Fair Value Of Financial Instruments - Estimated Fair Values Of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 99,797	$ 88,611
Securities held to maturity	8,788	11,739
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	7,688	14,638
Time deposits with other banks	100	100
Securities available for sale, at fair value	99,797	88,611
Securities held to maturity	8,630	11,618
Federal Home Loan Bank stock	4,269	5,106
Loans receivable, net of allowance	712,003	688,561
Accrued interest receivable	2,006	2,058
Interest rate swaps	1,687	1,647
Non-maturity deposits	550,289	479,025
Time deposits	146,287	181,896
Short-term borrowings	14,800	29,805
Long-term borrowings	66,000	66,000
Subordinated debentures	27,841	27,840
Accrued interest payable	352	364
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	7,688	14,638
Time deposits with other banks	100	100
Securities available for sale, at fair value	99,797	88,611
Securities held to maturity	8,788	11,739
Federal Home Loan Bank stock	4,269	5,106
Loans receivable, net of allowance	695,158	672,912
Accrued interest receivable	2,006	2,058
Interest rate swaps	1,687	1,647
Non-maturity deposits	550,289	479,025
Time deposits	145,823	181,346
Short-term borrowings	14,797	29,805
Long-term borrowings	64,520	66,388
Subordinated debentures	24,747	24,519
Accrued interest payable	352	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	7,688	14,638
Short-term borrowings	14,797	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	99,797	88,611
Securities held to maturity	8,788	11,739
Federal Home Loan Bank stock	4,269	5,106
Accrued interest receivable	2,006	2,058
Interest rate swaps	1,687	1,647
Non-maturity deposits	550,289	479,025
Time deposits	145,823	181,346
Long-term borrowings	64,520	66,388
Subordinated debentures	24,747	24,519
Accrued interest payable	352	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	$ 695,158	$ 672,912