Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for Sale, Amortized Cost
Available for sale Securities, Amortized Cost	$ 370,593	$ 343,093
Available for Sale, Fair Value
Available for sale Securities, Fair Value, Total	375,001	348,554
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	428,339	375,453
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	431,778	$ 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	46,469
Available for Sale, Amortized Cost, Due after five to ten years	92,147
Available for Sale, Amortized Cost, Due after ten years	218,776
Available for sale Securities, Amortized Cost	357,392
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	47,097
Available for Sale, Fair Value, Due after five to ten years	92,354
Available for Sale, Fair Value, Due after ten years	222,106
Available for sale Securities, Fair Value, Total	361,557
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	5,226
Held to Maturity, Amortized Cost, Due after one year to five years	149
Held to Maturity, Amortized Cost, Due after five to ten years	29,960
Held to Maturity, Amortized Cost, Due after ten years	393,004
Held to maturity Securities, Amortized Cost	428,339
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	5,293
Held to Maturity, Fair Value, Due after one year to five years	152
Held to Maturity, Fair Value, Due after five to ten years	30,547
Held to Maturity, Fair Value, Due after ten years	395,786
Held to Maturity, Fair Value, Total	431,778
Equity securities
Available for Sale, Amortized Cost
Available for Sale, Amortized Cost, Marketable equity securities	13,201
Available for Sale, Fair Value
Available for Sale, Fair Value, Marketable equity securities	13,444
Held to Maturity, Amortized Cost
Held to maturity Securities, Amortized Cost	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Total	$ 0