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Summary of Significant Accounting Policies - CECL Adjustments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ (52,162) | $ (168,098) | $ (145,387) |  | $ (50,814) | $ (50,059) | $ (49,026)
Deferred tax assets, net | 27,282 | 42,047 |  |  |  |  |
Remaining purchase discount on loans | (50,958) |  |  |  |  |  |
Reserve for unfunded commitments | 946 | 20,035 | $ 17,335 |  |  |  |
Retained earnings | 617,355 | $ 596,779 |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | (42,484) |  |  | $ (42,484) |  |  |
Deferred tax assets, net | 12,305 |  |  |  |  |  |
Remaining purchase discount on loans | 5,469 |  |  |  |  |  |
Reserve for unfunded commitments | 10,389 |  |  |  |  |  |
Retained earnings | (35,099) |  |  |  |  |  |
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | (94,646) |  |  |  |  |  |
Deferred tax assets, net | 39,587 |  |  |  |  |  |
Remaining purchase discount on loans | (45,489) |  |  |  |  |  |
Reserve for unfunded commitments | 11,335 |  |  |  |  |  |
Retained earnings | $ 582,256 |  |  |  |  |  |

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