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Commercial Mortgage Banking - Summary of Changes in Carrying Value of Mortgage Servicing Rights (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |  |
Balance at beginning of year | $ 28,879 us-gaap_ServicingAssetAtAmortizedValue |  | $ 26,983 us-gaap_ServicingAssetAtAmortizedValue |
Originations | 5,956 us-gaap_ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount | [1] | 7,351 us-gaap_ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount | [1]
Purchases | 345 us-gaap_ServicingAssetAtAmortizedValueAdditions |  | 1,344 us-gaap_ServicingAssetAtAmortizedValueAdditions |
Disposals | (2,221)us-gaap_ServicingAssetAtAmortizedValueDisposals | [1] | (4,918)us-gaap_ServicingAssetAtAmortizedValueDisposals | [1]
Amortization expense | (2,819)us-gaap_ServicingAssetAtAmortizedValueAmortization1 |  | (1,881)us-gaap_ServicingAssetAtAmortizedValueAmortization1 |
Balance at end of year | $ 30,140 us-gaap_ServicingAssetAtAmortizedValue |  | $ 28,879 us-gaap_ServicingAssetAtAmortizedValue |
[1] | Includes refinancings

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of additions from purchases, assumption or transfer to 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 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of amortization 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 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount conveyed to unrelated parties of contract to 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 50 -Paragraph 4 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of other increase (decrease) to 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 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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