Fair Value Measurement (Summary of Change in Fair Value Carrying Amount of Residential Mortgages ) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 3,568	$ 13,428		$ 7,143
Aggregate Fair Value
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	4,657	14,389		7,143
Contractual Balance
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	4,489	13,873		6,955
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ 168	$ 516	[1]	$ 188

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