Loans - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan
Financing Receivable Recorded Investment [Line Items]
Loans acquired	$ 1,600	$ 2,800
90 Days or More Past Due and Still Accruing	5,928	8,497
Nonaccrual Past Due and Still Accruing	$ 8,238	$ 4,136
Percentage of Total Loans Due 90 Days or More	0.23%	0.48%
Number of loans classified as troubled debt restructurings | Loan	5	2
Troubled debt restructuring balance	$ 3,100	$ 300
DCB
Financing Receivable Recorded Investment [Line Items]
90 Days or More Past Due and Still Accruing	14,200
Nonaccrual Past Due and Still Accruing	$ 3,800
Percentage of Total Loans Due 90 Days or More	27.00%