Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 5,503
Due after one year through five years	19,451
Due after five years through ten years	71,844
Due after ten years	108,562
Total Amortized Cost	631,800	$ 626,383
Securities Available-for-Sale: Fair Value
Due in one year or less	5,573
Due after one year through five years	19,670
Due after five years through ten years	75,581
Due after ten years	112,702
Total Fair Value	637,840	630,995
Securities Held-to-Maturity: Carrying Amount
Due in one year or less	95
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Total Carrying Amount	95	184
Securities Held-to-Maturity: Fair Value
Due in one year or less	95
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Total Fair Value	95	186
Mortgage-backed Securities – Residential
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	426,087
Total Amortized Cost	426,087	458,709
Securities Available-for-Sale: Fair Value
Available-for-Sale, Fair Value	423,961
Total Fair Value	423,961	457,304
Equity Securities
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	353
Total Amortized Cost	353	353
Securities Available-for-Sale: Fair Value
Available-for-Sale, Fair Value	353
Total Fair Value	$ 353	$ 353