Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 58,032
Held to Maturity, Due after one year through five years, Amortized Cost	128,835
Held to Maturity, Due after five years through ten years, Amortized Cost	505,528
Held to Maturity, Due after ten years, Amortized Cost	382,228
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	2,656
Held-to-maturity Securities, Equity Securities, Amortized cost	0
Held to Maturity, Amortized Cost	1,077,279	$ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value	58,525
Held to Maturity, Due after one year through five years, Estimated Fair Value	131,725
Held to Maturity, Due after five years through ten years, Estimated Fair Value	514,331
Held to Maturity, Due after ten years, Estimated Fair Value	390,668
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	2,609
Held-to-maturity Securities, Equity Securities, Fair Value	0
Held to Maturity, Estimated Fair Value	1,097,858	1,116,953
Available-for-sale Securities, Due in one year or less, Amortized Cost	2,606,267
Available for Sale, Due after one year through five years, Amortized Cost	1,662,791
Available for Sale, Due after five years through ten years, Amortized Cost	375,007
Available for Sale, Due after ten years, Amortized Cost	5,941,965
Available for Sale, Residential mortgage-backed securities, Amortized Cost	1,210,179
Available-for-sale Securities, Equity Securities, Amortized cost	42,734
Available for Sale, Amortized Cost	11,838,943	11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value	2,593,167
Available for Sale, Due after one year through five years, Estimated Fair Value	1,673,779
Available for Sale, Due after five years through ten years, Estimated Fair Value	390,443
Available for Sale, Due after ten years, Estimated Fair Value	6,086,405
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	1,227,435
Available For Sale Securities Equity Securities Fair Value	42,734
Available for Sale, Estimated Fair Value	$ 12,013,963	$ 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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