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Note 8 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Loans originated in current year	$ 1,314,808		$ 1,314,808		$ 3,724,618
Loans originated year prior	3,603,192		3,603,192		3,581,730
Loans originated three years prior	3,368,888		3,368,888		3,052,314
Loans originated four years prior	2,821,927		2,821,927		1,588,314
Loans originated five years prior	1,451,353		1,451,353		1,686,965
Total, Loans Amortized Cost Basis by Origination Year Prior	4,663,971		4,663,971		3,571,544
Total, Revolving Loans	2,097,131		2,097,131		2,306,710
Total, Revolving Converted to Term Loans	25,469		25,469		25,225
Total loans	19,346,739		19,346,739		19,537,420
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			401		992
Loans originated three years prior, write offs			441		1,520
Loans originated four years prior, write offs			8,096		384
Loans originated five years prior, write offs			148		4,641
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			291		14,429
Total, Revolving Loans Write Offs			1,070		1,520
Total, Revolving Converted to Term Loans, Write Offs			3		0
YTD gross write-offs	8,257	$ 2,483	10,450	$ 10,390	23,486
Total loans	19,346,739		19,346,739		19,537,420
Commercial Portfolio Segment [Member]
Loans originated in current year	283,559		283,559		387,945
Loans originated year prior	337,756		337,756		329,467
Loans originated three years prior	260,108		260,108		345,104
Loans originated four years prior	276,562		276,562		122,567
Loans originated five years prior	79,235		79,235		76,044
Total, Loans Amortized Cost Basis by Origination Year Prior	135,448		135,448		141,937
Total, Revolving Loans	1,705,371		1,705,371		1,890,712
Total, Revolving Converted to Term Loans	8,856		8,856		8,424
Total loans	3,086,895		3,086,895		3,302,200
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			401		977
Loans originated three years prior, write offs			441		1,312
Loans originated four years prior, write offs			8,096		384
Loans originated five years prior, write offs			148		3,672
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			40		6,044
Total, Revolving Loans Write Offs			1,070		1,520
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	8,257	2,352	10,196	6,263	13,909
Total loans	3,086,895		3,086,895		3,302,200
Commercial Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	282,985		282,985		381,705
Loans originated year prior	331,024		331,024		323,939
Loans originated three years prior	242,031		242,031		326,650
Loans originated four years prior	262,156		262,156		96,725
Loans originated five years prior	57,262		57,262		75,281
Total, Loans Amortized Cost Basis by Origination Year Prior	120,683		120,683		136,162
Total, Revolving Loans	1,609,154		1,609,154		1,775,162
Total, Revolving Converted to Term Loans	8,483		8,483		8,308
Total loans	2,913,778		2,913,778		3,123,932
Total loans	2,913,778		2,913,778		3,123,932
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	420		420		4,488
Loans originated year prior	246		246		4,875
Loans originated three years prior	2,749		2,749		8,559
Loans originated four years prior	14,406		14,406		23,380
Loans originated five years prior	21,973		21,973		0
Total, Loans Amortized Cost Basis by Origination Year Prior	8,359		8,359		0
Total, Revolving Loans	32,118		32,118		75,419
Total, Revolving Converted to Term Loans	0		0		0
Total loans	80,271		80,271		116,721
Total loans	80,271		80,271		116,721
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	154		154		1,752
Loans originated year prior	6,486		6,486		653
Loans originated three years prior	15,328		15,328		9,895
Loans originated four years prior	0		0		2,462
Loans originated five years prior	0		0		763
Total, Loans Amortized Cost Basis by Origination Year Prior	6,406		6,406		5,775
Total, Revolving Loans	64,099		64,099		40,131
Total, Revolving Converted to Term Loans	373		373		116
Total loans	92,846		92,846		61,547
Total loans	92,846		92,846		61,547
Real Estate Construction Portfolio Segment [Member]
Loans originated in current year	1,066		1,066		31,461
Loans originated year prior	47,101		47,101		131,984
Loans originated three years prior	136,198		136,198		165,684
Loans originated four years prior	108,623		108,623		44,850
Loans originated five years prior	26,561		26,561		21,034
Total, Loans Amortized Cost Basis by Origination Year Prior	36,618		36,618		26,129
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	356,167		356,167		421,142
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			0		0
Loans originated three years prior, write offs			0		0
Loans originated four years prior, write offs			0		0
Loans originated five years prior, write offs			0		0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			0		4,221
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	(0)	(0)	0	(0)	4,221
Total loans	356,167		356,167		421,142
Real Estate Construction Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	1,066		1,066		29,550
Loans originated year prior	43,592		43,592		131,984
Loans originated three years prior	136,198		136,198		153,977
