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Note 9 - BUSINESS SEGMENT INFORMATION - Intercompany Eliminations (Details) - Intercompany Eliminations - Commercial Banking - USD ($) $ in Thousands | 3 Months Ended
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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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