Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 5,790
Due after one year through five years	22,502
Due after five years through ten years	72,541
Due after ten years	137,462
Total Amortized Cost	703,362	$ 631,800
Securities Available-for-Sale, Fair Value
Due in one year or less	5,840
Due after one year through five years	23,022
Due after five years through ten years	76,500
Due after ten years	141,930
Total Fair Value	715,611	637,840
Mortgage-backed Securities - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost	464,714
Total Amortized Cost	464,714	426,087
Securities Available-for-Sale, Fair Value
Fair value	467,966
Total Fair Value	467,966	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