Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 2,282
Due after one year through five years	22,311
Due after five years through ten years	75,810
Due after ten years	157,839
Amortized Cost	734,035	$ 719,555
Securities Available-for-Sale, Fair Value
Due in one year or less	2,303
Due after one year through five years	23,357
Due after five years through ten years	79,589
Due after ten years	161,738
Total Fair Value	740,578	709,786
MBS/CMO - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost	475,440
Amortized Cost	475,440	471,852
Securities Available-for-Sale, Fair Value
Fair value	473,238
Total Fair Value	473,238	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