Securities (Amortized Cost and Fair Value of Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 3,447
Due after one year through five years	10,882
Due after five years through ten years	70,604
Due after ten years	48,496
Total	617,719	614,085
Securities Available-for-Sale, Fair Value
Due in one year or less	3,499
Due after one year through five years	11,145
Due after five years through ten years	71,210
Due after ten years	49,831
Total	613,170	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
Total	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 [Member]
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	483,937
Total	483,937	481,724
Securities Available-for-Sale, Fair Value
Fair value	477,132
Total	477,132	473,230
Equity Securities [Member]
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