Securities (Amortized Cost and Fair Value of Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 3,685
Due after one year through five years	20,649
Due after five years through ten years	62,544
Due after ten years	58,387
Total	615,537	614,085
Securities Available-for-Sale, Fair Value
Due in one year or less	3,720
Due after one year through five years	20,574
Due after five years through ten years	64,374
Due after ten years	60,609
Total	615,392	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	469,919
Total	469,919	481,724
Securities Available-for-Sale, Fair Value
Fair value	465,762
Total	465,762	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