Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 12,773
Held to Maturity, Due after one year through five years, Amortized Cost	165,519
Held to Maturity, Due after five years through ten years, Amortized Cost	527,907
Held to Maturity, Due after ten years, Amortized Cost	792,945
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	530,861
Held-to-maturity, Equity Securities, Amortized Cost	0
Held to Maturity, Amortized Cost	2,030,005	$ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value	12,847
Held to Maturity, Due after one year through five years, Estimated Fair Value	169,970
Held to Maturity, Due after five years through ten years, Estimated Fair Value	541,249
Held to Maturity, Due after ten years, Estimated Fair Value	803,091
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	521,518
Held-to-maturity, Equity Securities, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	2,048,675	1,116,953
Available for Sale, Due in one year or less, Amortized Cost	508,575
Available for Sale, Due after one year through five years, Amortized Cost	1,317,774
Available for Sale, Due after five years through ten years, Amortized Cost	451,885
Available for Sale, Due after ten years, Amortized Cost	6,380,393
Available For Sale, Residential mortgage-backed securities, Amortized Cost	2,176,275
Available for Sale, Equity securities, Amortized Cost	42,867
Available for Sale, Amortized Cost	10,877,769	11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value	509,404
Available for Sale, Due after one year through five years, Estimated Fair Value	1,344,035
Available for Sale, Due after five years through ten years, Estimated Fair Value	478,800
Available for Sale, Due after ten years, Estimated Fair Value	6,686,891
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,207,594
Available for Sale, Equity securities, Estimated Fair Value	42,867
Available for Sale, Estimated Fair Value	$ 11,269,591	$ 11,387,321

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