Loans Allowance For Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	$ 3,772	$ 3,539	$ 14,097
Period-end amount allocated to:
Growth in Loans and Leases Receivable, Net of Deferred Income	$ 132,200	$ 152,500
Percentage Growth in Loans and Leases Receivable, Net of Deferred Income	6.00%	7.00%
Consumer, other
Period-end amount allocated to:
Percentage Growth in Loans and Leases Receivable, Net of Deferred Income		7.00%
Loan Type
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 18,196	$ 16,539
Charge-offs	(4,871)	(5,131)
Recoveries	1,470	3,309
Net (charge-offs) recoveries	(3,401)	(1,822)
Provision for loan losses	3,890	3,479
Ending balance	18,196	16,539	16,539	$ 18,685	$ 18,196
Period-end amount allocated to:
Loans individually evaluated for impairment				339	1,412
Loans collectively evaluated for impairment				18,346	16,784
Ending balance	18,196	16,539	16,539	18,685	18,196
Commercial real estate, other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	7,172	7,076
Charge-offs	(408)	(24)
Recoveries	146	1,209
Net (charge-offs) recoveries	(262)	1,185
Provision for loan losses	887	(1,089)
Ending balance	7,172	7,076	7,076	7,797	7,172
Period-end amount allocated to:
Loans individually evaluated for impairment				1	803
Loans collectively evaluated for impairment				7,796	6,369
Ending balance	7,172	7,076	7,076	7,797	7,172
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	6,353	5,382
Charge-offs	(175)	(1,017)
Recoveries	1	306
Net (charge-offs) recoveries	(174)	(711)
Provision for loan losses	(366)	1,682
Ending balance	6,353	5,382	5,382	5,813	6,353
Period-end amount allocated to:
Loans individually evaluated for impairment				199	585
Loans collectively evaluated for impairment				5,614	5,768
Ending balance	6,353	5,382	5,382	5,813	6,353
Growth in Loans and Leases Receivable, Net of Deferred Income	$ 95,500	$ 70,600
Percentage Growth in Loans and Leases Receivable, Net of Deferred Income	8.00%	20.00%
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 982	$ 1,257
Charge-offs	(637)	(588)
Recoveries	152	278
Net (charge-offs) recoveries	(485)	(310)
Provision for loan losses	407	35
Ending balance	982	1,257	1,257	904	982
Period-end amount allocated to:
Loans individually evaluated for impairment				58	24
Loans collectively evaluated for impairment				846	958
Ending balance	982	1,257	1,257	904	982
Home equity lines of credit
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	688	732
Charge-offs	(131)	(73)
Recoveries	13	56
Net (charge-offs) recoveries	(118)	(17)
Provision for loan losses	123	(27)
Ending balance	688	732	732	693	688
Period-end amount allocated to:
Loans individually evaluated for impairment				18	0
Loans collectively evaluated for impairment				675	688
Ending balance	688	732	732	693	688
Consumer, indirect
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,312	1,427
Charge-offs	(2,110)	(2,072)
Recoveries	764	1,059
Net (charge-offs) recoveries	(1,346)	(1,013)
Provision for loan losses	1,978	1,898
Ending balance	2,312	1,427	1,427	2,944	2,312
Period-end amount allocated to:
Loans individually evaluated for impairment				26	0
Loans collectively evaluated for impairment				2,918	2,312
Ending balance	2,312	1,427	1,427	2,944	2,312
Growth in Loans and Leases Receivable, Net of Deferred Income	$ 87,900	$ 85,700
Percentage Growth in Loans and Leases Receivable, Net of Deferred Income	35.00%	51.00%
Consumer, other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 518	$ 544
Charge-offs	(372)	(583)
Recoveries	179	226
Net (charge-offs) recoveries	(193)	(357)
Provision for loan losses	139	331
Ending balance	518	544	544	464	518
Period-end amount allocated to:
Loans individually evaluated for impairment				37	0
Loans collectively evaluated for impairment				427	518
Ending balance	518	544	544	464	518
Deposit account overdrafts
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	171	121
Charge-offs	(1,038)	(774)
Recoveries	215	175
Net (charge-offs) recoveries	(823)	(599)
Provision for loan losses	722	649
Ending balance	171	121	121	70	171
Period-end amount allocated to:
Loans individually evaluated for impairment				0	0
Loans collectively evaluated for impairment				70	171
Ending balance	171	121	121	70	171
Acquired Purchased Credit Impaired Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	233	240
Charge-offs	(7)	(67)
Recoveries	0	0
Net (charge-offs) recoveries	226	173
Ending balance	233	240	240	108	233
Period-end amount allocated to:
Ending balance	233	240	$ 240	$ 108	$ 233
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	$ (118)	$ 60