Fair Value Measurement (Loans Held for Sale Table) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 22,855		$ 23,683		$ 19,018
Aggregate Fair Value [Member]
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	22,855		23,683		19,018
Contractual Balance [Member]
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	23,220		22,765		18,267
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ (365)	[1]	$ 918	[1]	$ 751

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