Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Assets, fair value disclosure		$ 1,618,856		$ 1,540,447
Total Losses		6,783	$ 0	4,145	$ 1,172
Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		23,828		59,158
Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure		296,709		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		1,322,147		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		23,828		59,158
Impaired Loans [Member]
Total Losses		6,783	0	3,877	1,012
Impaired Loans [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		18,939		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		18,939		54,141
Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Total Losses		2,793	0	1,786	1,012
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		11,032		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		11,032		12,950
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Total Losses		3,990	0	2,091	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		7,907		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		7,907		32,205
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member]
Assets, fair value disclosure		0		8,978
Total Losses		0	0	0	0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure		0		0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		0		0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure		0		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	0	17
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	4,328		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]	4,328		4,328
Investments in Venture Capital [Member]
Total Losses		0	$ 0	268	$ 143
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		561		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		$ 561		$ 689

[1] Other real estate owned balance of $4.1 million in the Consolidated Balance Sheets is net of estimated disposal costs.