Borrowings - Schedule of Securites Sold Under Repurchase Agreements (Details) (Securities Sold Under Repurchase Agreements, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Securities Sold Under Repurchase Agreements
Debt Instrument [Line Items]
Maximum Amount Outstanding During Period	$ 160,127	$ 162,315
Average Outstanding Amount	$ 144,555	$ 120,415