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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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