Fair Value Measurements (Estimated Fair Values of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets, Estimated Fair Value
Investment securities held to maturity	$ 6,223	$ 6,391
Fair Value, Inputs, Level 1 [Member] | Carrying Amount [Member]
Financial assets, Estimated Fair Value
Cash and cash equivalents	41,995	31,820
Fair Value, Inputs, Level 1 [Member] | Estimated Fair Value [Member]
Financial assets, Estimated Fair Value
Cash and cash equivalents	41,995	31,820
Fair Value, Inputs, Level 2 [Member] | Carrying Amount [Member]
Financial assets, Estimated Fair Value
Investment securities held to maturity	6,162	6,247
Loans, net	1,110,019	1,083,733
Restricted securities	6,099	3,735
Bank owned life insurance	3,650	3,637
Financial liabilities, Estimated Fair Value
Noninterest-bearing demand	323,849	328,322
Checking plus interest	222,170	231,898
Money market	224,129	223,123
Savings	158,944	156,623
Club	802	398
Certificates of deposit, $100,000 or more	99,068	107,343
Other time	148,100	155,074
Short-term borrowings	72,993	21,734
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member]
Financial assets, Estimated Fair Value
Investment securities held to maturity	6,223	6,391
Loans, net	1,088,575	1,072,951
Restricted securities	6,099	3,735
Bank owned life insurance	3,650	3,637
Financial liabilities, Estimated Fair Value
Noninterest-bearing demand	323,849	328,322
Checking plus interest	222,170	231,898
Money market	224,129	223,123
Savings	158,944	156,623
Club	802	398
Certificates of deposit, $100,000 or more	96,959	105,691
Other time	143,490	151,339
Short-term borrowings	$ 72,993	$ 21,734