Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Allowance for Loan Losses:
Beginning balance	$ 19,680		$ 19,504		$ 18,773		$ 19,946
Provision for loan losses	1,185	[1]	1,091	[2]	3,821	[1]	2,361	[2]
Loans charged off	(1,964)		(2,724)		(6,328)		(6,206)
Recoveries	901		1,203		3,536		2,973
Ending Balance	19,802		19,074		19,802		19,074
Commercial Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	10,223		10,244		9,731		11,482
Provision for loan losses	(227)	[1]	571	[2]	176	[1]	(520)	[2]
Loans charged off	(281)		(1,029)		(1,059)		(1,851)
Recoveries	222		479		1,089		1,154
Ending Balance	9,937		10,265		9,937		10,265
Residential Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	1,514		1,595		1,553		1,834
Provision for loan losses	14	[1]	40	[2]	(166)	[1]	143	[2]
Loans charged off	(100)		(211)		(564)		(682)
Recoveries	91		154		696		283
Ending Balance	1,519		1,578		1,519		1,578
Consumer Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	6,218		5,258		5,767		4,945
Provision for loan losses	1,415	[1]	1,275	[2]	3,825	[1]	2,811	[2]
Loans charged off	(1,583)		(1,484)		(4,705)		(3,673)
Recoveries	588		570		1,751		1,536
Ending Balance	6,638		5,619		6,638		5,619
Unallocated
Allowance for Loan Losses:
Beginning balance	1,725		2,407		1,722		1,685
Provision for loan losses	(17)	[1]	(795)	[2]	(14)	[1]	(73)	[2]
Loans charged off	0		0		0		0
Recoveries	0		0		0		0
Ending Balance	$ 1,708		$ 1,612		$ 1,708		$ 1,612

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