Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Amortized Cost:
Servicing Asset at Fair Value, Amount	$ 43,600,000us-gaap_ServicingAssetAtFairValueAmount
Mortgages [Member]
Amortized Cost:
Valuation Allowance for Impairment of Recognized Servicing Assets, Period Increase (Decrease)	0
Residential Mortgage [Member]
Amortized Cost:
Balance at beginning of period	42,148,000	42,452,000
Originations of mortgage servicing rights	1,557,000	1,115,000
Amortization	(1,902,000)	(1,899,000)
Balance at end of period	$ 41,803,000	$ 41,668,000

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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

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-Name Accounting Standards Codification

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- Definition

Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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

-Publisher FASB

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Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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- Definition

The net increase (decrease) in the valuation allowance for servicing assets subsequently measured using the amortization method.

+ References

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