Mortgage Servicing Rights (Details 2) (Mortgage Servicing Rights., USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Mortgage Servicing Rights.
Change in Carrying Value of Mortgage Servicing Rights Accounted for Under the Amortization Method, Net of a Valuation Allowance
Balance at the Beginning of the Period	$ 16,227	$ 11,275	$ 15,153	$ 10,638
Servicing Rights that Resulted From Asset Transfers	473	896	1,962	1,841
Amortization	(480)	(365)	(895)	(673)
Balance at the End of the Period	16,220	11,806	16,220	11,806
Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method
Balance at the Beginning of the Period	22,661	16,453	20,340	14,853
Balance at the End of the Period	$ 21,483	$ 15,044	$ 21,483	$ 15,044

Amortized carrying amount (balance) as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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+ Details

- Definition

The value of new servicing assets, subsequently measured at amortized value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References+ Details

- Definition

Decreases in the value of servicing assets due to the periodic amortization in proportion to and over the period of estimated net servicing income.

+ References+ Details

- Definition

Fair value of the servicing asset that has been amortized as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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+ Details