Fair Value Measurement (Summary of Change in Fair Value Carrying Amount of Residential Mortgages ) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014		Jun. 30, 2014
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 8,302	$ 14,389		$ 21,632
Aggregate Fair Value
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure		14,389		21,632
Contractual Balance
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	8,155	13,873		20,886
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ 147	$ 516	[1]	$ 746

[1] These changes are included in "Loan sales and servicing income" in the Consolidated Statements of Income.