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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		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Loans originated in current year	$ 605,148		$ 2,545,564
Loans originated year prior	2,459,424		3,349,730
Loans originated three years prior	3,285,017		3,168,851
Loans originated four years prior	3,052,263		2,593,759
Loans originated five years prior	2,515,499		1,364,973
Total, Loans Amortized Cost Basis by Origination Year Prior	5,142,546		4,069,831
Total, Revolving Loans	2,252,671		2,248,231
Total, Revolving Converted to Term Loans	28,778		24,475
Total loans	19,341,346		19,365,414
Loans originated in current year, write offs	0		188
Loans originated year prior, write offs	20		1,586
Loans originated three years prior, write offs	42		3,166
Loans originated four years prior, write offs	163		9,009
Loans originated five years prior, write offs	2,119		553
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0		4,237
Total, Revolving Loans Write Offs	0		12,733
Total, Revolving Converted to Term Loans, Write Offs	0		0
YTD gross write-offs	2,344	$ 2,193	31,472
Total loans	19,341,346		19,365,414
Commercial Portfolio Segment [Member]
Loans originated in current year	63,767		402,743
Loans originated year prior	330,063		259,797
Loans originated three years prior	247,964		216,034
Loans originated four years prior	179,510		211,728
Loans originated five years prior	193,124		58,833
Total, Loans Amortized Cost Basis by Origination Year Prior	151,807		102,119
Total, Revolving Loans	1,825,018		1,835,445
Total, Revolving Converted to Term Loans	8,268		8,026
Total loans	2,999,521		3,094,725
Loans originated in current year, write offs	0		188
Loans originated year prior, write offs	20		1,586
Loans originated three years prior, write offs	42		3,151
Loans originated four years prior, write offs	163		8,950
Loans originated five years prior, write offs	2,119		257
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0		64
Total, Revolving Loans Write Offs	0		12,730
Total, Revolving Converted to Term Loans, Write Offs	0		0
YTD gross write-offs	2,344	1,939	26,926
Total loans	2,999,521		3,094,725
Commercial Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	63,767		400,836
Loans originated year prior	330,063		237,303
Loans originated three years prior	225,877		203,190
Loans originated four years prior	165,477		201,837
Loans originated five years prior	189,361		27,359
Total, Loans Amortized Cost Basis by Origination Year Prior	111,102		90,724
Total, Revolving Loans	1,653,632		1,675,260
Total, Revolving Converted to Term Loans	7,519		7,804
Total loans	2,746,798		2,844,313
Total loans	2,746,798		2,844,313
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0
Loans originated year prior	0		17,424
Loans originated three years prior	17,017		740
Loans originated four years prior	3,473		0
Loans originated five years prior	0		9,117
Total, Loans Amortized Cost Basis by Origination Year Prior	12,573		5,139
Total, Revolving Loans	110,287		92,632
Total, Revolving Converted to Term Loans	0		0
Total loans	143,350		125,052
Total loans	143,350		125,052
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		50
Loans originated year prior	0		5,070
Loans originated three years prior	5,070		12,104
Loans originated four years prior	10,560		6,773
Loans originated five years prior	3,763		22,357
Total, Loans Amortized Cost Basis by Origination Year Prior	28,132		6,256
Total, Revolving Loans	61,099		67,553
Total, Revolving Converted to Term Loans	749		222
Total loans	109,373		120,385
Total loans	109,373		120,385
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans originated in current year			1,857
Loans originated year prior			0
Loans originated three years prior			0
Loans originated four years prior			3,118
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			4,975
Total loans			4,975
Real Estate Construction Portfolio Segment [Member]
Loans originated in current year	6,121		22,562
Loans originated year prior	33,786		60,065
Loans originated three years prior	61,199		126,200
Loans originated four years prior	122,648		93,115
Loans originated five years prior	92,360		16,858
Total, Loans Amortized Cost Basis by Origination Year Prior	14,819		0
Total, Revolving Loans	886		0
Total, Revolving Converted to Term Loans	0		0
Total loans	331,819		318,800
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)	0
Total loans	331,819		318,800
Real Estate Construction Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	6,121		22,562
Loans originated year prior	33,786		55,835
Loans originated three years prior	56,969		126,200
Loans originated four years prior	120,548		57,546
Loans originated five years prior	59,450		3,021
Total, Loans Amortized Cost Basis by Origination Year Prior	3,113		0
Total, Revolving Loans	886		0
Total, Revolving Converted to Term Loans	0		0
Total loans	280,873		265,164
Total loans	280,873		265,164
Real Estate Construction Portfolio Segment [Member] | Special Mention [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	2,100		35,569
Loans originated five years prior	32,910		13,837
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	35,010		49,406
Total loans	35,010		49,406
Real Estate Construction Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0
Loans originated year prior	0		4,230
Loans originated three years prior	4,230		0
Loans originated four years prior	0		0
Loans originated five years prior	0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	11,706		0
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	15,936		4,230
Total loans	15,936		4,230
Commercial Real Estate Portfolio Segment [Member]
Loans originated in current year	382,236		1,472,030
Loans originated year prior	1,484,543		2,006,936
Loans originated three years prior	1,990,115		1,807,297
Loans originated four years prior	1,752,788		1,502,515
Loans originated five years prior	1,467,260		832,435
Total, Loans Amortized Cost Basis by Origination Year Prior	2,860,216		2,206,768
Total, Revolving Loans	212,179		198,485
Total, Revolving Converted to Term Loans	3,200		0
Total loans	10,152,537		10,026,466
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		296
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0		4,173
Total, Revolving Loans Write Offs	0		0
Total, Revolving Converted to Term Loans, Write Offs	0		0
YTD gross write-offs	0	251	4,469
Total loans	10,152,537		10,026,466
