Loan Servicing (Activity For MSRs And Related Valuation Allowance) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Servicing Asset at Amortized Value, Balance [Roll Forward]
Carrying amount, net, beginning of period	$ 7,763	$ 9,301	$ 9,301
Additions	1,111	562
Amortization	(815)	(888)
Changes in valuation inputs & assumptions	62	0
Carrying amount, net, end of period	8,121	8,975	7,763
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance, beginning of period	2,324	1,021	1,021
Changes in valuation allowance	(62)	0	0
Valuation allowance, end of period	$ 2,262	$ 1,021	$ 2,324

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ 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

The amount of valuation allowance applied to adjust the carrying value of servicing assets.

+ References+ Details

- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References+ Details

- Definition

New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets.

+ References+ Details