Fair Value Measurement (Loans Held for Sale Table) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 14,459		$ 23,683		$ 42,447
Aggregate Fair Value [Member]
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	14,459		23,683		42,447
Contractual Balance [Member]
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	13,960		22,765		41,542
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$ 499	[1]	$ 918	[1]	$ 905

[1] (a) These changes are included in loan sales and servicing income.