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Note 9 - BUSINESS SEGMENT INFORMATION - Intercompany Eliminations (Details) - Intercompany Eliminations - Commercial Banking - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Equity in net income of subsidiary bank	$ 30,457	$ 32,401
Investment in subsidiary bank	1,291,433	1,149,251
QCBT
Equity in net income of subsidiary bank	8,543	4,903
Investment in subsidiary bank	289,980	263,814
CRBT
Equity in net income of subsidiary bank	13,605	18,043
Investment in subsidiary bank	438,716	369,195
CSB
Equity in net income of subsidiary bank	4,137	4,449
Investment in subsidiary bank	177,664	156,946
GB
Equity in net income of subsidiary bank	4,172	5,006
Investment in subsidiary bank	$ 385,073	$ 359,296

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+ References

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Amount of investment in equity method investee and investment in and advance to affiliate.

+ 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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