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Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 545,542 | $ 561,838 |  |
Resell agreements | 159,967 | 18,742 |  |
Cash and cash equivalents | 5,053,047 | 4,141,445 | $ 3,591,523 | $ 4,364,123
Total assets | 31,747,880 | 30,196,319 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,184 | 136,127 |  |
Subordinated notes, net of unamortized issuance costs | 98,552 | 99,990 |  |
Accrued interest payable and other liabilities | 195,068 | 169,107 |  |
Total liabilities | 28,450,017 | 27,193,791 |  |
Shareholders’ Equity | 3,297,863 | 3,002,528 | $ 2,890,343 | $ 2,851,403
Total liabilities and shareholders’ equity | 31,747,880 | 30,196,319 |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 9,301 | 9,854 |  |
Resell agreements | 256,000 | 279,270 |  |
Cash and cash equivalents | 265,301 | 289,124 |  |
Investment in subsidiaries | 3,274,921 | 2,949,346 |  |
Accrued interest receivable and other assets | 3,006 | 5,799 |  |
Total assets | 3,543,228 | 3,244,269 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,184 | 136,127 |  |
Subordinated notes, net of unamortized issuance costs | 98,552 | 99,990 |  |
Accrued interest payable and other liabilities | 10,629 | 5,624 |  |
Total liabilities | 245,365 | 241,741 |  |
Shareholders’ Equity | 3,297,863 | 3,002,528 |  |
Total liabilities and shareholders’ equity | $ 3,543,228 | $ 3,244,269 |  |

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- Definition Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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