Loans Troubled Debt Restructurings (Details)	12 Months Ended
Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items]
Additional commitments to lend funds to debtors whose terms have been modified in a TDR	$ 0
Originated Loan
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	35	40
Pre-modification recorded investment in loans modified as TDR	$ 1,231,000	$ 1,480,000
Post-modification recorded investment in loans modified as TDR	1,231,000	1,480,000
Total Recorded Investment	$ 1,134,000	$ 1,391,000
Originated Loan \| Commercial real estate, other
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	1
Pre-modification recorded investment in loans modified as TDR	$ 14,000
Post-modification recorded investment in loans modified as TDR	14,000
Total Recorded Investment	$ 14,000
Originated Loan \| Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract		3
Pre-modification recorded investment in loans modified as TDR		$ 109,000
Post-modification recorded investment in loans modified as TDR		109,000
Total Recorded Investment		$ 107,000
Originated Loan \| Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	4	7
Pre-modification recorded investment in loans modified as TDR	$ 210,000	$ 836,000
Post-modification recorded investment in loans modified as TDR	210,000	836,000
Total Recorded Investment	$ 149,000	$ 750,000
Originated Loan \| Residential real estate
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	7	8
Pre-modification recorded investment in loans modified as TDR	$ 483,000	$ 266,000
Post-modification recorded investment in loans modified as TDR	483,000	266,000
Total Recorded Investment	$ 473,000	$ 266,000
Originated Loan \| Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	6	5
Pre-modification recorded investment in loans modified as TDR	$ 296,000	$ 81,000
Post-modification recorded investment in loans modified as TDR	296,000	81,000
Total Recorded Investment	$ 289,000	$ 81,000
Originated Loan \| Consumer, indirect
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	15	14
Pre-modification recorded investment in loans modified as TDR	$ 218,000	$ 164,000
Post-modification recorded investment in loans modified as TDR	218,000	164,000
Total Recorded Investment	$ 201,000	$ 164,000
Originated Loan \| Consumer, other
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	2	3
Pre-modification recorded investment in loans modified as TDR	$ 10,000	$ 24,000
Post-modification recorded investment in loans modified as TDR	10,000	24,000
Total Recorded Investment	$ 8,000	$ 23,000
Originated Loan \| Consumer, other
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	17	17
Pre-modification recorded investment in loans modified as TDR	$ 228,000	$ 188,000
Post-modification recorded investment in loans modified as TDR	228,000	188,000
Total Recorded Investment	$ 209,000	$ 187,000
Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	18	25
Pre-modification recorded investment in loans modified as TDR	$ 1,060,000	$ 1,599,000
Post-modification recorded investment in loans modified as TDR	1,060,000	1,601,000
Total Recorded Investment	$ 1,012,000	$ 1,585,000
Number of contracts modified as a TDR that subsequently defaulted \| contract	2
Recorded investment in loans modified as a TDR that subsequently defaulted	$ 64,000
Impact on allowance for loan losses for loans modified as a TDR that subsequently defaulted	0
Acquired Loans \| Commercial real estate, construction
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	3	2
Pre-modification recorded investment in loans modified as TDR	$ 288,000	$ 237,000
Post-modification recorded investment in loans modified as TDR	288,000	237,000
Total Recorded Investment	$ 280,000	$ 237,000
Acquired Loans \| Residential real estate
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	9	14
Pre-modification recorded investment in loans modified as TDR	$ 442,000	$ 1,080,000
Post-modification recorded investment in loans modified as TDR	442,000	1,082,000
Total Recorded Investment	$ 412,000	$ 1,076,000
Number of contracts modified as a TDR that subsequently defaulted \| contract	2
Recorded investment in loans modified as a TDR that subsequently defaulted	$ 64,000
Impact on allowance for loan losses for loans modified as a TDR that subsequently defaulted	0
Acquired Loans \| Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	5	4
Pre-modification recorded investment in loans modified as TDR	$ 328,000	$ 260,000
Post-modification recorded investment in loans modified as TDR	328,000	260,000
Total Recorded Investment	$ 320,000	$ 250,000
Acquired Loans \| Consumer, indirect
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract		2
Pre-modification recorded investment in loans modified as TDR		$ 7,000
Post-modification recorded investment in loans modified as TDR		7,000
Total Recorded Investment		$ 7,000
Acquired Loans \| Consumer, other
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract	1	3
Pre-modification recorded investment in loans modified as TDR	$ 2,000	$ 15,000
Post-modification recorded investment in loans modified as TDR	2,000	15,000
Total Recorded Investment	$ 0	$ 15,000
Acquired Loans \| Consumer, other
Financing Receivable, Modifications [Line Items]
Number of contracts modified as a TDR \| contract		5
Pre-modification recorded investment in loans modified as TDR		$ 22,000
Post-modification recorded investment in loans modified as TDR		22,000
Total Recorded Investment		$ 22,000

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Financing Receivable Modifications Post Modification Recorded Investment During Period

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Financing Receivable Modifications Recorded Investment During Period

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Description of how troubled debt restructurings within the previous 12 months and for which there was a payment default during the period are factored into the determination of the allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554

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