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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		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Loans originated in current year	$ 1,853,534		$ 1,853,534		$ 3,724,618
Loans originated year prior	3,549,504		3,549,504		3,581,730
Loans originated three years prior	3,240,852		3,240,852		3,052,314
Loans originated four years prior	2,724,382		2,724,382		1,588,314
Loans originated five years prior	1,414,484		1,414,484		1,686,965
Total, Loans Amortized Cost Basis by Origination Year Prior	4,387,080		4,387,080		3,571,544
Total, Revolving Loans	2,167,831		2,167,831		2,306,710
Total, Revolving Converted to Term Loans	25,421		25,421		25,225
Total loans	19,363,088		19,363,088		19,537,420
Loans originated in current year, write offs			98		0
Loans originated year prior, write offs			672		992
Loans originated three years prior, write offs			575		1,520
Loans originated four years prior, write offs			8,283		384
Loans originated five years prior, write offs			257		4,641
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			2,046		14,429
Total, Revolving Loans Write Offs			2,994		1,520
Total, Revolving Converted to Term Loans, Write Offs			3		0
YTD gross write-offs	4,478	$ 7,483	14,928	$ 17,873	23,486
Total loans	19,363,088		19,363,088		19,537,420
Commercial Portfolio Segment [Member]
Loans originated in current year	293,032		293,032		387,945
Loans originated year prior	342,882		342,882		329,467
Loans originated three years prior	225,664		225,664		345,104
Loans originated four years prior	252,617		252,617		122,567
Loans originated five years prior	76,078		76,078		76,044
Total, Loans Amortized Cost Basis by Origination Year Prior	126,699		126,699		141,937
Total, Revolving Loans	1,778,248		1,778,248		1,890,712
Total, Revolving Converted to Term Loans	8,358		8,358		8,424
Total loans	3,103,578		3,103,578		3,302,200
Loans originated in current year, write offs			98		0
Loans originated year prior, write offs			672		977
Loans originated three years prior, write offs			568		1,312
Loans originated four years prior, write offs			8,224		384
Loans originated five years prior, write offs			257		3,672
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs			49		6,044
Total, Revolving Loans Write Offs			2,994		1,520
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	2,666	6,254	12,862	12,517	13,909
Total loans	3,103,578		3,103,578		3,302,200
Commercial Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	292,982		292,982		381,705
Loans originated year prior	336,678		336,678		323,939
Loans originated three years prior	210,436		210,436		326,650
Loans originated four years prior	231,446		231,446		96,725
Loans originated five years prior	53,253		53,253		75,281
Total, Loans Amortized Cost Basis by Origination Year Prior	115,534		115,534		136,162
Total, Revolving Loans	1,648,578		1,648,578		1,775,162
Total, Revolving Converted to Term Loans	7,968		7,968		8,308
Total loans	2,896,875		2,896,875		3,123,932
Total loans	2,896,875		2,896,875		3,123,932
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0		4,488
Loans originated year prior	0		0		4,875
Loans originated three years prior	665		665		8,559
Loans originated four years prior	9,725		9,725		23,380
Loans originated five years prior	310		310		0
Total, Loans Amortized Cost Basis by Origination Year Prior	4,848		4,848		0
Total, Revolving Loans	54,180		54,180		75,419
Total, Revolving Converted to Term Loans	0		0		0
Total loans	69,728		69,728		116,721
Total loans	69,728		69,728		116,721
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	50		50		1,752
Loans originated year prior	6,204		6,204		653
Loans originated three years prior	14,563		14,563		9,895
Loans originated four years prior	6,790		6,790		2,462
Loans originated five years prior	22,515		22,515		763
Total, Loans Amortized Cost Basis by Origination Year Prior	6,317		6,317		5,775
Total, Revolving Loans	75,490		75,490		40,131
Total, Revolving Converted to Term Loans	390		390		116
Total loans	132,319		132,319		61,547
Total loans	132,319		132,319		61,547
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans originated in current year	0		0
Loans originated year prior	0		0
Loans originated three years prior	0		0
Loans originated four years prior	4,656		4,656
Loans originated five years prior	0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	4,656		4,656
Total loans	4,656		4,656
Real Estate Construction Portfolio Segment [Member]
Loans originated in current year	8,369		8,369		31,461
Loans originated year prior	54,971		54,971		131,984
Loans originated three years prior	124,922		124,922		165,684
Loans originated four years prior	90,612		90,612		44,850
Loans originated five years prior	16,917		16,917		21,034
Total, Loans Amortized Cost Basis by Origination Year Prior	10,482		10,482		26,129
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	306,273		306,273		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	306,273		306,273		421,142
Real Estate Construction Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	8,369		8,369		29,550
Loans originated year prior	51,004		51,004		131,984
Loans originated three years prior	121,425		121,425		153,977
Loans originated four years prior	55,043		55,043		19,461
Loans originated five years prior	2,596		2,596		13,298
Total, Loans Amortized Cost Basis by Origination Year Prior	10,482		10,482		3,131
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	248,919		248,919		351,401
Total loans	248,919		248,919		351,401
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0		1,911
Loans originated year prior	0		0		0
Loans originated three years prior	0		0		11,707
Loans originated four years prior	35,569		35,569		25,389
Loans originated five years prior	14,321		14,321		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	49,890		49,890		62,005
Total loans	49,890		49,890		62,005
Real Estate Construction Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		0
Loans originated year prior	3,967		3,967		0
Loans originated three years prior	3,497		3,497		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	0		0		0
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	7,464		7,464		7,736
Total loans	7,464		7,464		7,736
Commercial Real Estate Portfolio Segment [Member]
Loans originated in current year	1,034,899		1,034,899		2,159,093
