Note 5 - Loans and Allowance for Credit Losses - Aging of Recorded Investment (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Loans, gross		$ 3,120,952	$ 3,336,449
Non-accrual Loans	[1]	40,146	22,323
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		20,358	13,626
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		4,063	4,433
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		23,306	6,766
Financial Asset, Past Due [Member]
Loans, gross		47,727	24,825
Financial Asset, Not Past Due [Member]
Loans, gross		3,073,225	3,311,624
Commercial Real Estate Portfolio Segment [Member]
Loans, gross		1,164,210	1,312,132
Non-accrual Loans		20,330	13,189
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member]
Loans, gross		259,778	276,876
Non-accrual Loans	[1]	128	141
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		0	0
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		0	0
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		128	141
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Financial Asset, Past Due [Member]
Loans, gross		128	141
Commercial Real Estate Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		259,650	276,735
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loans, gross		1,164,210	1,312,132
Non-accrual Loans	[1]	20,330	13,189
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		16,450	558
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		0	240
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		9,800	1,191
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Loans, gross		26,250	1,989
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		1,137,960	1,310,143
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member]
Loans, gross		1,505,307	1,464,108
Non-accrual Loans	[1]	16,868	5,936
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		3,531	12,764
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		3,919	2,555
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		10,829	4,100
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member] | Financial Asset, Past Due [Member]
Loans, gross		18,279	19,419
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		1,487,028	1,444,689
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member]
Loans, gross		62
Non-accrual Loans	[1]	0
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		0
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		0
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		0
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member] | Financial Asset, Past Due [Member]
Loans, gross		0
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Mortgages Loans, Held for Sale [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		62
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Loans, gross		127,655	201,223
Non-accrual Loans	[1]	761	713
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		244	0
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		0	545
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		517	7
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, Past Due [Member]
Loans, gross		761	552
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		126,894	200,671
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member]
Loans, gross		50,420	61,411
Non-accrual Loans	[1]	2,009	2,245
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		72	150
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		129	1,017
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		2,009	1,228
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member] | Financial Asset, Past Due [Member]
Loans, gross		2,210	2,395
Commercial Portfolio Segment [Member] | Small Business Administration Agency Securities [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		48,210	59,016
Commercial Portfolio Segment [Member] | Other Loans [Member]
Loans, gross		13,582	20,699
Non-accrual Loans	[1]	50	99
Commercial Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, gross		61	154
Commercial Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, gross		15	76
Commercial Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, gross		23	99
Commercial Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Past Due [Member]
Loans, gross		99	329
Commercial Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, gross		$ 13,483	$ 20,370

[1] Included in total loans.