Deposits (Summary of Average Balances and Weighted Average Rates Paid on Deposits) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Deposits [Abstract] | ||||
| Non-interest bearing, average balance | $ 9,027,447 | $ 8,203,439 | $ 8,841,564 | $ 7,873,052 |
| Non-interest bearing, average rate (in Percent) | 0.00% | 0.00% | 0.00% | 0.00% |
| Interest bearing, average balance | $ 6,620,530 | $ 5,586,547 | $ 6,341,755 | $ 5,271,474 |
| Interest-bearing, average rate (in Percent) | 2.83% | 3.36% | 2.87% | 3.37% |
| Savings and Money Market, average balance | $ 9,976,749 | $ 9,921,293 | $ 10,101,084 | $ 10,366,899 |
| Weighted Average Rate Domestic Deposit Savings and Money Market | 2.90% | 3.35% | 2.90% | 3.40% |
| Time, average balance | $ 2,339,315 | $ 3,535,051 | $ 3,109,007 | $ 3,924,209 |
| Weighted Average Rate Domestic Deposit, Time Deposits | 3.40% | 3.63% | 3.47% | 3.82% |
| Deposits, average balance | $ 27,964,041 | $ 27,246,330 | $ 28,393,410 | $ 27,435,634 |
| Weighted Average Rate Domestic Deposits | 1.99% | 2.38% | 2.05% | 2.48% |