Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 21,334
Held to Maturity, Due after one year through five years, Amortized Cost	128,125
Held to Maturity, Due after five years through ten years, Amortized Cost	534,695
Held to Maturity, Due after ten years, Amortized Cost	348,591
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	2,554
Held-to-maturity Securities, Equity Securities, Amortized cost	0
Held to Maturity, Amortized Cost	1,035,299	$ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value	21,546
Held to Maturity, Due after one year through five years, Estimated Fair Value	131,517
Held to Maturity, Due after five years through ten years, Estimated Fair Value	547,279
Held to Maturity, Due after ten years, Estimated Fair Value	359,073
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	2,563
Held-to-maturity Securities, Equity Securities, Fair Value	0
Held to Maturity, Estimated Fair Value	1,061,978	1,116,953
Available-for-sale Securities, Due in one year or less, Amortized Cost	1,974,510
Available for Sale, Due after one year through five years, Amortized Cost	1,427,453
Available for Sale, Due after five years through ten years, Amortized Cost	400,327
Available for Sale, Due after ten years, Amortized Cost	5,888,691
Available for Sale, Residential mortgage-backed securities, Amortized Cost	2,212,761
Available-for-sale Securities, Equity Securities, Amortized cost	42,780
Available for Sale, Amortized Cost	11,946,522	11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value	1,968,237
Available for Sale, Due after one year through five years, Estimated Fair Value	1,454,226
Available for Sale, Due after five years through ten years, Estimated Fair Value	421,390
Available for Sale, Due after ten years, Estimated Fair Value	6,145,168
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,247,712
Available For Sale Securities Equity Securities Fair Value	42,780
Available for Sale, Estimated Fair Value	$ 12,279,513	$ 11,387,321

Available For Sale Securities Equity Securities Fair Value

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Mortgage-backed securities Available For Sale, Amortized Cost

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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