Investment Securities (Maturity Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Amortized Cost
Total, amortized cost	$ 374,457
Estimated Fair Value
Estimated fair value	363,296	414,614	[1]
Amortized Cost
Total, amortized cost	144,684	151,795	[1]
Estimated Fair Value
Estimated fair value	139,582	141,125	[1]
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Due after one year through five years, amortized cost	2,034
Estimated Fair Value
Due after one year through five years, estimated fair value	2,053
Estimated fair value	2,053	2,077
Residential Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized Cost
Mortgage-backed securities, amortized cost	306,255
Estimated Fair Value
Mortgage-backed securities, estimated fair value	295,069
Estimated fair value	302,447	341,147
Amortized Cost
Mortgage-backed securities, amortized cost	134,618
Estimated Fair Value
Mortgage-backed securities, estimated fair value	129,759
Estimated fair value	129,759	131,817
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	7,267
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	7,378
Residential Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Mortgage-backed securities, amortized cost	17,653
Estimated Fair Value
Mortgage-backed securities, estimated fair value	18,668
Estimated fair value	18,668	20,752
Commercial mortgage-backed securities - GSE [Member]
Estimated Fair Value
Estimated fair value	21,644	21,439
Estimated Fair Value
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	22,475
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	21,644
Commercial Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Mortgage-backed securities, amortized cost	10,376
Estimated Fair Value
Mortgage-backed securities, estimated fair value	10,057
Estimated fair value	10,057	9,585
Amortized Cost
Mortgage-backed securities, amortized cost	10,066
Estimated Fair Value
Mortgage-backed securities, estimated fair value	9,823
Estimated fair value	9,823	9,308
Corporate Note Securities [Member]
Amortized Cost
Due in one year or less, amortized cost	8,397
Estimated Fair Value
Due in one year or less, estimated fair value	8,427
Estimated fair value	$ 8,427	$ 16,877

[1] Derived from audited consolidated financial statements