Investment Securities (Maturity Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available-for-Sale, Amortized Cost
Total, amortized cost	$ 354,924
Available-for-Sale, Estimated Fair Value
Estimated fair value	350,040	414,614
Held-to-Maturity, Amortized Cost
Amortized cost	142,461	151,795
Held-to-Maturity, Estimated Fair Value
Estimated fair value	140,875	141,125
U.S. government sponsored agencies debt securities [Member]
Available-for-Sale, Amortized Cost
Due after one year through five years, amortized cost	2,028
Available-for-Sale, Estimated Fair Value
Due after one year through five years, estimated fair value	2,044
Estimated fair value	2,044	2,077
Held-to-Maturity, Amortized Cost
Due after one year through five years, amortized cost	0
Held-to-Maturity, Estimated Fair Value
Due after one year through five years	0
Residential mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after five years through 10 years, amortized cost	2,327
Due after ten years, amortized cost	292,973
Available-for-Sale, Estimated Fair Value
Due after five years through 10 years, estimated fair value	2,367
Due after ten years, estimated fair value	287,778
Estimated fair value	290,145	341,147
Held-to-Maturity, Amortized Cost
Due after five years through 10 years, amortized cost	0
Due after ten years, amortized cost	132,396
Held-to-Maturity, Estimated Fair Value
Due after five years through 10 years	0
Due after ten years	130,877
Estimated fair value	130,877	131,817
Residential mortgage-backed securities - Private [Member]
Available-for-Sale, Amortized Cost
Due after ten years, amortized cost	16,455
Available-for-Sale, Estimated Fair Value
Due after ten years, estimated fair value	17,271
Estimated fair value	17,271	20,752
Held-to-Maturity, Amortized Cost
Due after ten years, amortized cost	0
Held-to-Maturity, Estimated Fair Value
Due after ten years	0
Commercial mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after five years through 10 years, amortized cost	22,377
Available-for-Sale, Estimated Fair Value
Due after five years through 10 years, estimated fair value	21,958
Estimated fair value	21,958	21,439
Held-to-Maturity, Amortized Cost
Due after five years through 10 years, amortized cost	0
Held-to-Maturity, Estimated Fair Value
Due after five years through 10 years	0
Commercial mortgage-backed securities - Private [Member]
Available-for-Sale, Amortized Cost
Due after ten years, amortized cost	10,365
Available-for-Sale, Estimated Fair Value
Due after ten years, estimated fair value	10,215
Estimated fair value	10,215	9,585
Held-to-Maturity, Amortized Cost
Due after ten years, amortized cost	10,065
Held-to-Maturity, Estimated Fair Value
Due after ten years	9,998
Estimated fair value	9,998	9,308
Corporate notes [Member]
Available-for-Sale, Amortized Cost
Due in one year or less, amortized cost	8,399
Available-for-Sale, Estimated Fair Value
Due in one year or less, estimated fair value	8,407
Estimated fair value	8,407	16,877
Held-to-Maturity, Amortized Cost
Due in one year or less, amortized cost	0
Held-to-Maturity, Estimated Fair Value
Due in one year or less, estimated fair value	$ 0