Note 5 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Originated Current Fiscal Year		$ 1,085,892	$ 2,134,128
Originated One Year Prior		2,000,778	637,882
Originated Two Years Prior		515,946	517,603
Originated Three Years Prior		449,697	574,284
Originated Four Years Prior		511,126	639,093
Originated Five or More Years Prior		1,451,098	1,103,926
Revolving Loans		1,267,886	1,231,435
Loans and Leases Receivable, Gross		7,282,423	6,838,351
Pass [Member]
Originated Current Fiscal Year		1,078,463	2,131,990
Originated One Year Prior		1,998,671	628,843
Originated Two Years Prior		511,446	511,755
Originated Three Years Prior		433,673	540,362
Originated Four Years Prior		479,257	623,860
Originated Five or More Years Prior		1,350,837	995,049
Revolving Loans		1,216,312	1,176,772
Loans and Leases Receivable, Gross		7,068,659	6,608,631
Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		3,328	0
Originated Four Years Prior		0	5,493
Originated Five or More Years Prior		60,002	54,483
Revolving Loans		18,780	12,310
Loans and Leases Receivable, Gross		82,110	72,286
Substandard [Member]
Originated Current Fiscal Year		7,429	2,138
Originated One Year Prior		2,107	9,039
Originated Two Years Prior		4,500	5,848
Originated Three Years Prior		12,696	33,922
Originated Four Years Prior		31,869	9,740
Originated Five or More Years Prior		40,259	54,394
Revolving Loans		32,794	42,353
Loans and Leases Receivable, Gross		131,654	157,434
Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Commercial Portfolio Segment [Member]
Originated Current Fiscal Year		176,390	403,373
Originated One Year Prior		345,477	58,534
Originated Two Years Prior		52,681	56,327
Originated Three Years Prior		34,279	73,707
Originated Four Years Prior		63,256	105,468
Originated Five or More Years Prior		195,112	111,625
Revolving Loans		487,430	490,394
Loans and Leases Receivable, Gross	[1]	1,354,625	1,299,428
Commercial Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year		168,961	403,203
Originated One Year Prior		345,319	58,534
Originated Two Years Prior		52,681	54,485
Originated Three Years Prior		32,103	60,409
Originated Four Years Prior		51,661	95,727
Originated Five or More Years Prior		167,147	86,556
Revolving Loans		470,129	471,588
Loans and Leases Receivable, Gross		1,288,001	1,230,502
Commercial Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	1
Originated Five or More Years Prior		9,618	4,045
Revolving Loans		3,317	4,266
Loans and Leases Receivable, Gross		12,935	8,312
Commercial Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year		7,429	170
Originated One Year Prior		158	0
Originated Two Years Prior		0	1,842
Originated Three Years Prior		2,176	13,298
Originated Four Years Prior		11,595	9,740
Originated Five or More Years Prior		18,347	21,024
Revolving Loans		13,984	14,540
Loans and Leases Receivable, Gross		53,689	60,614
Commercial Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Commercial Real Estate Portfolio Segment [Member]
Originated Current Fiscal Year		885,508	1,694,066
Originated One Year Prior		1,621,741	542,354
Originated Two Years Prior		431,407	425,001
Originated Three Years Prior		387,014	472,886
Originated Four Years Prior		424,558	502,207
Originated Five or More Years Prior		1,168,061	918,790
Revolving Loans		189,093	186,286
Loans and Leases Receivable, Gross		5,107,382	4,741,590
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year		885,508	1,692,098
Originated One Year Prior		1,619,792	533,315
Originated Two Years Prior		426,907	420,995
Originated Three Years Prior		373,166	452,262
Originated Four Years Prior		404,284	497,065
Originated Five or More Years Prior		1,099,266	842,244
Revolving Loans		165,421	170,721
Loans and Leases Receivable, Gross		4,974,344	4,608,700
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		3,328	0
Originated Four Years Prior		0	5,142
Originated Five or More Years Prior		50,384	50,438
Revolving Loans		15,463	6,601
Loans and Leases Receivable, Gross		69,175	62,181
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year		0	1,968
Originated One Year Prior		1,949	9,039
Originated Two Years Prior		4,500	4,006
Originated Three Years Prior		10,520	20,624
Originated Four Years Prior		20,274	0
Originated Five or More Years Prior		18,411	26,108
Revolving Loans		8,209	8,964
Loans and Leases Receivable, Gross		63,863	70,709
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Commercial Construction Portfolio Segment [Member]
Originated Current Fiscal Year		2,454	8,018
Originated One Year Prior		7,914	7,370
Originated Two Years Prior		5,246	12,625
Originated Three Years Prior		6,508	2,600
Originated Four Years Prior		2,600	2,689
Originated Five or More Years Prior		0	0
Revolving Loans		545,067	506,876
Loans and Leases Receivable, Gross		569,789	540,178
Commercial Construction Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year		2,454	8,018
Originated One Year Prior		7,914	7,370
Originated Two Years Prior		5,246	12,625
Originated Three Years Prior		6,508	2,600
Originated Four Years Prior		2,600	2,339
Originated Five or More Years Prior		0	0
Revolving Loans		537,890	490,119
Loans and Leases Receivable, Gross		562,612	523,071
Commercial Construction Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	350
Originated Five or More Years Prior		0	0
Revolving Loans		0	1,443
Loans and Leases Receivable, Gross		0	1,793
Commercial Construction Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		7,177	15,314
Loans and Leases Receivable, Gross		7,177	15,314
Commercial Construction Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Residential Portfolio Segment [Member]
Originated Current Fiscal Year		20,431	27,081
Originated One Year Prior		25,646	29,539
Originated Two Years Prior		26,598	23,611
Originated Three Years Prior		21,895	25,070
Originated Four Years Prior		20,702	28,701
Originated Five or More Years Prior		87,923	73,511
Revolving Loans		46,184	47,756
Loans and Leases Receivable, Gross		249,379	255,269
Residential Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year		20,431	27,081
Originated One Year Prior		25,646	29,539
Originated Two Years Prior		26,598	23,611
Originated Three Years Prior		21,895	25,070
Originated Four Years Prior		20,702	28,701
Originated Five or More Years Prior		84,422	66,249
Revolving Loans		42,760	44,221
Loans and Leases Receivable, Gross		242,454	244,472
Residential Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Residential Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		3,501	7,262
Revolving Loans		3,424	3,535
Loans and Leases Receivable, Gross		6,925	10,797
Residential Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Consumer Portfolio Segment [Member]
Originated Current Fiscal Year		1,109	1,590
Originated One Year Prior		0	85
Originated Two Years Prior		14	39
Originated Three Years Prior		1	21
Originated Four Years Prior		10	28
Originated Five or More Years Prior		2	0
Revolving Loans		112	123
Loans and Leases Receivable, Gross		1,248	1,886
Consumer Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year		1,109	1,590
Originated One Year Prior		0	85
Originated Two Years Prior		14	39
Originated Three Years Prior		1	21
Originated Four Years Prior		10	28
Originated Five or More Years Prior		2	0
Revolving Loans		112	123
Loans and Leases Receivable, Gross		1,248	1,886
Consumer Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		0	0
Consumer Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year		0	0
Originated One Year Prior		0	0
Originated Two Years Prior		0	0
Originated Three Years Prior		0	0
Originated Four Years Prior		0	0
Originated Five or More Years Prior		0	0
Revolving Loans		0	0
Loans and Leases Receivable, Gross		$ 0	$ 0

[1] Included in commercial loans as of June 30, 2022 and December 31, 2021 are PPP loans of $18.0 million and $93.1 million, respectively.