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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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