Loans and Allowance for Loan Losses - Allowance (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)
Changes in the allowance for loan losses
Balance at beginning of period	$ 8,447	$ 6,481	$ 8,006	$ 6,223
Charge-offs	(635)		(826)	(424)
Recoveries	4	5	11	28
Provision	1,275	561	1,900	1,220
Balance at end of period	9,091	7,047	9,091	7,047
Individually evaluated for impairment	1,596	943	1,596	943
Collectively evaluated for impairment	7,495	6,104	7,495	6,104
Net deferred fees and costs	863	1,200	$ 863	1,200
Number of rolling quarters utilized by Commercial, Residential, Home Equity, Installment and Credit Card pools | item			12
Unfunded commitment liability	224	164	$ 224	164
Commercial
Changes in the allowance for loan losses
Balance at beginning of period	6,221	4,647	6,066	4,363
Charge-offs	(578)		(680)	(410)
Recoveries				21
Provision	1,313	554	1,570	1,227
Balance at end of period	6,956	5,201	6,956	5,201
Individually evaluated for impairment	1,338	605	1,338	605
Collectively evaluated for impairment	5,618	4,596	5,618	4,596
Loans acquired, purchase price					$ 74,300
Premium on loans acquired, ratio					1.024
Loans acquired, premium paid					$ 1,800
Loans acquired, outstanding balance	$ 28,200		28,200			$ 46,800
Loans acquired, outstanding balance, decrease			46,100
Loans acquired, refinanced			19,600
Loans acquired, sold in participation			7,500
Loans acquired, sold back to institution			$ 9,700
Loans acquired, remaining portfolio, weighted average yield	5.02%		5.02%
Residential
Changes in the allowance for loan losses
Balance at beginning of period	$ 1,157	957	$ 1,095	962
Charge-offs	(57)		(124)	(14)
Recoveries				1
Provision	(89)	61	40	69
Balance at end of period	1,011	1,018	1,011	1,018
Individually evaluated for impairment		303		303
Collectively evaluated for impairment	1,011	715	1,011	715
Home Equity
Changes in the allowance for loan losses
Balance at beginning of period	747	680	715	691
Recoveries				1
Provision	11	(48)	43	(60)
Balance at end of period	758	632	758	632
Individually evaluated for impairment		28		28
Collectively evaluated for impairment	758	604	758	604
Consumer
Changes in the allowance for loan losses
Balance at beginning of period	322	197	130	207
Charge-offs			(22)
Recoveries	4	5	11	5
Provision	40	(6)	247	(16)
Balance at end of period	366	196	366	196
Individually evaluated for impairment	258	7	258	7
Collectively evaluated for impairment	$ 108	$ 189	$ 108	$ 189