Investment Securities (Maturity Schedule) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-Sale, Amortized Cost
Total	$ 386,862
Available-for-Sale, Estimated Fair Value
Total	385,994	$ 390,434	[1]
Held-to-Maturity, Amortized Cost
Total	145,127	147,967	[1]
Held-to-Maturity, Estimated Fair Value
Total	145,853	145,185	[1]
U.S. Government-sponsored agencies [Member]
Available-for-Sale, Amortized Cost
Due in one year or less	0
Available-for-Sale, Estimated Fair Value
Due in one year or less	0
Total		2,008
Held-to-Maturity, Amortized Cost
Due in one year or less	0
Held-to-Maturity, Estimated Fair Value
Due in one year or less	0
Residential mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after five years through 10 years	1,670
Due after ten years	276,851
Available-for-Sale, Estimated Fair Value
Due after five years through 10 years	1,716
Due after ten years	275,346
Total	277,062	278,107
Held-to-Maturity, Amortized Cost
Due after five years through 10 years	0
Due after ten years	118,194
Held-to-Maturity, Estimated Fair Value
Due after five years through 10 years	0
Due after ten years	118,783
Total	118,783	117,887
Residential mortgage-backed securities - Private [Member]
Available-for-Sale, Amortized Cost
Due after ten years	31,079
Available-for-Sale, Estimated Fair Value
Due after ten years	31,434
Total	31,434	33,577
Held-to-Maturity, Amortized Cost
Due after ten years	16,877
Held-to-Maturity, Estimated Fair Value
Due after ten years	16,845
Total	16,845	17,414
Commercial mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after one year through five years	21,880
Available-for-Sale, Estimated Fair Value
Due after one year through five years	22,122
Total	22,122	21,612
Held-to-Maturity, Amortized Cost
Due after one year through five years	0
Held-to-Maturity, Estimated Fair Value
Due after one year through five years	0
Commercial mortgage-backed securities - Private [Member]
Available-for-Sale, Amortized Cost
Due after ten years	17,858
Available-for-Sale, Estimated Fair Value
Due after ten years	17,848
Total	17,848	17,575
Held-to-Maturity, Amortized Cost
Due after ten years	10,056
Held-to-Maturity, Estimated Fair Value
Due after ten years	10,225
Total	10,225	9,884
Corporate notes [Member]
Available-for-Sale, Amortized Cost
Due in one year or less	20,465
Due after one year through five years	17,059
Available-for-Sale, Estimated Fair Value
Due in one year or less	20,461
Due after one year through five years	17,067
Total	37,528	$ 37,555
Held-to-Maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Held-to-Maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	$ 0

[1] Derived from audited consolidated financial statements