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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
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Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | $ 1,023 |  |  |
2015 | 4,090 |  |  |
2016 | 4,083 |  |  |
2017 | 4,070 |  |  |
2018 | 4,030 |  |  |
Thereafter | 12,200 |  |  |
Amortization expense | 29,496 | 28,879 | 28,121 | 26,983
Originated MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 704 |  |  |
2015 | 2,815 |  |  |
2016 | 2,808 |  |  |
2017 | 2,802 |  |  |
2018 | 2,775 |  |  |
Thereafter | 9,071 |  |  |
Amortization expense | 20,975 |  |  |
Purchased MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 319 |  |  |
2015 | 1,275 |  |  |
2016 | 1,275 |  |  |
2017 | 1,268 |  |  |
2018 | 1,255 |  |  |
Thereafter | 3,129 |  |  |
Amortization expense | $ 8,521 |  |  |

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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