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Loans sales and securitizations (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Residential Mortgage [Member]
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| Summarizes activity relating to loans sold securitized with servicing retained | ||||||||||
| Loans sold with servicing retained | $ 654,747,000 | $ 853,287,000 | $ 1,703,056,000 | $ 2,603,414,000 | ||||||
| Pretax gains resulting from above loan sales | 16,781,000 | [1] | 23,224,000 | [1] | 43,853,000 | [1] | 91,519,000 | [1] | ||
| Summarize the changes in MSRs using the fair value method | ||||||||||
| Fair value, beginning of period | 26,747,000 | 37,544,000 | 34,236,000 | 35,202,000 | ||||||
| Change in fair value during the period due to: | ||||||||||
| Time decay | 467,000 | 727,000 | 1,848,000 | 1,961,000 | ||||||
| Payoffs | 1,343,000 | 3,015,000 | 4,869,000 | 9,774,000 | ||||||
| Changes in valuation inputs or assumptions | 501,000 | 304,000 | (2,081,000) | 10,639,000 | ||||||
| Fair value, end of period | 25,438,000 | 34,106,000 | 25,438,000 | 34,106,000 | ||||||
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Residential Mortgage [Member] | Fair value method
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| Change in fair value during the period due to: | ||||||||||
| Weighted-average life (in years) | 5 years 2 months 0 days | 4 years 2 months 0 days | 5 years 2 months 0 days | 4 years 2 months 0 days | ||||||
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Residential Mortgage [Member] | Amortization method
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| Change in fair value during the period due to: | ||||||||||
| Weighted-average life (in years) | 6 years 10 months 0 days | 6 years 5 months 0 days | 6 years 10 months 0 days | 6 years 5 months 0 days | ||||||
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Automobile Loan [Member] | Amortization method
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| Change in fair value during the period due to: | ||||||||||
| Weighted-average life (in years) | 3 years 0 months 0 days | 3 years 10 months 0 days | 3 years 0 months 0 days | 3 years 10 months 0 days | ||||||
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Small Business Association (SBA) Loan [Member]
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| Summarizes activity relating to loans sold securitized with servicing retained | ||||||||||
| Loans sold with servicing retained | 63,470,000 | 49,808,000 | 149,571,000 | 116,094,000 | ||||||
| Pretax gains resulting from above loan sales | $ 7,432,000 | [1] | $ 4,718,000 | [1] | $ 17,204,000 | [1] | $ 12,059,000 | [1] | ||
| Change in fair value during the period due to: | ||||||||||
| Weighted-average life (in years) | 3 years 6 months 0 days | |||||||||
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