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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 30, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment of goodwill	$ 0	$ 0
Impairment of other intangible		0
Additional allowance for credit losses for loans		457,309	$ 54,400	$ 56,927
Deferred tax assets		110,946		31,316
Additional reserve for unfunded commitments			6,400
Retained earnings		657,451		$ 679,895
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Additional allowance for credit losses for loans			54,438
Deferred tax assets			12,639
Additional reserve for unfunded commitments			6,400
Retained earnings		$ 44,800	$ (44,820)

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