Fair Value Measurement (Loans Held for Sale Table) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 17,813		$ 23,683		$ 17,540
Aggregate Fair Value
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	17,813		23,683		17,540
Contractual Balance
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	17,179		22,765		16,635
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ 634	[1]	$ 918	[1]	$ 905

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