Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Fair Value Measurements
Transfers of assets from level 1 to level 2	$ 0
Transfers of assets from level 2 to level 1	0
Transfers of liabilities from level 1 to level 2	0
Transfers of liabilities from level 2 to level 1	0
Changes in Fair Value for Assets and Liabilities Reported at Fair Value under Fair Value Option
Net Losses	120,545us-gaap_GainLossOnSalesOfLoansNet	79,111us-gaap_GainLossOnSalesOfLoansNet
Other Noninterest Income	24,479us-gaap_NoninterestIncomeOther	16,991us-gaap_NoninterestIncomeOther
Loans held for sale
Changes in Fair Value for Assets and Liabilities Reported at Fair Value under Fair Value Option
Net Losses	(6,695)	4,518
Total Changes in Fair Value	(6,695)	4,518
MSR
Changes in Fair Value for Assets and Liabilities Reported at Fair Value under Fair Value Option
Net Losses	(7,197)	2,358
Total Changes in Fair Value	$ (7,197)	$ 2,358

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

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

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-Name Accounting Standards Codification

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-SubTopic 10

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

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

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Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

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

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