Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 25,254
Held to Maturity, Due after one year through five years, Amortized Cost	166,412
Held to Maturity, Due after five years through ten years, Amortized Cost	530,808
Held to Maturity, Due after ten years, Amortized Cost	295,892
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	2,472
Held-to-maturity Securities, Equity Securities, Amortized cost	0
Held to Maturity, Amortized Cost	1,020,838	$ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value	25,418
Held to Maturity, Due after one year through five years, Estimated Fair Value	170,675
Held to Maturity, Due after five years through ten years, Estimated Fair Value	543,464
Held to Maturity, Due after ten years, Estimated Fair Value	305,371
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	2,495
Held-to-maturity Securities, Equity Securities, Fair Value	0
Held to Maturity, Estimated Fair Value	1,047,423	1,116,953
Available-for-sale Securities, Due in one year or less, Amortized Cost	1,882,023
Available for Sale, Due after one year through five years, Amortized Cost	1,328,841
Available for Sale, Due after five years through ten years, Amortized Cost	453,192
Available for Sale, Due after ten years, Amortized Cost	6,074,419
Available for Sale, Residential mortgage-backed securities, Amortized Cost	2,198,466
Available-for-sale Securities, Equity Securities, Amortized cost	42,825
Available for Sale, Amortized Cost	11,979,766	11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value	1,881,435
Available for Sale, Due after one year through five years, Estimated Fair Value	1,356,833
Available for Sale, Due after five years through ten years, Estimated Fair Value	480,892
Available for Sale, Due after ten years, Estimated Fair Value	6,418,009
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,240,452
Available For Sale Securities Equity Securities Fair Value	42,825
Available for Sale, Estimated Fair Value	$ 12,420,446	$ 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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