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Note 9 - BUSINESS SEGMENT INFORMATION - Intercompany Eliminations (Details) - Intercompany Eliminations - Commercial Banking - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Equity in net income of subsidiary bank | $ 33,797 | $ 36,186 | $ 64,255 | $ 68,587
Investment in subsidiary bank | 1,324,161 | 1,184,883 | 1,324,161 | 1,184,883
QCBT |  |  |  |
Equity in net income of subsidiary bank | 8,240 | 5,557 | 16,784 | 10,460
Investment in subsidiary bank | 297,789 | 268,996 | 297,789 | 268,996
CRBT |  |  |  |
Equity in net income of subsidiary bank | 15,432 | 17,736 | 29,037 | 35,779
Investment in subsidiary bank | 454,519 | 386,642 | 454,519 | 386,642
CSB |  |  |  |
Equity in net income of subsidiary bank | 5,161 | 4,627 | 9,299 | 9,076
Investment in subsidiary bank | 182,701 | 161,611 | 182,701 | 161,611
GB |  |  |  |
Equity in net income of subsidiary bank | 4,964 | 8,266 | 9,135 | 13,272
Investment in subsidiary bank | $ 389,152 | $ 367,634 | $ 389,152 | $ 367,634

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