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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Receivables [Abstract]
Beginning balance	$ 3,151	$ 1,529	$ 1,771	$ 1,813
Additions	604		604	113
Net payments	(1,462)	(242)	(1,538)	(291)
Net transfers from non-accrual		917	1,456	569
Ending balance	2,293	2,204	2,293	2,204
Beginning balance	7,449	7,834	8,800	7,314
Additions		2,893	5,633	4,321
Net payments	(302)	(540)	(1,688)	(1,266)
Charge-offs	(852)	(62)	(4,994)	(592)
Net transfers to accrual		(917)	(1,456)	(569)
Ending balance	6,295	9,208	6,295	9,208
Total troubled debt restructurings	$ 8,588	$ 11,412	$ 8,588	$ 11,412