Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 1,398	$ 3,046	$ 1,231	$ 4,079
Transfers	[1]	0	(772)	0	(1,554)
Net (charge-offs) recoveries		(9)	(93)	(26)	(53)
Provision for loan losses, acquired loans		(140)	(467)	44	(758)
Balance at end of period		$ 1,249	$ 1,714	$ 1,249	$ 1,714

[1] The allowance for loan losses balance related to the remaining loans acquired in the Bay Bank merger, which were transferred from acquired loans to LHFI during the second quarter of 2018, and the remaining loans acquired in the Heritage acquisition and the Reliance merger, which were transferred from acquired impaired loans to LHFI during the third quarter of 2018.