Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 4,294	$ 10,006	$ 4,079	$ 11,397
Transfers	[1]	(782)		(782)
Net (charge-offs) recoveries		(25)	(19)	40	195
Provision for loan losses, acquired loans		(441)	(2,564)	(291)	(4,169)
Balance at end of period		$ 3,046	$ 7,423	$ 3,046	$ 7,423

[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.