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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
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Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | $ 2,156 |  |  |
2015 | 4,312 |  |  |
2016 | 4,288 |  |  |
2017 | 4,232 |  |  |
2018 | 4,107 |  |  |
Thereafter | 10,020 |  |  |
Amortization expense | 29,115 | 28,879 | 27,665 | 26,983
Originated MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 1,452 |  |  |
2015 | 2,905 |  |  |
2016 | 2,895 |  |  |
2017 | 2,868 |  |  |
2018 | 2,768 |  |  |
Thereafter | 7,376 |  |  |
Amortization expense | 20,264 |  |  |
Purchased MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 704 |  |  |
2015 | 1,407 |  |  |
2016 | 1,393 |  |  |
2017 | 1,364 |  |  |
2018 | 1,339 |  |  |
Thereafter | 2,644 |  |  |
Amortization expense | $ 8,851 |  |  |

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