Loans Allowance For Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	$ 3,539	$ 14,097	$ 339
Loan Type
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	16,539	17,881
Charge-offs	(5,131)	(16,698)
Recoveries	3,309	1,562
Net recoveries (charge-offs)	(1,822)	(15,136)
Provision for loan losses	3,479	13,794
Ending balance	16,539	17,881	17,881	$ 18,196	$ 16,539
Period-end amount allocated to:
Loans individually evaluated for impairment				1,412	1,820
Loans collectively evaluated for impairment				16,784	14,719
Ending balance	16,539	17,881	17,881	18,196	16,539
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	5,382	4,036
Charge-offs	(1,017)	(13,576)
Recoveries	306	98
Net recoveries (charge-offs)	(711)	(13,478)
Provision for loan losses	1,682	14,824
Ending balance	5,382	4,036	4,036	6,353	5,382
Period-end amount allocated to:
Loans individually evaluated for impairment				585	351
Loans collectively evaluated for impairment				5,768	5,031
Ending balance	5,382	4,036	4,036	6,353	5,382
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	1,257	1,627
Charge-offs	(588)	(628)
Recoveries	278	315
Net recoveries (charge-offs)	(310)	(313)
Provision for loan losses	35	(57)
Ending balance	1,257	1,627	1,627	982	1,257
Period-end amount allocated to:
Loans individually evaluated for impairment				24	106
Loans collectively evaluated for impairment				958	1,151
Ending balance	1,257	1,627	1,627	982	1,257
Home equity lines of credit
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	732	694
Charge-offs	(73)	(125)
Recoveries	56	119
Net recoveries (charge-offs)	(17)	(6)
Provision for loan losses	(27)	44
Ending balance	732	694	694	688	732
Period-end amount allocated to:
Loans individually evaluated for impairment				0	0
Loans collectively evaluated for impairment				688	732
Ending balance	732	694	694	688	732
Consumer, other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	1,971	1,587
Charge-offs	(2,655)	(1,353)
Recoveries	1,285	755
Net recoveries (charge-offs)	(1,370)	(598)
Provision for loan losses	2,229	982
Ending balance	1,971	1,587	1,587	2,830	1,971
Period-end amount allocated to:
Loans individually evaluated for impairment				0	0
Loans collectively evaluated for impairment				2,830	1,971
Ending balance	1,971	1,587	1,587	2,830	1,971
Deposit account overdrafts
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	121	112
Charge-offs	(774)	(774)
Recoveries	175	171
Net recoveries (charge-offs)	(599)	(603)
Provision for loan losses	649	612
Ending balance	121	112	112	171	121
Period-end amount allocated to:
Loans individually evaluated for impairment				0	0
Loans collectively evaluated for impairment				171	121
Ending balance	121	112	112	171	121
Commercial real estate, other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	7,076	9,825
Charge-offs	(24)	(242)
Recoveries	1,209	104
Net recoveries (charge-offs)	1,185	(138)
Provision for loan losses	(1,089)	(2,611)
Ending balance	7,076	9,825	9,825	7,172	7,076
Period-end amount allocated to:
Loans individually evaluated for impairment				803	1,363
Loans collectively evaluated for impairment				6,369	5,713
Ending balance	7,076	9,825	9,825	7,172	7,076
Acquired Purchased Credit Impaired Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, January 1, 2013	240	0
Charge-offs	(67)	(63)
Recoveries	0	0
Net recoveries (charge-offs)	(67)	(63)
Ending balance	240	0	0	233	240
Period-end amount allocated to:
Ending balance	240	0	$ 0	$ 233	$ 240
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	$ 60	$ 303