Investment Securities (Maturity Schedule) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available-for-Sale, Amortized Cost
Total	$ 374,740
Available-for-Sale, Estimated Fair Value
Total	377,646	$ 390,434	[1]
Held-to-Maturity, Amortized Cost
Total	139,813	147,967	[1]
Held-to-Maturity, Estimated Fair Value
Total	142,217	145,185	[1]
Residential mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after five years through 10 years	1,568
Due after ten years	267,601
Available-for-Sale, Estimated Fair Value
Due after five years through 10 years	1,617
Due after ten years	269,378
Total	270,995	278,107
Held-to-Maturity, Amortized Cost
Due after five years through 10 years	0
Due after ten years	115,395
Held-to-Maturity, Estimated Fair Value
Due after five years through 10 years	0
Due after ten years	117,357
Total	117,357	117,887
Residential mortgage-backed securities - Private [Member]
Available-for-Sale, Amortized Cost
Due after ten years	28,567
Available-for-Sale, Estimated Fair Value
Due after ten years	28,984
Total	28,984	33,577
Held-to-Maturity, Amortized Cost
Due after ten years	14,363
Held-to-Maturity, Estimated Fair Value
Due after ten years	14,401
Total	14,401	17,414
Commercial mortgage-backed securities - GSE [Member]
Available-for-Sale, Amortized Cost
Due after one year through five years	21,779
Available-for-Sale, Estimated Fair Value
Due after one year through five years	22,167
Total	22,167	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	17,847
Available-for-Sale, Estimated Fair Value
Due after ten years	18,081
Total	18,081	17,575
Held-to-Maturity, Amortized Cost
Due after ten years	10,055
Held-to-Maturity, Estimated Fair Value
Due after ten years	10,459
Total	10,459	9,884
Corporate notes [Member]
Available-for-Sale, Amortized Cost
Due after one year through five years	7,043
Due in one year or less	30,335
Available-for-Sale, Estimated Fair Value
Due after one year through five years	7,065
Due in one year or less	30,354
Total	37,419	$ 37,555
Held-to-Maturity, Amortized Cost
Due after one year through five years	0
Due in one year or less	0
Held-to-Maturity, Estimated Fair Value
Due after one year through five years	0
Due in one year or less	$ 0

[1] Derived from audited consolidated financial statements