Loans (Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract
Commercial real estate
Financing Receivable, Modifications [Line Items]
Total Recorded Investment				$ 56
Financing Receivable, Modifications, Number of Contracts | contract				1
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 57
Financing Receivable, Modifications, Post-Modification Recorded Investment				57
Originated Loan
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 188	$ 210	$ 997	$ 1,090
Financing Receivable, Modifications, Number of Contracts | contract	11	15	31	29
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 191	$ 210	$ 1,099	$ 1,122
Financing Receivable, Modifications, Post-Modification Recorded Investment	191	210	1,099	1,130
Originated Loan | Commercial real estate
Financing Receivable, Modifications [Line Items]
Total Recorded Investment			$ 14
Financing Receivable, Modifications, Number of Contracts | contract			1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 14
Financing Receivable, Modifications, Post-Modification Recorded Investment			14
Originated Loan | Residential real estate
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 90	$ 75	$ 478	$ 173
Financing Receivable, Modifications, Number of Contracts | contract	1	2	7	5
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 90	$ 75	$ 483	$ 173
Financing Receivable, Modifications, Post-Modification Recorded Investment	90	75	483	173
Originated Loan | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 19	$ 23	$ 286	$ 23
Financing Receivable, Modifications, Number of Contracts | contract	2	3	6	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 22	$ 23	$ 291	$ 23
Financing Receivable, Modifications, Post-Modification Recorded Investment	22	23	291	23
Originated Loan | Consumer, indirect
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 34	$ 78	$ 86	$ 107
Financing Receivable, Modifications, Number of Contracts | contract	5	7	11	9
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 34	$ 78	$ 127	$ 107
Financing Receivable, Modifications, Post-Modification Recorded Investment	34	78	127	107
Originated Loan | Consumer, other
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 9	$ 34	$ 10	$ 46
Financing Receivable, Modifications, Number of Contracts | contract	2	3	3	5
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 9	$ 34	$ 10	$ 46
Financing Receivable, Modifications, Post-Modification Recorded Investment	9	34	10	46
Originated Loan | Consumer, other
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 43	$ 112	$ 96	$ 153
Financing Receivable, Modifications, Number of Contracts | contract	7	10	14	14
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 43	$ 112	$ 137	$ 153
Financing Receivable, Modifications, Post-Modification Recorded Investment	43	112	137	153
Originated Loan | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 36		$ 123	$ 685
Financing Receivable, Modifications, Number of Contracts | contract	1		3	6
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 36		$ 174	$ 716
Financing Receivable, Modifications, Post-Modification Recorded Investment	36		$ 174	$ 724
Acquired Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract			2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 52	$ 0
Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses			0	0
Total Recorded Investment	$ 95	$ 365	$ 860	$ 1,344
Financing Receivable, Modifications, Number of Contracts | contract	3	3	17	20
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 95	$ 365	$ 873	$ 1,354
Financing Receivable, Modifications, Post-Modification Recorded Investment	95	365	873	1,356
Acquired Loans | Commercial real estate
Financing Receivable, Modifications [Line Items]
Total Recorded Investment			$ 265
Financing Receivable, Modifications, Number of Contracts | contract			2
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 271
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 271
Acquired Loans | Commercial real estate
Financing Receivable, Modifications [Line Items]
Total Recorded Investment		$ 224		$ 223
Financing Receivable, Modifications, Number of Contracts | contract		1		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 224		$ 223
Financing Receivable, Modifications, Post-Modification Recorded Investment		224		$ 223
Acquired Loans | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract			1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 44	$ 0
Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses, Amount			0	0
Total Recorded Investment	$ 61	$ 141	$ 263	$ 923
Financing Receivable, Modifications, Number of Contracts | contract	2	2	8	11
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 61	$ 141	$ 264	$ 927
Financing Receivable, Modifications, Post-Modification Recorded Investment	61	$ 141	264	929
Acquired Loans | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Total Recorded Investment	$ 34		$ 323	$ 173
Financing Receivable, Modifications, Number of Contracts | contract	1		5	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 34		$ 328	$ 179
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 34		$ 328	179
Acquired Loans | Consumer, indirect
Financing Receivable, Modifications [Line Items]
Total Recorded Investment				$ 8
Financing Receivable, Modifications, Number of Contracts | contract				2
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 8
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 8
Acquired Loans | Consumer, other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract			1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 8	$ 0
Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses, Amount			0	0
Total Recorded Investment			$ 9	$ 17
Financing Receivable, Modifications, Number of Contracts | contract			2	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 10	$ 17
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 10	17
Acquired Loans | Consumer, other
Financing Receivable, Modifications [Line Items]
Total Recorded Investment				$ 25
Financing Receivable, Modifications, Number of Contracts | contract				5
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 25
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 25