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Note 6 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (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
Originated Current Fiscal Year	$ 220,908		$ 220,908		$ 444,378
Originated One Year Prior	444,533		444,533		1,873,427
Originated Two Years Prior	1,777,219		1,777,219		1,891,130
Originated Three Years Prior	1,844,135		1,844,135		419,300
Originated Four Years Prior	410,836		410,836		389,442
Originated Five or More Years Prior	1,746,233		1,746,233		1,497,749
Revolving Loans	1,672,468		1,672,468		1,836,415
Gross loans	8,116,332		8,116,332		8,351,841
Gross write-off, current year			0		54
Gross write-off, one year prior			0		3,397
Gross write-off, two years prior			0		0
Gross write-off, three years prior			48		0
Gross write-off, four years prior			0		280
Gross write-off, five years prior			8,373		13,236
Gross write-off, revolving			1,918		82
Gross write-off	3,559	$ 2,487	10,339	$ 8,089	17,049
Pass [Member]
Originated Current Fiscal Year	220,908		220,908		444,128
Originated One Year Prior	444,283		444,283		1,862,368
Originated Two Years Prior	1,764,918		1,764,918		1,888,446
Originated Three Years Prior	1,838,848		1,838,848		419,299
Originated Four Years Prior	406,372		406,372		387,013
Originated Five or More Years Prior	1,621,442		1,621,442		1,435,499
Revolving Loans	1,638,701		1,638,701		1,802,411
Gross loans	7,935,472		7,935,472		8,239,164
Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		10,620
Originated Two Years Prior	10,854		10,854		0
Originated Three Years Prior	2,675		2,675		0
Originated Four Years Prior	1,527		1,527		562
Originated Five or More Years Prior	74,946		74,946		28,270
Revolving Loans	30,627		30,627		14,716
Gross loans	120,629		120,629		54,168
Substandard [Member]
Originated Current Fiscal Year	0		0		250
Originated One Year Prior	250		250		439
Originated Two Years Prior	1,447		1,447		2,684
Originated Three Years Prior	2,612		2,612		1
Originated Four Years Prior	2,937		2,937		1,867
Originated Five or More Years Prior	49,845		49,845		33,980
Revolving Loans	3,140		3,140		19,288
Gross loans	60,231		60,231		58,509
Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Commercial Portfolio Segment [Member]
Originated Current Fiscal Year	28,025		28,025		178,832
Originated One Year Prior	156,775		156,775		263,210
Originated Two Years Prior	206,534		206,534		265,946
Originated Three Years Prior	278,336		278,336		38,910
Originated Four Years Prior	32,780		32,780		14,900
Originated Five or More Years Prior	137,367		137,367		127,257
Revolving Loans	674,174		674,174		689,675
Gross loans	1,513,991		1,513,991		1,578,730
Gross write-off, current year			0		54
Gross write-off, one year prior			0		3,397
Gross write-off, two years prior			0		0
Gross write-off, three years prior			48		0
Gross write-off, four years prior			0		280
Gross write-off, five years prior			256		11,094
Gross write-off, revolving			1,918		63
Gross write-off	1,923	2,250	2,223	6,117	14,888
Commercial Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year	28,025		28,025		178,582
Originated One Year Prior	156,525		156,525		252,151
Originated Two Years Prior	194,865		194,865		265,705
Originated Three Years Prior	275,437		275,437		38,909
Originated Four Years Prior	31,253		31,253		13,726
Originated Five or More Years Prior	115,199		115,199		112,145
Revolving Loans	654,332		654,332		684,779
Gross loans	1,455,636		1,455,636		1,545,997
Commercial Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		10,620
Originated Two Years Prior	10,854		10,854		0
Originated Three Years Prior	2,675		2,675		0
Originated Four Years Prior	1,527		1,527		562
Originated Five or More Years Prior	9,600		9,600		3,417
Revolving Loans	19,142		19,142		3,199
Gross loans	43,798		43,798		17,798
Commercial Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year	0		0		250
Originated One Year Prior	250		250		439
Originated Two Years Prior	815		815		241
Originated Three Years Prior	224		224		1
Originated Four Years Prior	0		0		612
Originated Five or More Years Prior	12,568		12,568		11,695
Revolving Loans	700		700		1,697
Gross loans	14,557		14,557		14,935
Commercial Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Commercial Real Estate Portfolio Segment [Member]
Originated Current Fiscal Year	165,564		165,564		248,660
Originated One Year Prior	272,510		272,510		1,561,841
Originated Two Years Prior	1,527,540		1,527,540		1,586,997
Originated Three Years Prior	1,534,711		1,534,711		352,445
Originated Four Years Prior	353,040		353,040		354,646
Originated Five or More Years Prior	1,495,352		1,495,352		1,276,583
Revolving Loans	386,453		386,453		514,373
Gross loans	5,735,170		5,735,170		5,895,545
Gross write-off, current year			0		0
Gross write-off, one year prior			0		0
Gross write-off, two years prior			0		0
Gross write-off, three years prior			0		0
Gross write-off, four years prior			0		0
Gross write-off, five years prior			8,117		2,142
Gross write-off, revolving			0		0
Gross write-off	1,636	237	8,116	1,954	2,142
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year	165,564		165,564		248,660
Originated One Year Prior	272,510		272,510		1,561,841
Originated Two Years Prior	1,527,540		1,527,540		1,585,109
Originated Three Years Prior	1,532,854		1,532,854		352,445
Originated Four Years Prior	351,278		351,278		353,391
Originated Five or More Years Prior	1,393,978		1,393,978		1,232,240
Revolving Loans	386,453		386,453		497,588
Gross loans	5,630,177		5,630,177		5,831,274
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	64,707		64,707		24,202
