Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Allowance for Loan Losses:
Beginning balance	$ 20,071		$ 19,680		$ 19,909		$ 18,773
Provision for loan losses	1,470	[1]	1,185	[2]	4,298	[1]	3,821	[2]
Loans charged off	(2,348)		(1,964)		(6,692)		(6,328)
Recoveries	1,108		901		2,786		3,536
Ending Balance	20,301		19,802		20,301		19,802
Commercial Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	9,498		10,223		10,281		9,731
Provision for loan losses	(106)	[1]	(227)	[2]	(443)	[1]	176	[2]
Loans charged off	(409)		(281)		(1,053)		(1,059)
Recoveries	354		222		552		1,089
Ending Balance	9,337		9,937		9,337		9,937
Residential Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	1,382		1,514		1,455		1,553
Provision for loan losses	(44)	[1]	14	[2]	56	[1]	(166)	[2]
Loans charged off	(158)		(100)		(632)		(564)
Recoveries	160		91		461		696
Ending Balance	1,340		1,519		1,340		1,519
Consumer Portfolio Segment [Member]
Allowance for Loan Losses:
Beginning balance	7,131		6,218		6,709		5,767
Provision for loan losses	1,593	[1]	1,415	[2]	4,062	[1]	3,825	[2]
Loans charged off	(1,781)		(1,583)		(5,007)		(4,705)
Recoveries	594		588		1,773		1,751
Ending Balance	7,537		6,638		7,537		6,638
Unallocated
Allowance for Loan Losses:
Beginning balance	2,060		1,725		1,464		1,722
Provision for loan losses	27	[1]	(17)	[2]	623	[1]	(14)	[2]
Loans charged off	0		0		0		0
Recoveries	0		0		0		0
Ending Balance	$ 2,087		$ 1,708		$ 2,087		$ 1,708

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjMyMDUzNDliNTBhNTRkZThhMmZhYmY4Nzc1ZDIxYjBlfFRleHRTZWxlY3Rpb246NzcyMURDMDdBMTczQzgyRTg3RkJDNDk5MDM1MTgwOTcM}

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjMyMDUzNDliNTBhNTRkZThhMmZhYmY4Nzc1ZDIxYjBlfFRleHRTZWxlY3Rpb246MDI3QTVCODJBOUEwQTlCMDZFMDBDNDk5MDI4NjNBQ0EM}