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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
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Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | $ 4,056 |  |  |
2015 | 4,056 |  |  |
2016 | 4,035 |  |  |
2017 | 3,985 |  |  |
2018 | 3,869 |  |  |
Thereafter | 9,225 |  |  |
Amortization expense | 29,226 | 28,879 | 27,187 | 26,983
Originated MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 2,702 |  |  |
2015 | 2,702 |  |  |
2016 | 2,693 |  |  |
2017 | 2,669 |  |  |
2018 | 2,577 |  |  |
Thereafter | 6,687 |  |  |
Amortization expense | 20,030 |  |  |
Purchased MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 1,354 |  |  |
2015 | 1,354 |  |  |
2016 | 1,342 |  |  |
2017 | 1,316 |  |  |
2018 | 1,292 |  |  |
Thereafter | 2,538 |  |  |
Amortization expense | $ 9,196 |  |  |

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