Securities (Amortized Cost and Fair Value of Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 3,716
Due after one year through five years	20,274
Due after five years through ten years	65,615
Due after ten years	65,158
Total	575,582	614,085
Securities Available-for-Sale, Fair Value
Due in one year or less	3,737
Due after one year through five years	20,174
Due after five years through ten years	67,862
Due after ten years	68,119
Total	575,741	606,032
Securities Held-to-Maturity, Carrying Amount
Due in one year or less	0
Due after one year through five years	184
Due after five years through ten years	0
Due after ten years	0
Carrying Amount	184	268
Securities Held-to-Maturity, Fair Value
Due in one year or less	0
Due after one year through five years	186
Due after five years through ten years	0
Due after ten years	0
Total	186	271
Mortgage-backed Securities - Residential
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	420,466
Total	420,466	481,724
Securities Available-for-Sale, Fair Value
Fair value	415,496
Total	415,496	473,230
Equity Securities
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	353
Total	353	353
Securities Available-for-Sale, Fair Value
Fair value	353
Total	$ 353	$ 353