NOTE 9 - BUSINESS SEGMENT INFORMATION - Selected Financial Information on the Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Interest and dividend income	$ 121,573			$ 125,015			$ 362,691	$ 361,935
Interest expense	52,881			60,216			158,645	175,068
Net interest income	68,692			64,799			204,046	186,867
Provision for credit losses	4,452			4,305			11,614	12,582
Noninterest income
Capital markets revenue	16,901			23,832			42,994	40,217
Other segment revenue items	13,581			12,819			39,867	35,441
Total noninterest income	30,482			36,651			82,861	75,658
Noninterest expense
Salaries and benefits expense	32,803			34,338			96,312	90,176
Occupancy expense	8,165			7,363			22,986	20,655
Other segment expense items	13,758			14,886			40,710	41,878
Total noninterest expense	54,726			56,587			160,008	152,709
Income tax expense	3,562			3,844			9,217	5,704
Net income	36,434	$ 36,251	$ 33,383	36,714	$ 29,019	$ 25,797	106,068	91,530
Goodwill	138,595			138,595			138,595	138,595	$ 138,595
Intangibles	6,562			9,077			6,562	9,077	8,080
Total assets	9,795,320			9,568,302			9,795,320	9,568,302	$ 9,498,194
Operating Segments | Commercial Banking | QCBT
Segment Reporting [Line Items]
Interest and dividend income	35,584			38,591			109,504	111,385
Interest expense	16,485			19,013			51,313	54,213
Net interest income	19,099			19,578			58,191	57,172
Provision for credit losses	1,633			2,015			2,509	5,509
Noninterest income
Capital markets revenue	217			795			318	811
Other segment revenue items	5,977			5,711			18,163	16,199
Total noninterest income	6,194			6,506			18,481	17,010
Noninterest expense
Salaries and benefits expense	8,168			8,220			24,485	23,078
Occupancy expense	1,798			1,660			4,916	4,802
Other segment expense items	3,642			4,761			11,428	12,859
Total noninterest expense	13,608			14,641			40,829	40,739
Income tax expense	498			1,057			2,320	2,779
Net income	9,554			8,371			31,014	25,155
Goodwill	2,791			2,791			2,791	2,791
Total assets	2,709,310			2,794,136			2,709,310	2,794,136
Operating Segments | Commercial Banking | CRBT
Segment Reporting [Line Items]
Interest and dividend income	35,871			34,488			105,491	99,369
Interest expense	12,576			13,687			37,561	39,079
Net interest income	23,295			20,801			67,930	60,290
Provision for credit losses	527			499			1,044	1,775
Noninterest income
Capital markets revenue	13,953			16,852			36,650	31,008
Other segment revenue items	4,333			3,909			11,852	10,321
Total noninterest income	18,286			20,761			48,502	41,329
Noninterest expense
Salaries and benefits expense	10,410			9,705			29,553	26,518
Occupancy expense	1,887			1,918			5,715	5,284
Other segment expense items	4,272			3,904			11,676	11,062
Total noninterest expense	16,569			15,527			46,944	42,864
Income tax expense	2,815			3,577			7,687	5,984
Net income	21,670			21,959			60,757	50,996
Goodwill	14,980			14,980			14,980	14,980
Intangibles	217			447			217	447
Total assets	2,979,899			2,760,379			2,979,899	2,760,379
Operating Segments | Commercial Banking | CSB
Segment Reporting [Line Items]
Interest and dividend income	22,711			21,798			66,689	62,787
Interest expense	8,470			8,742			24,950	25,312
Net interest income	14,241			13,056			41,739	37,475
Provision for credit losses	819			1			1,527	1,515
Noninterest income
Capital markets revenue	248			599			248	661
Other segment revenue items	1,452			1,493			4,521	4,237
Total noninterest income	1,700			2,092			4,769	4,898
Noninterest expense
Salaries and benefits expense	5,427			5,409			16,198	15,059
Occupancy expense	1,973			1,380			5,059	3,835
Other segment expense items	2,070			2,438			6,449	6,926
Total noninterest expense	9,470			9,227			27,706	25,820
Income tax expense	(11)			160			1	(21)
Net income	5,663			5,760			17,274	15,059
Goodwill	9,888			9,888			9,888	9,888
Intangibles				468				468
Total assets	1,780,615			1,680,476			1,780,615	1,680,476
Operating Segments | Commercial Banking | GB
Segment Reporting [Line Items]
Interest and dividend income	30,094			31,779			90,437	91,491
Interest expense	13,807			16,396			41,722	47,962
Net interest income	16,287			15,383			48,715	43,529
Provision for credit losses	1,473			1,790			6,534	3,783
Noninterest income
Capital markets revenue	2,483			5,586			5,778	7,737
Other segment revenue items	1,938			2,053			5,989	5,736
Total noninterest income	4,421			7,639			11,767	13,473
Noninterest expense
Salaries and benefits expense	7,082			7,968			21,814	21,946
Occupancy expense	1,781			1,834			5,226	5,226
Other segment expense items	3,194			3,037			9,212	9,271
Total noninterest expense	12,057			12,839			36,252	36,443
Income tax expense	(89)			536			(1,008)	(216)
Net income	7,267			7,857			18,704	16,992
Goodwill	110,936			110,936			110,936	110,936
Intangibles	6,345			8,162			6,345	8,162
Total assets	2,414,400			2,446,635			2,414,400	2,446,635
Operating Segments | Other Segments
Segment Reporting [Line Items]
Interest and dividend income	55			60			198	219
Interest expense	4,658			4,550			13,904	13,120
Net interest income	(4,603)			(4,490)			(13,706)	(12,901)
Noninterest income
Other segment revenue items	45,388			45,278			131,344	112,005
Total noninterest income	45,388			45,278			131,344	112,005
Noninterest expense
Salaries and benefits expense	1,716			3,036			4,262	3,575
Occupancy expense	726			571			2,070	1,508
Other segment expense items	1,107			1,390			3,573	3,698
Total noninterest expense	3,549			4,997			9,905	8,781
Income tax expense	349			(1,486)			217	(2,822)
Net income	36,887			37,277			107,516	93,145
Total assets	1,513,605			1,424,193			1,513,605	1,424,193
Intercompany Eliminations
Segment Reporting [Line Items]
Interest and dividend income	(2,742)			(1,701)			(9,628)	(3,316)
Interest expense	(3,115)			(2,172)			(10,805)	(4,618)
Net interest income	373			471			1,177	1,302
Noninterest income
Other segment revenue items	(45,507)			(45,625)			(132,002)	(113,057)
Total noninterest income	(45,507)			(45,625)			(132,002)	(113,057)
Noninterest expense
Other segment expense items	(527)			(644)			(1,628)	(1,938)
Total noninterest expense	(527)			(644)			(1,628)	(1,938)
Net income	(44,607)			(44,510)			(129,197)	(109,817)
Total assets	$ (1,602,509)			$ (1,537,517)			$ (1,602,509)	$ (1,537,517)