Allowance for Loan Losses (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 Losses:
Beginning balance	$ 19,395		$ 19,926		$ 18,773		$ 19,946
Provision for loan losses	1,040	[1]	435	[2]	2,636	[1]	1,270	[2]
Loans charged off	(2,090)		(1,842)		(4,364)		(3,482)
Recoveries	1,335		985		2,635		1,770
Ending Balance	19,680		19,504		19,680		19,504
Commercial Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	9,377		11,168		9,731		11,482
Provision for loan losses	917	[1]	(816)	[2]	403	[1]	(1,091)	[2]
Loans charged off	(360)		(555)		(778)		(822)
Recoveries	289		447		867		675
Ending Balance	10,223		10,244		10,223		10,244
Residential Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	1,496		1,769		1,553		1,834
Provision for loan losses	(231)	[1]	(22)	[2]	(180)	[1]	103	[2]
Loans charged off	(203)		(232)		(464)		(471)
Recoveries	452		80		605		129
Ending Balance	1,514		1,595		1,514		1,595
Consumer Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	6,334		5,106		5,767		4,945
Provision for loan losses	817	[1]	749	[2]	2,410	[1]	1,536	[2]
Loans charged off	(1,527)		(1,055)		(3,122)		(2,189)
Recoveries	594		458		1,163		966
Ending Balance	6,218		5,258		6,218		5,258
Unallocated
Allowance for Loan Losses:
Beginning balance	2,188		1,883		1,722		1,685
Provision for loan losses	(463)	[1]	524	[2]	3	[1]	722	[2]
Loans charged off	0		0		0		0
Recoveries	0		0		0		0
Ending Balance	$ 1,725		$ 2,407		$ 1,725		$ 2,407

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