Significant Accounting Policies - Schedule of Cumulative Effect Adjustments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 5,735,349		$ 5,198,404
Allowance for credit losses	92,733		35,154	$ 32,423	$ 27,122
Reserve for unfunded commitments			140
Deferred tax assets	23,629		16,457
Retained earnings	$ 256,701		195,813
Cumulative Effect Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ (706)
Allowance for credit losses		21,226	$ 21,226
Reserve for unfunded commitments		1,837
Deferred tax assets		(5,481)
Retained earnings		(16,876)
Cumulative Effect Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		5,197,698
Allowance for credit losses		56,380
Reserve for unfunded commitments		1,977
Deferred tax assets		10,976
Retained earnings		$ 178,937