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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Nov. 28, 2016 | Oct. 26, 2016 | Dec. 31, 2016 | Dec. 31, 2015
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Contingencies And Commitments [Line Items] |  |  |  |
Commitments to extend credit |  |  | $ 844,300,000 | $ 744,000,000
Obligations under letters of credit |  |  | 36,500,000 | 35,100,000
Reserve for credit risk for undisbursed commitments |  |  | 6,700,000 | $ 7,200,000
Available lines of credit |  |  | 3,170,000,000 |
Litigation settlement payment | $ 1,500,000 | $ 6,200,000 |  |
Litigation accrual |  |  | 1,500,000 |
Secured [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Available lines of credit |  |  | $ 2,780,000,000 |

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- Definition Commitments to extend credit. + References No definition available. + Details
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- Definition Contingencies And Commitments [Line Items] + References No definition available. + Details
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- Definition Reserve for undisbursed commitments. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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