Loans originated year prior	2,106,792		2,106,792		1,990,019
Loans originated three years prior	1,837,755		1,837,755		1,635,585
Loans originated four years prior	1,557,904		1,557,904		893,972
Loans originated five years prior	847,169		847,169		1,047,548
Total, Loans Amortized Cost Basis by Origination Year Prior	2,404,356		2,404,356		1,809,430
Total, Revolving Loans	179,011		179,011		185,985
Total, Revolving Converted to Term Loans	0		0		0
Total loans	9,967,886		9,967,886		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			1,997		4,164
Total, Revolving Loans Write Offs			0		0
Total, Revolving Converted to Term Loans, Write Offs			0		0
YTD gross write-offs	1,746	1,221	1,997	5,341	5,341
Total loans	9,967,886		9,967,886		9,721,632
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	1,032,804		1,032,804		2,121,489
Loans originated year prior	2,084,411		2,084,411		1,959,239
Loans originated three years prior	1,788,747		1,788,747		1,585,010
Loans originated four years prior	1,489,868		1,489,868		887,508
Loans originated five years prior	823,095		823,095		1,019,952
Total, Loans Amortized Cost Basis by Origination Year Prior	2,293,030		2,293,030		1,726,015
Total, Revolving Loans	168,887		168,887		184,601
Total, Revolving Converted to Term Loans	0		0		0
Total loans	9,680,842		9,680,842		9,483,814
Total loans	9,680,842		9,680,842		9,483,814
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	2,095		2,095		37,604
Loans originated year prior	0		0		18,910
Loans originated three years prior	19,859		19,859		38,405
Loans originated four years prior	18,601		18,601		3,499
Loans originated five years prior	17,221		17,221		10,303
Total, Loans Amortized Cost Basis by Origination Year Prior	23,405		23,405		17,210
Total, Revolving Loans	565		565		1,384
Total, Revolving Converted to Term Loans	0		0		0
Total loans	81,746		81,746		127,315
Total loans	81,746		81,746		127,315
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0		0
Loans originated year prior	22,381		22,381		11,870
Loans originated three years prior	29,149		29,149		12,170
Loans originated four years prior	49,435		49,435		2,965
Loans originated five years prior	6,853		6,853		17,293
Total, Loans Amortized Cost Basis by Origination Year Prior	87,921		87,921		66,205
Total, Revolving Loans	9,559		9,559		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	205,298		205,298		110,503
Total loans	205,298		205,298		110,503
Residential Portfolio Segment [Member]
Loans originated in current year	511,880		511,880		1,141,005
Loans originated year prior	1,043,510		1,043,510		1,129,178
Loans originated three years prior	1,052,328		1,052,328		905,938
Loans originated four years prior	823,249		823,249		526,925
Loans originated five years prior	474,320		474,320		542,339
Total, Loans Amortized Cost Basis by Origination Year Prior	1,845,543		1,845,543		1,594,048
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	5,750,830		5,750,830		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			59		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			59		0
Total loans	5,750,830		5,750,830		5,839,433
Residential Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	511,483		511,483		1,140,998
Loans originated year prior	1,041,679		1,041,679		1,128,526
Loans originated three years prior	1,046,124		1,046,124		902,613
Loans originated four years prior	818,090		818,090		524,315
Loans originated five years prior	469,840		469,840		541,005
Total, Loans Amortized Cost Basis by Origination Year Prior	1,831,283		1,831,283		1,583,118
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	5,718,499		5,718,499		5,820,575
Total loans	5,718,499		5,718,499		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	1,592		1,592		1,619
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	1,625		1,625		1,652
Total loans	1,625		1,625		1,652
Residential Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	397		397		7
Loans originated year prior	1,831		1,831		652
Loans originated three years prior	6,204		6,204		3,325
Loans originated four years prior	5,159		5,159		2,577
Loans originated five years prior	4,447		4,447		1,334
Total, Loans Amortized Cost Basis by Origination Year Prior	12,668		12,668		9,311
Total, Revolving Loans	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	30,706		30,706		17,206
Total loans	30,706		30,706		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	77		77		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	210,572		210,572		230,013
Total, Revolving Converted to Term Loans	17,063		17,063		16,801
Total loans	227,712		227,712		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	227,712		227,712		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	77		77		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	208,885		208,885		227,502
Total, Revolving Converted to Term Loans	16,732		16,732		16,628
Total loans	225,694		225,694		244,228
Total loans	225,694		225,694		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	1,687		1,687		2,511
Total, Revolving Converted to Term Loans	331		331		173
Total loans	2,018		2,018		2,684
Total loans	2,018		2,018		2,684
Installment and Other Loans [Member ]
Loans originated in current year	5,354		5,354		5,114
Loans originated year prior	1,349		1,349		981
Loans originated three years prior	106		106		3
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	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	6,809		6,809		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			7		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	7	$ 8	7	$ 15	15
Total loans	6,809		6,809		6,098
Installment and Other Loans [Member ] | Pass [Member]
Loans originated in current year	5,354		5,354		5,114
Loans originated year prior	1,349		1,349		981
Loans originated three years prior	106		106		3
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	0		0		0
Total, Revolving Converted to Term Loans	0		0		0
Total loans	6,809		6,809		6,098
Total loans	$ 6,809		$ 6,809		$ 6,098

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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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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-Topic 326
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- Definition

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

+ References

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