Investment Securities (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Securities [Line Items]
Available-for-sale securities pledged as collateral | $	$ 118.2	$ 116.7
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions	18
Number of securities, impaired for more than 12 months	10
Unrealized loss of security from book value	5.11%
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions	17
Unrealized loss of security from book value	2.58%
US Government Agency Obligations [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions	10
Number of securities, impaired for more than 12 months	0
Unrealized loss of security from book value	1.83%
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions	28
Number of impaired municipal securities, insured school districts	8
Number of impaired municipal securities, unisured school districts	9
Number of impaired municipal securities, townships insured	4
Number of impaired municipal securities, townships uninsured	7
Unrealized loss of security from book value	4.96%
Corporate Bonds [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions	6
Number of securities, impaired for more than 12 months	3
Unrealized loss of security from book value	4.17%