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Summary of Significant Accounting Policies - Adoption of New Accounting Policies (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans |  | $ 5,314,337
Allowance for credit losses on loans |  | 43,288
Allowance for credit losses on held-to-maturity debt securities |  | 0
Deferred tax asset |  | 14,851
Reserve for unfunded commitments |  | 430
Retained earnings | $ 417,212 | $ 380,737
Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans | 7,091 |
Allowance for credit losses on loans | 28,387 |
Allowance for credit losses on held-to-maturity debt securities | 303 |
Deferred tax asset | 5,898 |
Reserve for unfunded commitments | 2,413 |
Retained earnings | (18,114) |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans | 5,321,428 |
Allowance for credit losses on loans | 71,675 |
Allowance for credit losses on held-to-maturity debt securities | 303 |
Deferred tax asset | 20,749 |
Reserve for unfunded commitments | 2,843 |
Retained earnings | $ 362,623 |

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