Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Valuation allowance:
Servicing Asset at Fair Value, Amount	$ 46,000,000us-gaap_ServicingAssetAtFairValueAmount	$ 49,300,000us-gaap_ServicingAssetAtFairValueAmount
Amortization [Abstract]
2014	247,000
Mortgage
Amortized cost:
Balance at beginning of year	42,452,000	39,737,000
Originations of mortgage servicing rights	5,047,000	12,072,000
Amortization expense	(5,351,000)	(9,357,000)
Balance at end of year	42,148,000	42,452,000
Valuation allowance:
Balance at beginning of year	0	(3,680,000)
Reversals	0	3,680,000
Balance at end of year	0	0
Net MSRs at end of year	42,148,000	42,452,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Period Increase (Decrease)	0
Amortization [Abstract]
2014	10,224,000
2015	9,028,000
2016	7,717,000
2017	6,283,000
2018	$ 4,717,000

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

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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.

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

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