Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 25,717
Held to Maturity, Due after one year through five years, Amortized Cost	341,781
Held to Maturity, Due after five years through ten years, Amortized Cost	942,200
Held to Maturity, Due after ten years, Amortized Cost	659,428
Held to Maturity, Amortized Cost	1,969,126	$ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value	25,991
Held to Maturity, Due after one year through five years, Estimated Fair Value	355,639
Held to Maturity, Due after five years through ten years, Estimated Fair Value	1,000,148
Held to Maturity, Due after ten years, Estimated Fair Value	691,663
Held to Maturity, Estimated Fair Value	2,073,441	2,048,675
Available-for-sale Securities, Due in one year or less, Amortized Cost	275,214
Available for Sale, Due after one year through five years, Amortized Cost	1,552,260
Available for Sale, Due after five years through ten years, Amortized Cost	663,488
Available for Sale, Due after ten years, Amortized Cost	7,403,995
Available for Sale, Amortized Cost	9,937,236	10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value	277,201
Available for Sale, Due after one year through five years, Estimated Fair Value	1,633,461
Available for Sale, Due after five years through ten years, Estimated Fair Value	720,056
Available for Sale, Due after ten years, Estimated Fair Value	7,933,699
Securities available for sale, estimated fair value	10,606,696	11,269,591
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Due in one year or less, Amortized Cost	33,986
Available for Sale, Due after one year through five years, Amortized Cost	1,083,881
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	1,117,867	1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value	34,067
Available for Sale, Due after one year through five years, Estimated Fair Value	1,129,568
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	1,163,635	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	285
Held to Maturity, Due after five years through ten years, Amortized Cost	516,618
Held to Maturity, Due after ten years, Amortized Cost	12,965
Held to Maturity, Amortized Cost	529,868	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	287
Held to Maturity, Due after five years through ten years, Estimated Fair Value	560,606
Held to Maturity, Due after ten years, Estimated Fair Value	14,218
Held to Maturity, Estimated Fair Value	575,111	521,518
Available-for-sale Securities, Due in one year or less, Amortized Cost	126
Available for Sale, Due after one year through five years, Amortized Cost	57,223
Available for Sale, Due after five years through ten years, Amortized Cost	5,424
Available for Sale, Due after ten years, Amortized Cost	1,988,913
Available for Sale, Amortized Cost	2,051,686	2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value	133
Available for Sale, Due after one year through five years, Estimated Fair Value	59,793
Available for Sale, Due after five years through ten years, Estimated Fair Value	5,967
Available for Sale, Due after ten years, Estimated Fair Value	2,065,394
Securities available for sale, estimated fair value	2,131,287	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	25,717
Held to Maturity, Due after one year through five years, Amortized Cost	339,996
Held to Maturity, Due after five years through ten years, Amortized Cost	425,582
Held to Maturity, Due after ten years, Amortized Cost	646,463
Held to Maturity, Amortized Cost	1,437,758	1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value	25,991
Held to Maturity, Due after one year through five years, Estimated Fair Value	353,852
Held to Maturity, Due after five years through ten years, Estimated Fair Value	439,542
Held to Maturity, Due after ten years, Estimated Fair Value	677,445
Held to Maturity, Estimated Fair Value	1,496,830	1,525,657
Available-for-sale Securities, Due in one year or less, Amortized Cost	241,102
Available for Sale, Due after one year through five years, Amortized Cost	411,156
Available for Sale, Due after five years through ten years, Amortized Cost	658,064
Available for Sale, Due after ten years, Amortized Cost	5,415,082
Available for Sale, Amortized Cost	6,725,404	6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value	243,001
Available for Sale, Due after one year through five years, Estimated Fair Value	444,100
Available for Sale, Due after five years through ten years, Estimated Fair Value	714,089
Available for Sale, Due after ten years, Estimated Fair Value	5,868,305
Securities available for sale, estimated fair value	7,269,495	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	42,279	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	$ 42,279	$ 42,867

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