Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 72,476
Held to Maturity, Due after one year through five years, Amortized Cost	122,796
Held to Maturity, Due after five years through ten years, Amortized Cost	483,934
Held to Maturity, Due after ten years, Amortized Cost	424,114
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	2,737
Held-to-maturity, Equity Securities, Amortized Cost	0
Held to Maturity, Amortized Cost	1,106,057	$ 1,432,098
Held to Maturity, Due in one year or less, Estimated Fair Value	73,139
Held to Maturity, Due after one year through five years, Estimated Fair Value	124,738
Held to Maturity, Due after five years through ten years, Estimated Fair Value	487,202
Held to Maturity, Due after ten years, Estimated Fair Value	429,214
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	2,660
Held-to-maturity, Equity Securities, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	1,116,953	1,455,791
Available for Sale, Due in one year or less, Amortized Cost	2,235,652
Available for Sale, Due after one year through five years, Amortized Cost	1,858,631
Available for Sale, Due after five years through ten years, Amortized Cost	486,008
Available for Sale, Due after ten years, Amortized Cost	5,964,258
Available For Sale, Residential mortgage-backed securities, Amortized Cost	823,208
Available for Sale, Equity securities, Amortized Cost	42,690
Available for Sale, Amortized Cost	11,410,447	10,329,951
Available for Sale, Due in one year or less, Estimated Fair Value	2,215,867
Available for Sale, Due after one year through five years, Estimated Fair Value	1,853,056
Available for Sale, Due after five years through ten years, Estimated Fair Value	492,435
Available for Sale, Due after ten years, Estimated Fair Value	5,953,533
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	829,740
Available for Sale, Equity securities, Estimated Fair Value	42,690
Available for Sale, Estimated Fair Value	$ 11,387,321	$ 10,489,009

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