Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Loans Modified as Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Receivables [Abstract]
Beginning balance	$ 2,495	$ 1,771
Additions	281
Net payments	(57)	(46)
Ending balance	2,719	1,725
Beginning balance	5,650	8,800
Additions	673	4,258
Net payments	(343)	(941)
Charge-offs	(395)
Ending balance	5,585	12,117
Total troubled debt restructurings	$ 8,304	$ 13,842