Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 3,443
Due after one year through five years	19,478
Due after five years through ten years	73,007
Due after ten years	158,659
Amortized Cost	729,942	$ 719,555
Securities Available-for-Sale, Fair Value
Due in one year or less	3,481
Due after one year through five years	20,316
Due after five years through ten years	75,307
Due after ten years	158,239
Total Fair Value	726,352	709,786
MBS/CMO - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost	475,002
Amortized Cost	475,002	471,852
Securities Available-for-Sale, Fair Value
Fair value	468,656
Total Fair Value	468,656	461,914
Equity Securities
Securities Available-for-Sale: Amortized cost
Amortized cost	353
Amortized Cost	353	353
Securities Available-for-Sale, Fair Value
Fair value	353
Total Fair Value	$ 353	$ 353