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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Receivables [Abstract]
Beginning balance	$ 1,529	$ 1,238	$ 1,813	$ 1,061
Additions			113	37
Net payments	(242)	(8)	(291)	(56)
Net transfers from (to) non-accrual	917		569	188
Ending balance	2,204	1,230	2,204	1,230
Beginning balance	7,834	5,776	7,314	1,570
Additions	2,893	1,667	4,321	7,123
Net payments	(540)	(84)	(1,266)	(1,002)
Charge-offs	(62)		(592)	(144)
Net transfers from (to) accrual	(917)		(569)	(188)
Ending balance	9,208	7,359	9,208	7,359
Total troubled debt restructurings	$ 11,412	$ 8,589	$ 11,412	$ 8,589