Investment Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) security item	Dec. 31, 2017 USD ($)
Securities [Line Items]
Available-for-sale securities pledged as collateral | $	$ 95,800,000	$ 105,900,000
Collection of the original recorded investment on HTM securities (percentage)	85.00%
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	19
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	19
Number of securities, impaired for more than 12 months	19
Other-than-temporarily impaired | $	$ 0
US Government Agency Obligations [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	7
Number of securities, impaired for more than 12 months	7
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	43
Number of securities, impaired for more than 12 months	40
Number Of Impaired Municipal Securities, School Districts, Additional Private Insurance	20
Number Of Impaired Municipal Securities, Remaining	15
Number Of Impaired Municipal Securities School Districts State Qualified School Aid	28
Number of impaired municipal securities, insured school districts	2
Number of impaired municipal securities, unisured school districts	2
Number Of Impaired Municipal Securities, Townships	7
Other-than-temporarily impaired | $	$ 0
State and Municipal Taxable [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	1
Number of securities, impaired for more than 12 months | security	1
Other-than-temporarily impaired | $	$ 0
Collection of the original recorded investment on HTM securities (percentage)	0.97%
Corporate Bonds [Member]
Securities [Line Items]
Securities in unrealized loss positions qualitative disclosure number of positions | security	11
Number of securities, impaired for more than 12 months	7
Other-than-temporarily impaired | $	$ 0
Minimum [Member]
Securities [Line Items]
Percent of principal outstanding collected of held-to-maturity securities	85.00%
Maximum [Member] | Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Unrealized loss of security from book value	7.13%
Maximum [Member] | Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Unrealized loss of security from book value	4.86%
Maximum [Member] | US Government Agency Obligations [Member]
Securities [Line Items]
Unrealized loss of security from book value	4.18%
Maximum [Member] | State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Unrealized loss of security from book value	10.18%
Maximum [Member] | Corporate Bonds [Member]
Securities [Line Items]
Unrealized loss of security from book value	4.15%