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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 125,305 $ 459,960
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (583) (5,088)
Estimated fair value, 12 months or more 2,061,847 7,048,346
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (29,640) (198,354)
Held to maturity, Estimated fair value, Less than 12 months 2,727 625,657
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (5) (1,228)
Held to maturity, Estimated fair value, 12 months or more 194,891 2,137,792
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (20,168) (76,461)
Total investment securities, fair value less than 12 months 128,032 1,085,617
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (588) (6,316)
Total of investment securities, fair value, 12 Months or More 2,256,738 9,186,138
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (49,808) (274,815)
U.S. Treasury and Federal Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 1,406 273
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (7) (2)
Estimated fair value, 12 months or more 2,893 1,335,559
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (9) (9,849)
Held to maturity, Estimated fair value, Less than 12 months   446,303
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses   (239)
Obligations of States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   629
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (5)
Estimated fair value, 12 months or more 277  
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (3)  
Held to maturity, Estimated fair value, 12 months or more   3,126
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses   (12)
Government Issued or Guaranteed [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 117,299 405,558
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (222) (2,892)
Estimated fair value, 12 months or more 2,002,364 5,646,773
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (21,385) (179,211)
Held to maturity, Estimated fair value, Less than 12 months 2,727 179,354
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (5) (989)
Held to maturity, Estimated fair value, 12 months or more 145,235 2,082,723
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (1,987) (54,122)
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 6,600 53,478
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (354) (2,187)
Estimated fair value, 12 months or more 56,313 66,014
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (8,243) (9,294)
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   22
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (2)
Held to maturity, Estimated fair value, 12 months or more 49,656 51,943
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ (18,181) $ (22,327)