Loans and Allowance for Credit Losses (ALLL Rollforward) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Allowance for Loan and Lease Losses [Roll Forward] | ||||
| Beginning balance | $ 217,516 | $ 222,730 | $ 219,825 | $ 223,153 |
| Provision (recovery) | 10,280 | 11,851 | 50,480 | 43,508 |
| Charge-offs | (7,079) | (15,773) | (54,265) | (52,789) |
| Recoveries | 759 | 1,076 | 5,436 | 6,012 |
| Ending balance | 221,476 | 219,884 | 221,476 | 219,884 |
| Commercial | ||||
| Allowance for Loan and Lease Losses [Roll Forward] | ||||
| Beginning balance | 205,141 | 208,961 | 208,412 | 211,203 |
| Provision (recovery) | 10,044 | 12,451 | 49,282 | 42,089 |
| Charge-offs | (7,079) | (15,773) | (54,265) | (52,581) |
| Recoveries | 759 | 1,073 | 5,436 | 6,001 |
| Ending balance | 208,865 | 206,712 | 208,865 | 206,712 |
| Residential | ||||
| Allowance for Loan and Lease Losses [Roll Forward] | ||||
| Beginning balance | 12,375 | 13,769 | 11,413 | 11,950 |
| Provision (recovery) | 236 | (600) | 1,198 | 1,419 |
| Charge-offs | 0 | 0 | 0 | (208) |
| Recoveries | 0 | 3 | 0 | 11 |
| Ending balance | $ 12,611 | $ 13,172 | $ 12,611 | $ 13,172 |