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Commitments And Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |
Securities available for sale, mortgaged-related securities, pledged | $ 1,263,227 |  |
Securities held to maturity, mortgaged related securities, pledged | 1,600,000 | $ 346,700 |
Securities available for sale, other securities, pledged | 346,000 |  |
Loans pledged to FHLB, collateral for wholesale borrowings | 30,100,000 | 29,400,000 |
Commitments | 2,274,678 |  |
Rental expense under non-cancelable operating lease and license agreements | 33,200 | 32,600 | $ 32,800
Rental income on bank-owned properties, netted in occupancy and equipment expense | 9,500 | 7,100 | $ 3,700
GNMA Securities |  |  |
Loss Contingencies [Line Items] |  |  |
Purchase commitments | 29,400 |  |
Total loans |  |  |
Loss Contingencies [Line Items] |  |  |
Commitments | 1,935,275 | 2,100,000 |
Commercial, performance stand-by, and financial stand-by letters of credit |  |  |
Loss Contingencies [Line Items] |  |  |
Commitments | $ 339,403 | $ 324,300 |

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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + 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(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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