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, 2020	Mar. 31, 2019
Receivables [Abstract]
Beginning balance	$ 1,771	$ 1,813
Additions		113
Net payments	(46)	(5)
Ending balance	1,725	1,921
Beginning balance	8,800	7,314
Additions	4,258	246
Net payments	(941)	89
Charge-offs		(530)
Ending balance	12,117	7,119
Total troubled debt restructurings	$ 13,842	$ 9,040