Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 3,819
Due after one year through five years	24,833
Due after five years through ten years	72,505
Due after ten years	140,149
Total Amortized Cost	702,500	$ 631,800
Securities Available-for-Sale, Fair Value
Due in one year or less	3,856
Due after one year through five years	25,488
Due after five years through ten years	76,992
Due after ten years	147,926
Total Fair Value	719,916	637,840
Mortgage-backed Securities - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost	460,841
Total Amortized Cost	460,841	426,087
Securities Available-for-Sale, Fair Value
Fair value	465,301
Total Fair Value	465,301	423,961
Equity Securities
Securities Available-for-Sale: Amortized cost
Amortized cost	353
Total Amortized Cost	353	353
Securities Available-for-Sale, Fair Value
Fair value	353
Total Fair Value	$ 353	$ 353