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Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2020
--- | --- | --- | --- | --- | ---
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Retained earnings | $ 3,250,478 | $ 3,163,640 |  |  |
Allowance for credit losses | 1,479,306 | 1,357,075 | $ 1,227,362 | $ 1,165,335 |
Liability for unfunded commitments | 32,720 | 124,924 | $ 32,707 | 72,713 |
Accounting Standards Update 2016-13 |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Allowance for credit losses |  |  |  |  | $ 1,100,000
Liability for unfunded commitments |  |  |  |  | 116,000
Deferred tax asset |  |  |  |  | $ 306,000
Adjusted Phase-In Amounts Remaining |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Retained earnings |  |  |  | 836,351 |
Allowance for credit losses |  |  |  | 1,038,145 |
Liability for unfunded commitments |  |  |  | 104,377 |
Deferred tax asset |  |  |  | $ 306,171 |
Adjusted Phase-In Amounts Remaining | Accounting Standards Update 2016-13 | Remaining Adjusted Transition Amounts to be Phased-In |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Retained earnings | 418,175 |  |  |  |
Allowance for credit losses | 519,073 |  |  |  |
Liability for unfunded commitments | 52,189 |  |  |  |
Deferred tax asset | 153,087 |  |  |  |
Adjustments | Accounting Standards Update 2016-13 |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Retained earnings | (209,088) | (209,088) |  |  |
Allowance for credit losses | (259,536) | (259,536) |  |  |
Liability for unfunded commitments | (26,094) | (26,094) |  |  |
Deferred tax asset | $ (76,542) | $ (76,542) |  |  |

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