Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 2,706
Due after one year through five years	23,789
Due after five years through ten years	78,661
Due after ten years	162,281
Total Amortized Cost	743,995	$ 719,555
Securities Available-for-Sale: Fair Value
Due in one year or less	2,739
Due after one year through five years	24,531
Due after five years through ten years	81,215
Due after ten years	164,824
Fair Value	740,994	709,786
MBS/CMO – Residential
Securities Available-for-Sale: Amortized cost
Available-for-Sale, amortized cost	476,205
Total Amortized Cost	476,205	471,852
Securities Available-for-Sale: Fair Value
Available-for-Sale, Fair Value	467,332
Fair Value	467,332	461,914
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
Fair Value	$ 353	$ 353