Fair Value Of Financial Instruments - Estimated Fair Values Of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 98,067	$ 88,611
Securities held to maturity	8,828	11,739
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	7,650	14,638
Time deposits with other banks	100	100
Securities available for sale, at fair value	98,067	88,611
Securities held to maturity	8,654	11,618
Federal Home Loan Bank stock	5,386	5,106
Loans receivable, net of allowance	765,114	688,561
Accrued interest receivable	2,270	2,058
Interest rate swaps	1,232	1,647
Non-maturity deposits	554,135	479,025
Time deposits	156,352	181,896
Short-term borrowings	39,150	29,805
Long-term borrowings	55,000	66,000
Subordinated debentures	27,843	27,840
Accrued interest payable	361	364
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	7,650	14,638
Time deposits with other banks	100	100
Securities available for sale, at fair value	98,067	88,611
Securities held to maturity	8,828	11,739
Federal Home Loan Bank stock	5,386	5,106
Loans receivable, net of allowance	747,475	672,912
Accrued interest receivable	2,270	2,058
Interest rate swaps	1,232	1,647
Non-maturity deposits	554,135	479,025
Time deposits	155,790	181,346
Short-term borrowings	39,143	29,805
Long-term borrowings	53,657	66,388
Subordinated debentures	25,176	24,519
Accrued interest payable	361	364
Quoted Prices In Active Markets For Identical Assets (Level I) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	7,650	14,638
Short-term borrowings	39,143	29,805
Significant Other Observable Inputs (Level II) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposits with other banks	100	100
Securities available for sale, at fair value	98,067	88,611
Securities held to maturity	8,828	11,739
Federal Home Loan Bank stock	5,386	5,106
Accrued interest receivable	2,270	2,058
Interest rate swaps	1,232	1,647
Non-maturity deposits	554,135	479,025
Time deposits	155,790	181,346
Long-term borrowings	53,657	66,388
Subordinated debentures	25,176	24,519
Accrued interest payable	361	364
Significant Unobservable Inputs (Level III) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, net of allowance	$ 747,475	$ 672,912