Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 4,663
Due after one year through five years	16,432
Due after five years through ten years	71,210
Due after ten years	142,351
Total Amortized Cost	714,056	$ 631,800
Securities Available-for-Sale, Fair Value
Due in one year or less	4,700
Due after one year through five years	17,282
Due after five years through ten years	75,651
Due after ten years	149,577
Total Fair Value	732,911	637,840
Mortgage-backed Securities - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost	479,047
Total Amortized Cost	479,047	426,087
Securities Available-for-Sale, Fair Value
Fair value	485,348
Total Fair Value	485,348	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