Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Investments [Line Items]
Amortized Cost: Due in one year or less	$ 17,012
Amortized Cost: Due after one year through five years	53,265
Amortized Cost: Due after five years through ten years	25,026
Amortized Cost: Due after ten years	59,942
Amortized Cost: Sub Total	155,245
Fair Value: Due in one year or less	17,013
Fair Value: Due after one year through five years	53,558
Fair Value: Due after five years through ten years	25,825
Fair Value: Due after ten years	51,156
Available For Sale Debt Maturities Fair Value Sub Total	147,552
Available-for-sale Securities, Amortized Cost Basis	234,683	231,745
Available-for-sale Securities	227,795	221,117	221,117
Amortized Cost: Due after five years through ten years, Held to maturity	15,506
Amortized Cost: Due after ten years, Held to maturity	11,785
Amortized Cost: Total, Held to maturity	27,291
Fair Value: Due after five years through ten years, Held to maturity	16,106
Fair Value: Due after ten years, Held to maturity	11,899
Fair Value: Total, Held to maturity	28,005
Held-to-maturity securities	109,040	109,449	109,449
Held-to-maturity securities, fair value	111,320	110,771	110,771
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	28,774	45,175
Available-for-sale Securities	29,008	45,273
Held-to-maturity securities	58,427	58,400
Held-to-maturity securities, fair value	59,351	59,008
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	36,636	26,007
Available-for-sale Securities	37,046	25,957
Held-to-maturity securities	16,331	16,425
Held-to-maturity securities, fair value	16,890	16,737
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	14,028	8,611
Available-for-sale Securities	14,189	8,707
Held-to-maturity securities	6,991	7,379
Held-to-maturity securities, fair value	$ 7,074	$ 7,384