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Recent Accounting and Regulatory Pronouncements - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  | $ 314,144 | $ 350,401 | $ 457,309 | $ 440,159 | $ 434,608 |  | $ 56,927
Deferred tax assets |  | 19,684 |  | 110,946 |  |  |  |
Additional reserve for unfunded commitments |  | 28,300 |  |  |  |  |  |
Retained earnings |  | $ 925,044 |  | $ 657,451 |  |  |  |
Adjustments |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  |  |  |  |  | 433,066 |  | 111,365
ASU 2016-13 |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans | [1] |  |  |  |  |  | $ 54,438 |
Deferred tax assets | [2] |  |  |  |  |  | 12,639 |
Additional reserve for unfunded commitments |  |  |  |  |  |  | 6,400 |
Retained earnings | [3] |  |  |  |  |  | (44,820) |
ASU 2016-13 | Adjustments |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  |  |  |  | $ 109,442 | $ (1,542) | 56,927 | $ 51,030
Deferred tax assets |  |  |  |  |  |  | 31,316 |
Additional reserve for unfunded commitments |  |  |  |  |  |  | 6,400 |
Retained earnings |  |  |  |  |  |  | $ 679,895 |
[1] | This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] | This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] | This is the net adjustment to retained earnings related to the adoption of ASC 326.

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