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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest |  | $ 1,469,509 |  | $ 1,269,652 | $ 1,469,509 | $ 1,269,652 | $ 1,435,920 | $ 1,350,058 | $ 1,339,772
Off-Balance-Sheet, Credit Loss, Liability |  | 52,541 | $ 23,890 | 49,479 | 52,541 | 49,479 | 84,568 | $ 32,034 | $ 112,962
Retained earnings |  | 4,426,222 |  |  | 4,426,222 |  | $ 4,114,446 |  |
Unrealized gain (loss) |  |  | (83,000) |  | (69,000) |  |  |  |
Unrealized loss, tax benefit |  |  | $ 27,000 |  | 23,000 |  |  |  |
Dividends |  | $ 94,000 |  | $ 138,000 | $ 194,000 | $ 298,000 |  |  |
Adjustments |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |
Period of deferment | 2 years |  |  |  |  |  |  |  |
Percentage amount deferred per year | 25.00% |  |  |  |  |  |  |  |
Percentage amount phased in during year | 25.00% |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | $ 1,100,000 |  |  |  |  |  |  |  |
Off-Balance-Sheet, Credit Loss, Liability | 116,000 |  |  |  |  |  |  |  |
Deferred Tax Assets, Net | 306,000 |  |  |  |  |  |  |  |
Retained earnings | $ 953,000 |  |  |  |  |  |  |  |

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