Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available for Sale, Amortized Cost
Available for sale Securities, Amortized Cost	$ 359,419	$ 343,093
Available for Sale, Fair Value
Available for sale Securities, Fair Value, Total	365,792	348,554
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	448,139	375,453
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	455,776	$ 379,699
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	42,709
Available for Sale, Amortized Cost, Due after five to ten years	81,841
Available for Sale, Amortized Cost, Due after ten years	221,669
Available for sale Securities, Amortized Cost	346,219
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	43,495
Available for Sale, Fair Value, Due after five to ten years	83,361
Available for Sale, Fair Value, Due after ten years	225,981
Available for sale Securities, Fair Value, Total	352,837
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	5,225
Held to Maturity, Amortized Cost, Due after one year to five years	118
Held to Maturity, Amortized Cost, Due after five to ten years	29,013
Held to Maturity, Amortized Cost, Due after ten years	413,783
Held to maturity Securities, Amortized Cost	448,139
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	5,271
Held to Maturity, Fair Value, Due after one year to five years	120
Held to Maturity, Fair Value, Due after five to ten years	29,954
Held to Maturity, Fair Value, Due after ten years	420,431
Held to Maturity, Fair Value, Total	455,776
Equity securities
Available for Sale, Amortized Cost
Available for Sale, Amortized Cost, Marketable equity securities	13,200
Available for Sale, Fair Value
Available for Sale, Fair Value, Marketable equity securities	12,955
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	$ 0