Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 25,324
Held to Maturity, Due after one year through five years, Amortized Cost	172,218
Held to Maturity, Due after five years through ten years, Amortized Cost	1,013,101
Held to Maturity, Due after ten years, Amortized Cost	773,706
Held to Maturity, Amortized Cost	1,984,349	$ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value	25,579
Held to Maturity, Due after one year through five years, Estimated Fair Value	176,731
Held to Maturity, Due after five years through ten years, Estimated Fair Value	1,060,630
Held to Maturity, Due after ten years, Estimated Fair Value	794,939
Held to Maturity, Estimated Fair Value	2,057,879	2,048,675
Available-for-sale Securities, Due in one year or less, Amortized Cost	284,689
Available for Sale, Due after one year through five years, Amortized Cost	1,372,248
Available for Sale, Due after five years through ten years, Amortized Cost	654,275
Available for Sale, Due after ten years, Amortized Cost	7,600,913
Available for Sale, Amortized Cost	9,955,026	10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value	286,538
Available for Sale, Due after one year through five years, Estimated Fair Value	1,435,202
Available for Sale, Due after five years through ten years, Estimated Fair Value	693,124
Available for Sale, Due after ten years, Estimated Fair Value	8,010,212
Securities available for sale, estimated fair value	10,467,977	11,269,591
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Due in one year or less, Amortized Cost	33,964
Available for Sale, Due after one year through five years, Amortized Cost	1,083,559
Available for Sale, Due after five years through ten years, Amortized Cost	0
Available for Sale, Due after ten years, Amortized Cost	0
Available for Sale, Amortized Cost	1,117,523	1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value	34,181
Available for Sale, Due after one year through five years, Estimated Fair Value	1,133,083
Available for Sale, Due after five years through ten years, Estimated Fair Value	0
Available for Sale, Due after ten years, Estimated Fair Value	0
Securities available for sale, estimated fair value	1,167,264	1,948,133
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	0
Held to Maturity, Due after one year through five years, Amortized Cost	332
Held to Maturity, Due after five years through ten years, Amortized Cost	516,866
Held to Maturity, Due after ten years, Amortized Cost	13,198
Held to Maturity, Amortized Cost	530,396	530,861
Held to Maturity, Due in one year or less, Estimated Fair Value	0
Held to Maturity, Due after one year through five years, Estimated Fair Value	335
Held to Maturity, Due after five years through ten years, Estimated Fair Value	553,409
Held to Maturity, Due after ten years, Estimated Fair Value	13,886
Held to Maturity, Estimated Fair Value	567,630	521,518
Available-for-sale Securities, Due in one year or less, Amortized Cost	236
Available for Sale, Due after one year through five years, Amortized Cost	68,185
Available for Sale, Due after five years through ten years, Amortized Cost	5,859
Available for Sale, Due after ten years, Amortized Cost	1,935,243
Available for Sale, Amortized Cost	2,009,523	2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value	249
Available for Sale, Due after one year through five years, Estimated Fair Value	70,834
Available for Sale, Due after five years through ten years, Estimated Fair Value	6,379
Available for Sale, Due after ten years, Estimated Fair Value	2,012,484
Securities available for sale, estimated fair value	2,089,946	2,207,594
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	25,324
Held to Maturity, Due after one year through five years, Amortized Cost	170,386
Held to Maturity, Due after five years through ten years, Amortized Cost	496,235
Held to Maturity, Due after ten years, Amortized Cost	760,508
Held to Maturity, Amortized Cost	1,452,453	1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value	25,579
Held to Maturity, Due after one year through five years, Estimated Fair Value	174,896
Held to Maturity, Due after five years through ten years, Estimated Fair Value	507,221
Held to Maturity, Due after ten years, Estimated Fair Value	781,053
Held to Maturity, Estimated Fair Value	1,488,749	1,525,657
Available-for-sale Securities, Due in one year or less, Amortized Cost	250,489
Available for Sale, Due after one year through five years, Amortized Cost	220,504
Available for Sale, Due after five years through ten years, Amortized Cost	648,416
Available for Sale, Due after ten years, Amortized Cost	5,665,670
Available for Sale, Amortized Cost	6,785,079	6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value	252,108
Available for Sale, Due after one year through five years, Estimated Fair Value	231,285
Available for Sale, Due after five years through ten years, Estimated Fair Value	686,745
Available for Sale, Due after ten years, Estimated Fair Value	5,997,728
Securities available for sale, estimated fair value	7,167,866	7,070,997
Other Investments [Member]
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	0
Held to Maturity, Due after one year through five years, Amortized Cost	1,500
Held to Maturity, Due after five years through ten years, Amortized Cost	0
Held to Maturity, Due after ten years, Amortized Cost	0
Held to Maturity, Amortized Cost	1,500	1,500
Held to Maturity, Due in one year or less, Estimated Fair Value	0
Held to Maturity, Due after one year through five years, Estimated Fair Value	1,500
Held to Maturity, Due after five years through ten years, Estimated Fair Value	0
Held to Maturity, Due after ten years, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	1,500	1,500
Available-for-sale Securities, Due in one year or less, Amortized Cost	0
Available for Sale, Due after one year through five years, Amortized Cost	0
Available for Sale, Due after five years through ten years, Amortized Cost	0
Available for Sale, Due after ten years, Amortized Cost	0
Available for Sale, Amortized Cost	42,901	42,867
Available for Sale, Due in one year or less, Estimated Fair Value	0
Available for Sale, Due after one year through five years, Estimated Fair Value	0
Available for Sale, Due after five years through ten years, Estimated Fair Value	0
Available for Sale, Due after ten years, Estimated Fair Value	0
Securities available for sale, estimated fair value	$ 42,901	$ 42,867

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