Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets: Cash and cash equivalents, Fair Value Disclosure	$ 14,315	$ 17,174
Financial assets: Securities, Fair Value Disclosure	285,706	302,564
Financial assets: Loans receivable, net, Fair Value Disclosure	751,637	716,661
Financial assets: Mortgage servicing rights, Fair Value Disclosure	239	250
Financial assets: Regulatory stock, Fair Value Disclosure	3,115	2,119
Financial assets: Bank owned life insurance, Fair Value Disclosure	36,839	36,133
Financial assets: Accrued interest receivable, Fair Value Disclosure	3,729	3,643
Financial liabilities: Deposits, Fair Value Disclosure	923,452	925,561
Financial liabilities: Short-term borrowings, Fair Value Disclosure	47,229	32,811
Financial liabilities: Other borrowings, Fair Value Disclosure	31,549	31,863
Financial liabilities: Accrued interest payable, Fair Value Disclosure	1,167	1,069
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure	0	0
Financial assets: Cash and cash equivalents	14,315	17,174	$ 33,133	$ 10,010
Financial assets: Securities	285,706	302,564
Financial assets: Loans receivable, net	748,254	707,426
Financial assets: Mortgage servicing rights	208	232
Financial assets: Regulatory stock	3,115	2,119
Financial assets: Bank owned life insurance	36,839	36,133
Financial assets: Accrued interest receivable	3,729	3,643
Financial liabilities: Deposits	924,022	925,385
Financial liabilities: Short-term borrowings	47,229	32,811
Financial liabilities: Other borrowings	31,771	32,001
Financial liabilities: Accrued interest payable	1,167	1,069
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets: Cash and cash equivalents, Fair Value Disclosure	14,315	17,174
Financial assets: Securities, Fair Value Disclosure	236	424
Financial assets: Loans receivable, net, Fair Value Disclosure	0	0
Financial assets: Mortgage servicing rights, Fair Value Disclosure	0	0
Financial assets: Regulatory stock, Fair Value Disclosure	3,115	2,119
Financial assets: Bank owned life insurance, Fair Value Disclosure	36,839	36,133
Financial assets: Accrued interest receivable, Fair Value Disclosure	3,729	3,643
Financial liabilities: Deposits, Fair Value Disclosure	647,046	629,829
Financial liabilities: Short-term borrowings, Fair Value Disclosure	47,229	32,811
Financial liabilities: Other borrowings, Fair Value Disclosure	0	0
Financial liabilities: Accrued interest payable, Fair Value Disclosure	1,167	1,069
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets: Cash and cash equivalents, Fair Value Disclosure	0	0
Financial assets: Securities, Fair Value Disclosure	285,470	302,140
Financial assets: Loans receivable, net, Fair Value Disclosure	0	0
Financial assets: Mortgage servicing rights, Fair Value Disclosure	0	0
Financial assets: Regulatory stock, Fair Value Disclosure	0	0
Financial assets: Bank owned life insurance, Fair Value Disclosure	0	0
Financial assets: Accrued interest receivable, Fair Value Disclosure	0	0
Financial liabilities: Deposits, Fair Value Disclosure	0	0
Financial liabilities: Short-term borrowings, Fair Value Disclosure	0	0
Financial liabilities: Other borrowings, Fair Value Disclosure	0	0
Financial liabilities: Accrued interest payable, Fair Value Disclosure	0	0
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets: Cash and cash equivalents, Fair Value Disclosure	0	0
Financial assets: Securities, Fair Value Disclosure	0	0
Financial assets: Loans receivable, net, Fair Value Disclosure	751,637	716,661
Financial assets: Mortgage servicing rights, Fair Value Disclosure	239	250
Financial assets: Regulatory stock, Fair Value Disclosure	0	0
Financial assets: Bank owned life insurance, Fair Value Disclosure	0	0
Financial assets: Accrued interest receivable, Fair Value Disclosure	0	0
Financial liabilities: Deposits, Fair Value Disclosure	276,406	295,732
Financial liabilities: Short-term borrowings, Fair Value Disclosure	0	0
Financial liabilities: Other borrowings, Fair Value Disclosure	31,549	31,863
Financial liabilities: Accrued interest payable, Fair Value Disclosure	0	0
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure	$ 0	$ 0