Basis of Presentation - Schedule of Cumulative Effect Adjustments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 5,772,052			$ 5,198,404
Allowance for credit losses	91,250	$ 85,411		35,154	$ 33,505	$ 32,822	$ 32,423
Reserve for unfunded commitments				140
Deferred tax assets	$ 21,404			16,457
Retained earnings				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