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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Contingencies And Commitments [Line Items] |  |
Commitments to extend credit | $ 744,000,000 | $ 694,400,000
Obligations under letters of credit | 35,100,000 | 34,600,000
Reserve for credit risk for undisbursed commitments | 7,200,000 | $ 7,700,000
Available lines of credit | 3,230,000,000 |
Litigation reserves | 0 |
Secured [Member] |  |
Contingencies And Commitments [Line Items] |  |
Available lines of credit | $ 2,840,000,000 |

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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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