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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
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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Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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