Investment Securities (Maturity Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized Cost
Due in one year or less, amortized cost	$ 8,404
Due after one year through five years, amortized cost	10,442
Due after five years through 10 years, amortized cost	0
Due after ten years, amortized cost	1,753
Total, amortized cost	20,599
Mortgage-backed securities, amortized cost	417,458
Total, amortized cost	438,057
Estimated Fair Value
Due in one year or less, estimated fair value	8,406
Due after one year through five years, estimated fair value	10,548
Due after five years through 10 years, estimated fair value	0
Due after ten years, estimated fair value	2,737
Total, estimated fair value	21,691
Mortgage-backed securities, estimated fair value	392,923
Estimated fair value	414,614	564,850
Amortized Cost
Mortgage-backed securities, amortized cost	151,795
Total, amortized cost	151,795	0
Estimated Fair Value
Mortgage-backed securities, estimated fair value	141,125
Estimated fair value	$ 141,125