Loans originated four years prior	77,477		77,477		19,461
Loans originated five years prior	2,564		2,564		13,298
Total, Loans Amortized Cost Basis by Origination Year Prior	13,620		13,620		3,131
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	274,517		274,517		351,401
Total loans	274,517		274,517		351,401
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0		1,911
Loans originated year prior	3,509		3,509		0
Loans originated three years prior	0		0		11,707
Loans originated four years prior	31,146		31,146		25,389
Loans originated five years prior	23,997		23,997		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		22,998
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	58,652		58,652		62,005
Total loans	58,652		58,652		62,005
Real Estate Construction Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		0
Loans originated year prior	0		0		0
Loans originated three years prior	0		0		0
Loans originated four years prior	0		0		0
Loans originated five years prior	0		0		7,736
Total, Loans Amortized Cost Basis by Origination Year Prior	22,998		22,998		0
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	22,998		22,998		7,736
Total loans	22,998		22,998		7,736
Commercial Real Estate Portfolio Segment [Member]
Loans originated in current year	686,111		686,111		2,159,093
Loans originated year prior	2,143,019		2,143,019		1,990,019
Loans originated three years prior	1,896,982		1,896,982		1,635,585
Loans originated four years prior	1,584,768		1,584,768		893,972
Loans originated five years prior	853,940		853,940		1,047,548
Total, Loans Amortized Cost Basis by Origination Year Prior	2,541,564		2,541,564		1,809,430
Total, Revolving Loans	172,267		172,267		185,985
Total, Revolving Converted to Term Loans	0		0		0
Total loans	9,878,651		9,878,651		9,721,632
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			0		0
Loans originated three years prior, write offs			0		208
Loans originated four years prior, write offs			0		0
Loans originated five years prior, write offs			0		969
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			251		4,164
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	(0)	130	251	4,120	5,341
Total loans	9,878,651		9,878,651		9,721,632
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	686,111		686,111		2,121,489
Loans originated year prior	2,120,624		2,120,624		1,959,239
Loans originated three years prior	1,851,089		1,851,089		1,585,010
Loans originated four years prior	1,529,293		1,529,293		887,508
Loans originated five years prior	847,101		847,101		1,019,952
Total, Loans Amortized Cost Basis by Origination Year Prior	2,433,709		2,433,709		1,726,015
Total, Revolving Loans	168,127		168,127		184,601
Total, Revolving Converted to Term Loans	0		0		0
Total loans	9,636,054		9,636,054		9,483,814
Total loans	9,636,054		9,636,054		9,483,814
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0		37,604
Loans originated year prior	11,210		11,210		18,910
Loans originated three years prior	15,500		15,500		38,405
Loans originated four years prior	9,249		9,249		3,499
Loans originated five years prior	1,847		1,847		10,303
Total, Loans Amortized Cost Basis by Origination Year Prior	21,528		21,528		17,210
Total, Revolving Loans	2,099		2,099		1,384
Total, Revolving Converted to Term Loans	0		0		0
Total loans	61,433		61,433		127,315
Total loans	61,433		61,433		127,315
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		0
Loans originated year prior	11,185		11,185		11,870
Loans originated three years prior	30,393		30,393		12,170
Loans originated four years prior	46,226		46,226		2,965
Loans originated five years prior	4,992		4,992		17,293
Total, Loans Amortized Cost Basis by Origination Year Prior	86,327		86,327		66,205
Total, Revolving Loans	2,041		2,041		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	181,164		181,164		110,503
Total loans	181,164		181,164		110,503
Residential Portfolio Segment [Member]
Loans originated in current year	342,901		342,901		1,141,005
Loans originated year prior	1,070,468		1,070,468		1,129,178
Loans originated three years prior	1,075,344		1,075,344		905,938
Loans originated four years prior	851,973		851,973		526,925
Loans originated five years prior	491,617		491,617		542,339
Total, Loans Amortized Cost Basis by Origination Year Prior	1,950,341		1,950,341		1,594,048
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	5,782,644		5,782,644		5,839,433
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			0		0
Loans originated three years prior, write offs			0		0
Loans originated four years prior, write offs			0		0
Loans originated five years prior, write offs			0		0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			0		0
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs			0		0
Total loans	5,782,644		5,782,644		5,839,433
Residential Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	342,901		342,901		1,140,998
Loans originated year prior	1,069,894		1,069,894		1,128,526
Loans originated three years prior	1,072,956		1,072,956		902,613
