Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 10,006	$ 13,535	$ 11,397	$ 11,992
Provision for loan losses, acquired loans	(2,564)	607	(4,169)	1,916
Loans charged-off	(19)	(2,054)		(2,451)
Recoveries		392	195	1,023
Net (charge-offs) recoveries	(19)	(1,662)	195	(1,428)
Balance at end of period	$ 7,423	$ 12,480	$ 7,423	$ 12,480