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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Receivables [Abstract]
Beginning balance	$ 2,395	$ 3,151	$ 2,495	$ 1,771
Additions	0	604	281	604
Net payments	(29)	(1,462)	(410)	(1,538)
Net transfers from non-accrual	0	0	0	1,456
Ending balance	2,366	2,293	2,366	2,293
Beginning balance	4,441	7,449	5,650	8,800
Additions	0	0	673	5,633
Net payments	(2,584)	(302)	(3,568)	(1,688)
Charge-offs	(10)	(852)	(908)	(4,994)
Net transfers to accrual	0	0	0	(1,456)
Ending balance	1,847	6,295	1,847	6,295
Total troubled debt restructurings	$ 4,213	$ 8,588	$ 4,213	$ 8,588