Loans and Leases - Acquired Credit Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Outstanding principal balance	$ 8,993	$ 3,551
Carrying amount	7,352	1,253
Allowance for loan losses	0	8
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning of period	144	0
Acquisition of credit impaired loans	283	305
Reclassification from nonaccretable discount	1,329	574
Accretable yield amortized to interest income	(1,672)	(717)
Disposals	(34)	(18)
End of period	$ 50	$ 144