Loans originated four years prior	848,067		848,067		524,315
Loans originated five years prior	486,990		486,990		541,005
Total, Loans Amortized Cost Basis by Origination Year Prior	1,935,373		1,935,373		1,583,118
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	5,756,181		5,756,181		5,820,575
Total loans	5,756,181		5,756,181		5,820,575
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0		0
Loans originated year prior	0		0		0
Loans originated three years prior	0		0		0
Loans originated four years prior	0		0		33
Loans originated five years prior	33		33		0
Total, Loans Amortized Cost Basis by Origination Year Prior	1,598		1,598		1,619
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	1,631		1,631		1,652
Total loans	1,631		1,631		1,652
Residential Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		7
Loans originated year prior	574		574		652
Loans originated three years prior	2,388		2,388		3,325
Loans originated four years prior	3,906		3,906		2,577
Loans originated five years prior	4,594		4,594		1,334
Total, Loans Amortized Cost Basis by Origination Year Prior	13,370		13,370		9,311
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	24,832		24,832		17,206
Total loans	24,832		24,832		17,206
Equity Lines Portfolio Segment [Member]
Loans originated in current year	0		0		0
Loans originated year prior	0		0		101
Loans originated three years prior	87		87		0
Loans originated four years prior	0		0		0
Loans originated five years prior	0		0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		0
Total, Revolving Loans	219,493		219,493		230,013
Total, Revolving Converted to Term Loans	16,613		16,613		16,801
Total loans	236,193		236,193		246,915
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			0		0
Loans originated three years prior, write offs			0		0
Loans originated four years prior, write offs			0		0
Loans originated five years prior, write offs			0		0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			0		0
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			3		0
YTD gross write-offs			3		0
Total loans	236,193		236,193		246,915
Equity Lines Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	0		0		0
Loans originated year prior	0		0		98
Loans originated three years prior	87		87		0
Loans originated four years prior	0		0		0
Loans originated five years prior	0		0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		0
Total, Revolving Loans	217,511		217,511		227,502
Total, Revolving Converted to Term Loans	16,280		16,280		16,628
Total loans	233,878		233,878		244,228
Total loans	233,878		233,878		244,228
Equity Lines Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year					0
Loans originated year prior					3
Loans originated three years prior					0
Loans originated four years prior					0
Loans originated five years prior					0
Total, Loans Amortized Cost Basis by Origination Year Prior					0
Total, Revolving Loans					0
Total, Revolving Converted to Term Loans					0
Total loans					3
Total loans					3
Equity Lines Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		0
Loans originated year prior	0		0		0
Loans originated three years prior	0		0		0
Loans originated four years prior	0		0		0
Loans originated five years prior	0		0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		0
Total, Revolving Loans	1,982		1,982		2,511
Total, Revolving Converted to Term Loans	333		333		173
Total loans	2,315		2,315		2,684
Total loans	2,315		2,315		2,684
Installment and Other Loans [Member ]
Loans originated in current year	1,171		1,171		5,114
Loans originated year prior	4,848		4,848		981
Loans originated three years prior	169		169		3
Loans originated four years prior	1		1		0
Loans originated five years prior	0		0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		0
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	6,189		6,189		6,098
Loans originated in current year, write offs			0		0
Loans originated year prior, write offs			0		15
Loans originated three years prior, write offs			0		0
Loans originated four years prior, write offs			0		0
Loans originated five years prior, write offs			0		0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			0		0
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	(0)	$ 1	0	$ 7	15
Total loans	6,189		6,189		6,098
Installment and Other Loans [Member ] | Pass [Member]
Loans originated in current year	1,171		1,171		5,114
Loans originated year prior	4,848		4,848		981
Loans originated three years prior	169		169		3
Loans originated four years prior	1		1		0
Loans originated five years prior	0		0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0		0
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	6,189		6,189		6,098
Total loans	$ 6,189		$ 6,189		$ 6,098

X

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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X

- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

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- Definition

Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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