NOTE 9 - BUSINESS SEGMENT INFORMATION - Selected Financial Information on the Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting Information [Line Items]
Interest and dividend income	$ 120,091	$ 116,673
Interest expense	52,653	56,687
Net interest income	67,438	59,986
Provision for credit losses	2,454	4,234
Noninterest income
Capital markets revenue	10,701	6,516
Other segment revenue items	12,251	10,376
Total noninterest income	22,952	16,892
Noninterest expense
Salaries and benefits expense	31,389	27,364
Occupancy expense	7,479	6,455
Other segment expense items	13,257	12,720
Total noninterest expense	52,125	46,539
Income tax expense	2,428	308
Net income	33,383	25,797
Goodwill	138,595	138,595	$ 138,595
Intangibles	7,574	10,400	8,080
Total assets	9,613,695	9,082,188	$ 9,498,194
Operating Segments | Commercial Banking | QCBT
Segment Reporting Information [Line Items]
Interest and dividend income	36,621	35,937
Interest expense	17,087	17,313
Net interest income	19,534	18,624
Provision for credit losses	1,400	1,412
Noninterest income
Other segment revenue items	5,809	5,211
Total noninterest income	5,809	5,211
Noninterest expense
Salaries and benefits expense	8,057	7,409
Occupancy expense	1,493	1,539
Other segment expense items	4,071	4,034
Total noninterest expense	13,621	12,982
Income tax expense	649	897
Net income	9,673	8,544
Goodwill	2,791	2,791
Total assets	3,105,984	2,771,498
Operating Segments | Commercial Banking | CRBT
Segment Reporting Information [Line Items]
Interest and dividend income	34,318	31,932
Interest expense	12,335	12,466
Net interest income	21,983	19,466
Provision for credit losses	223	86
Noninterest income
Capital markets revenue	9,029	5,603
Other segment revenue items	3,050	2,395
Total noninterest income	12,079	7,998
Noninterest expense
Salaries and benefits expense	9,113	7,861
Occupancy expense	1,941	1,596
Other segment expense items	3,391	3,552
Total noninterest expense	14,445	13,009
Income tax expense	1,965	764
Net income	17,429	13,605
Goodwill	14,980	14,980
Intangibles	330	568
Total assets	2,848,359	2,559,768
Operating Segments | Commercial Banking | CSB
Segment Reporting Information [Line Items]
Interest and dividend income	21,673	20,008
Interest expense	8,164	8,102
Net interest income	13,509	11,906
Provision for credit losses	427	1,362
Noninterest income
Capital markets revenue		62
Other segment revenue items	1,524	1,502
Total noninterest income	1,524	1,564
Noninterest expense
Salaries and benefits expense	5,369	4,873
Occupancy expense	1,460	1,238
Other segment expense items	2,001	2,105
Total noninterest expense	8,830	8,216
Income tax expense	21	(246)
Net income	5,755	4,138
Goodwill	9,888	9,888
Intangibles		733
Total assets	1,740,480	1,582,972
Operating Segments | Commercial Banking | GB
Segment Reporting Information [Line Items]
Interest and dividend income	30,424	29,343
Interest expense	13,871	15,562
Net interest income	16,553	13,781
Provision for credit losses	404	1,374
Noninterest income
Capital markets revenue	1,672	851
Other segment revenue items	2,038	1,674
Total noninterest income	3,710	2,525
Noninterest expense
Salaries and benefits expense	7,629	6,504
Occupancy expense	1,690	1,597
Other segment expense items	3,006	3,076
Total noninterest expense	12,325	11,177
Income tax expense	105	(416)
Net income	7,429	4,171
Goodwill	110,936	110,936
Intangibles	7,244	9,099
Total assets	2,418,895	2,326,244
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Interest and dividend income	69	87
Interest expense	4,607	4,286
Net interest income	(4,538)	(4,199)
Noninterest income
Other segment revenue items	41,542	31,716
Total noninterest income	41,542	31,716
Noninterest expense
Salaries and benefits expense	1,221	717
Occupancy expense	895	485
Other segment expense items	1,350	598
Total noninterest expense	3,466	1,800
Income tax expense	(312)	(691)
Net income	33,850	26,408
Total assets	1,475,099	1,354,539
Intercompany Eliminations
Segment Reporting Information [Line Items]
Interest and dividend income	(3,014)	(634)
Interest expense	(3,411)	(1,042)
Net interest income	397	408
Noninterest income
Other segment revenue items	(41,712)	(32,122)
Total noninterest income	(41,712)	(32,122)
Noninterest expense
Other segment expense items	(562)	(645)
Total noninterest expense	(562)	(645)
Net income	(40,753)	(31,069)
Total assets	$ (1,975,122)	$ (1,512,833)