Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for Sale, Amortized Cost
Available for sale Securities, Amortized Cost	$ 378,022	$ 365,140
Available for Sale, Fair Value
Available for sale Securities, Fair Value, Total	389,824	367,249
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	438,656	477,507
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	451,920	$ 478,749
Debt Securities
Available for Sale, Amortized Cost
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	24,601
Available for Sale, Amortized Cost, Due after five to ten years	96,138
Available for Sale, Amortized Cost, Due after ten years	242,916
Available for sale Securities, Amortized Cost	363,655
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	25,143
Available for Sale, Fair Value, Due after five to ten years	99,926
Available for Sale, Fair Value, Due after ten years	249,920
Available for sale Securities, Fair Value, Total	374,989
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	32
Held to Maturity, Amortized Cost, Due after one year to five years	16,186
Held to Maturity, Amortized Cost, Due after five to ten years	26,469
Held to Maturity, Amortized Cost, Due after ten years	395,969
Held to maturity Securities, Amortized Cost	438,656
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	32
Held to Maturity, Fair Value, Due after one year to five years	16,973
Held to Maturity, Fair Value, Due after five to ten years	27,595
Held to Maturity, Fair Value, Due after ten years	407,320
Held to Maturity, Fair Value, Total	451,920
Equity securities
Available for Sale, Amortized Cost
Available for Sale, Amortized Cost, Marketable equity securities	14,367
Available for Sale, Fair Value
Available for Sale, Fair Value, Marketable equity securities	14,835
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	$ 0