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	362,249		1,463,225
Loans originated year prior	1,482,810		1,987,280
Loans originated three years prior	1,971,002		1,724,563
Loans originated four years prior	1,679,321		1,428,124
Loans originated five years prior	1,393,421		800,645
Total, Loans Amortized Cost Basis by Origination Year Prior	2,740,738		2,108,143
Total, Revolving Loans	187,137		180,394
Total, Revolving Converted to Term Loans	0		0
Total loans	9,816,678		9,692,374
Total loans	9,816,678		9,692,374
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	19,987		8,805
Loans originated year prior	1,733		8,292
Loans originated three years prior	7,765		28,465
Loans originated four years prior	19,437		16,462
Loans originated five years prior	11,420		24,844
Total, Loans Amortized Cost Basis by Origination Year Prior	30,248		19,888
Total, Revolving Loans	19,201		9,939
Total, Revolving Converted to Term Loans	0		0
Total loans	109,791		116,695
Total loans	109,791		116,695
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	0		0
Loans originated year prior	0		11,364
Loans originated three years prior	11,348		54,269
Loans originated four years prior	54,030		57,929
Loans originated five years prior	62,419		6,946
Total, Loans Amortized Cost Basis by Origination Year Prior	89,230		78,737
Total, Revolving Loans	5,841		8,152
Total, Revolving Converted to Term Loans	3,200		0
Total loans	226,068		217,397
Total loans	226,068		217,397
Residential Portfolio Segment [Member]
Loans originated in current year	153,024		642,965
Loans originated year prior	611,032		1,022,932
Loans originated three years prior	985,739		1,019,204
Loans originated four years prior	996,463		786,401
Loans originated five years prior	762,755		456,847
Total, Loans Amortized Cost Basis by Origination Year Prior	2,115,704		1,760,944
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	5,624,717		5,689,293
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		59
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		59
Total loans	5,624,717		5,689,293
Residential Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	152,995		642,568
Loans originated year prior	609,493		1,020,419
Loans originated three years prior	983,090		1,014,842
Loans originated four years prior	988,664		781,218
Loans originated five years prior	758,304		452,623
Total, Loans Amortized Cost Basis by Origination Year Prior	2,094,351		1,745,923
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	5,586,897		5,657,593
Total loans	5,586,897		5,657,593
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year	0		0
Loans originated year prior	498		0
Loans originated three years prior	375		0
Loans originated four years prior	3,027		0
Loans originated five years prior	831		33
Total, Loans Amortized Cost Basis by Origination Year Prior	7,254		1,585
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	11,985		1,618
Total loans	11,985		1,618
Residential Portfolio Segment [Member] | Substandard [Member]
Loans originated in current year	29		397
Loans originated year prior	1,041		2,513
Loans originated three years prior	2,274		4,362
Loans originated four years prior	4,772		5,183
Loans originated five years prior	3,620		4,191
Total, Loans Amortized Cost Basis by Origination Year Prior	14,099		13,436
Total, Revolving Loans	0		0
Total, Revolving Converted to Term Loans	0		0
Total loans	25,835		30,082
Total loans	25,835		30,082
Equity Lines Portfolio Segment [Member]
Loans originated in current year	0		0
Loans originated year prior	0		0
Loans originated three years prior	0		72
Loans originated four years prior	0		0
Loans originated five years prior	0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0
Total, Revolving Loans	214,588		214,301
Total, Revolving Converted to Term Loans	17,310		16,449
Total loans	231,898		230,822
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		3
Total, Revolving Converted to Term Loans, Write Offs	0		0
YTD gross write-offs	0		3
Total loans	231,898		230,822
Equity Lines Portfolio Segment [Member] | Pass [Member]
Loans originated in current year	0		0
Loans originated year prior	0		0
Loans originated three years prior	0		72
Loans originated four years prior	0		0
Loans originated five years prior	0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0
Total, Revolving Loans	211,828		211,374
Total, Revolving Converted to Term Loans	17,163		16,277
Total loans	228,991		227,723
Total loans	228,991		227,723
Equity Lines Portfolio Segment [Member] | Special Mention [Member]
Loans originated in current year			0
Loans originated year prior			0
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			11
Total loans			11
Total loans			11
Equity Lines Portfolio Segment [Member] | Substandard [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	0		0
Loans originated five years prior	0		0
Total, Loans Amortized Cost Basis by Origination Year Prior	0		0
Total, Revolving Loans	2,760		2,927
Total, Revolving Converted to Term Loans	147		161
Total loans	2,907		3,088
Total loans	2,907		3,088
Installment and Other Loans [Member ]
Loans originated in current year	0		5,264
Loans originated year prior	0		0
Loans originated three years prior	0		44
Loans originated four years prior	854		0
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	854		5,308
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		15
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)	15
Total loans	854		5,308
Installment and Other Loans [Member ] | Pass [Member]
Loans originated in current year	0		5,264
Loans originated year prior	0		0
Loans originated three years prior	0		44
Loans originated four years prior	854		0
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	854		5,308
Total loans	$ 854		$ 5,308

X

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

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

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

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

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Amount of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

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- Definition

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

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

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- Definition

Amortized cost of financing receivable that can be withdrawn, repaid, and redrawn.

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