Revolving Loans	0		0		0
Gross loans	64,707		64,707		24,202
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		1,888
Originated Three Years Prior	1,857		1,857		0
Originated Four Years Prior	1,762		1,762		1,255
Originated Five or More Years Prior	36,667		36,667		20,141
Revolving Loans	0		0		16,785
Gross loans	40,286		40,286		40,069
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Commercial Construction Portfolio Segment [Member]
Originated Current Fiscal Year	14,250		14,250		582
Originated One Year Prior	200		200		5,463
Originated Two Years Prior	2,137		2,137		15,645
Originated Three Years Prior	9,034		9,034		6,236
Originated Four Years Prior	6,236		6,236		0
Originated Five or More Years Prior	10,500		10,500		0
Revolving Loans	573,730		573,730		592,570
Gross loans	616,087		616,087		620,496
Gross write-off, current year			0		0
Gross write-off, one year prior			0		0
Gross write-off, two years prior			0		0
Gross write-off, three years prior			0		0
Gross write-off, four years prior			0		0
Gross write-off, five years prior			0		0
Gross write-off, revolving			0		0
Gross write-off	(0)	(0)	0	(0)	0
Commercial Construction Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year	14,250		14,250		582
Originated One Year Prior	200		200		5,463
Originated Two Years Prior	2,137		2,137		15,645
Originated Three Years Prior	9,034		9,034		6,236
Originated Four Years Prior	6,236		6,236		0
Originated Five or More Years Prior	10,500		10,500		0
Revolving Loans	562,826		562,826		583,870
Gross loans	605,183		605,183		611,796
Commercial Construction Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	8,700		8,700		8,700
Gross loans	8,700		8,700		8,700
Commercial Construction Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	2,204		2,204		0
Gross loans	2,204		2,204		0
Commercial Construction Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Residential Portfolio Segment [Member]
Originated Current Fiscal Year	12,353		12,353		15,455
Originated One Year Prior	15,022		15,022		42,830
Originated Two Years Prior	41,006		41,006		22,542
Originated Three Years Prior	22,054		22,054		21,704
Originated Four Years Prior	18,780		18,780		19,896
Originated Five or More Years Prior	103,014		103,014		93,909
Revolving Loans	38,020		38,020		39,705
Gross loans	250,249		250,249		256,041
Gross write-off, current year			0		0
Gross write-off, one year prior			0		0
Gross write-off, two years prior			0		0
Gross write-off, three years prior			0		0
Gross write-off, four years prior			0		0
Gross write-off, five years prior			0		0
Gross write-off, revolving			0		18
Gross write-off	(0)	(0)	0	18	18
Residential Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year	12,353		12,353		15,455
Originated One Year Prior	15,022		15,022		42,830
Originated Two Years Prior	40,374		40,374		21,987
Originated Three Years Prior	21,523		21,523		21,704
Originated Four Years Prior	17,605		17,605		19,896
Originated Five or More Years Prior	101,765		101,765		91,114
Revolving Loans	34,999		34,999		36,082
Gross loans	243,641		243,641		249,068
Residential Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	639		639		651
Revolving Loans	2,785		2,785		2,817
Gross loans	3,424		3,424		3,468
Residential Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	632		632		555
Originated Three Years Prior	531		531		0
Originated Four Years Prior	1,175		1,175		0
Originated Five or More Years Prior	610		610		2,144
Revolving Loans	236		236		806
Gross loans	3,184		3,184		3,505
Residential Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Consumer Portfolio Segment [Member]
Originated Current Fiscal Year	716		716		849
Originated One Year Prior	26		26		83
Originated Two Years Prior	2		2		0
Originated Three Years Prior	0		0		5
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	91		91		92
Gross loans	835		835		1,029
Gross write-off, current year			0		0
Gross write-off, one year prior			0		0
Gross write-off, two years prior			0		0
Gross write-off, three years prior			0		0
Gross write-off, four years prior			0		0
Gross write-off, five years prior			0		0
Gross write-off, revolving			0		1
Gross write-off	(0)	$ (0)	0	$ (0)	1
Consumer Portfolio Segment [Member] | Pass [Member]
Originated Current Fiscal Year	716		716		849
Originated One Year Prior	26		26		83
Originated Two Years Prior	2		2		0
Originated Three Years Prior	0		0		5
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	91		91		92
Gross loans	835		835		1,029
Consumer Portfolio Segment [Member] | Special Mention [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Consumer Portfolio Segment [Member] | Substandard [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	0		0		0
Consumer Portfolio Segment [Member] | Doubtful [Member]
Originated Current Fiscal Year	0		0		0
Originated One Year Prior	0		0		0
Originated Two Years Prior	0		0		0
Originated Three Years Prior	0		0		0
Originated Four Years Prior	0		0		0
Originated Five or More Years Prior	0		0		0
Revolving Loans	0		0		0
Gross loans	$ 0		$ 0		$ 0

X

- Definition

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

+ References

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- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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- Definition

Amortized cost of financing receivable originated in fiscal year 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

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

+ References

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