Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets, fair value disclosure		$ 1,699,623	$ 1,540,447
Total Losses		4,296	4,145	$ 1,172
Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		27,756	59,158
Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure		535,706	262,658
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		1,163,917	1,277,739
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure		0	50
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		27,756	59,158
Impaired Loans [Member]
Total Losses		4,069	3,877	1,012
Impaired Loans [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		7,073	54,141
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		7,073	54,141
Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Total Losses		0	1,786	1,012
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		191	12,950
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		191	12,950
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Total Losses		4,069	2,091	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		6,882	32,205
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		6,882	32,205
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member]
Assets, fair value disclosure			8,978
Total Losses			0	0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure			8,978
Impaired Loans [Member] | Installment and Other Loans [Member ]
Assets, fair value disclosure			8
Total Losses			0	0
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure			8
Other Real Estate Owned [Member]
Total Losses	[1]	0	0	17
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	20,446	4,328
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	20,446	4,328
Investments in Venture Capital [Member]
Total Losses		227	268	$ 143
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		237	689
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		$ 237	$ 689

[1] Other real estate owned balance of $14.4 million in the Consolidated Balance Sheets is net of estimated disposal costs.