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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | $ 78,789 | $ 52,388 | $ 21,398 | $ 21,039
Loans |  | 6,081,715 | 4,731,315 | $ 4,453,466 |
Retained earnings |  | $ (532,874) | (478,489) |  |
Threshold period past due for nonaccrual status |  | 90 days |  |  |
Unfunded Loan Commitment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | $ 13,506 | $ 582 |  |
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit losses on loans | $ 14,600 |  |  |  |
Retained earnings | 17,100 |  |  |  |
Addition to PCD allowance for credit losses | 100 |  |  |  |
Accounting Standards Update 2016-13 | Unfunded Loan Commitment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | $ 7,500 |  |  |  |

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