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Core Deposit Intangibles in Amounts of One Hundred Thousand or more, by Remaining Term to Maturity (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
CDs of $100,000 or More Maturing Within, 3 Months or Less $ 1,333,531
CDs of $100,000 or More Maturing Within, Over 3 to 6 Months 1,495,368
CDs of $100,000 or More Maturing Within, Over 6 to 12 Months 1,064,316
CDs of $100,000 or More Maturing Within, Over 12 Months 1,595,643
CDs of $100,000 or More Maturing Within, Total $ 5,488,858