628	10,727
Total assets	996,649	1,043,095
Interest rate swap liabilities	9,726	10,737
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Rate Lock Loan Commitments [Member]
Derivative	364	137
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mandatory Forward Contract [Member]
Derivative	81	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	116,217	115,039
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	116,217	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	133,575	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	133,575	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	712,712	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	712,712	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	126,780	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	126,780	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	3,440	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	3,440	5,615
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0