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Note 11 - BUSINESS SEGMENT INFORMATION - Intercompany Eliminations (Details) - Intercompany Eliminations - Commercial Banking - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Equity in net income of subsidiary bank	$ 43,947	$ 33,915	$ 108,202	$ 102,502
Investment in subsidiary bank	1,331,566	1,233,427	1,331,566	1,233,427
QCBT
Segment Reporting Information [Line Items]
Equity in net income of subsidiary bank	8,371	4,911	25,155	15,371
Investment in subsidiary bank	298,385	276,585	298,385	276,585
CRBT
Segment Reporting Information [Line Items]
Equity in net income of subsidiary bank	21,959	15,945	50,996	51,725
Investment in subsidiary bank	453,386	407,476	453,386	407,476
CSB
Segment Reporting Information [Line Items]
Equity in net income of subsidiary bank	5,760	5,527	15,059	14,603
Investment in subsidiary bank	190,208	170,690	190,208	170,690
GB
Segment Reporting Information [Line Items]
Equity in net income of subsidiary bank	7,857	7,532	16,992	20,803
Investment in subsidiary bank	$ 389,587	$ 378,676	$ 389,587	$ 378,676

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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