Loans (Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) contract	Mar. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block]	March 31, 2018
Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	4
Pre-Modification	$ 89	$ 320
Post-Modification	90	320
Remaining Recorded Investment	$ 90	$ 320
Acquired Loans | Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	2
Pre-Modification	$ 24	$ 269
Post-Modification	24	269
Remaining Recorded Investment	$ 24	$ 269
Acquired Loans | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2
Pre-Modification	$ 65
Post-Modification	66
Remaining Recorded Investment	$ 66
Acquired Loans | Consumer, direct
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification		$ 1
Post-Modification		1
Remaining Recorded Investment		$ 1
Acquired Loans | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1
Pre-Modification		$ 50
Post-Modification		50
Remaining Recorded Investment		$ 50
Financial Asset Originated [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	17	11
Pre-Modification	$ 625	$ 283
Post-Modification	629	283
Remaining Recorded Investment	$ 627	$ 283
Financial Asset Originated [Member] | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2
Pre-Modification	$ 38
Post-Modification	38
Remaining Recorded Investment	$ 36
Financial Asset Originated [Member] | Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	2
Pre-Modification	$ 399	$ 193
Post-Modification	403	193
Remaining Recorded Investment	$ 403	$ 193
Financial Asset Originated [Member] | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2
Pre-Modification	$ 79
Post-Modification	79
Remaining Recorded Investment	$ 79
Financial Asset Originated [Member] | Consumer, indirect
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	6	7
Pre-Modification	$ 72	$ 86
Post-Modification	72	86
Remaining Recorded Investment	$ 72	$ 86
Financial Asset Originated [Member] | Consumer, direct
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5	2
Pre-Modification	$ 37	$ 4
Post-Modification	37	4
Remaining Recorded Investment	$ 37	$ 4
Financial Asset Originated [Member] | Consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	11	9
Pre-Modification	$ 109	$ 90
Post-Modification	109	90
Remaining Recorded Investment	$ 109	$ 90