Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 155,963
Held to Maturity, Due after one year through five years, Amortized Cost	464,967
Held to Maturity, Due after five years through ten years, Amortized Cost	723,194
Held to Maturity, Due after ten years, Amortized Cost	601,709
Held to Maturity, Amortized Cost	1,945,833	$ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value	156,711
Held to Maturity, Due after one year through five years, Estimated Fair Value	482,197
Held to Maturity, Due after five years through ten years, Estimated Fair Value	769,547
Held to Maturity, Due after ten years, Estimated Fair Value	644,441
Held to Maturity, Estimated Fair Value	2,052,896	2,048,675
Available for Sale, Due in one year or less, Amortized Cost	1,010,272
Available for Sale, Due after one year through five years, Amortized Cost	1,634,771
Available for Sale, Due after five years through ten years, Amortized Cost	661,303
Available for Sale, Due after ten years, Amortized Cost	6,378,704
Available for Sale, Amortized Cost	9,727,401	10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value	1,025,222
Available for Sale, Due after one year through five years, Estimated Fair Value	1,777,450
Available for Sale, Due after five years through ten years, Estimated Fair Value	717,876
Available for Sale, Due after ten years, Estimated Fair Value	6,874,666
Available for Sale, Estimated Fair Value	10,437,565	11,269,591
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	22
Held to Maturity, Due after one year through five years, Amortized Cost	165
Held to Maturity, Due after five years through ten years, Amortized Cost	516,118
Held to Maturity, Due after ten years, Amortized Cost	12,479
Held to Maturity, Amortized Cost	528,784	530,861
Held to Maturity, Due in one year or less, Estimated Fair Value	22
Held to Maturity, Due after one year through five years, Estimated Fair Value	167
Held to Maturity, Due after five years through ten years, Estimated Fair Value	556,610
Held to Maturity, Due after ten years, Estimated Fair Value	13,727
Held to Maturity, Estimated Fair Value	570,526	521,518
Available for Sale, Due in one year or less, Amortized Cost	11,833
Available for Sale, Due after one year through five years, Amortized Cost	25,336
Available for Sale, Due after five years through ten years, Amortized Cost	22,583
Available for Sale, Due after ten years, Amortized Cost	1,856,829
Available for Sale, Amortized Cost	1,916,581	2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value	12,278
Available for Sale, Due after one year through five years, Estimated Fair Value	26,724
Available for Sale, Due after five years through ten years, Estimated Fair Value	23,116
Available for Sale, Due after ten years, Estimated Fair Value	1,925,561
Available for Sale, Estimated Fair Value	1,987,679	2,207,594
States and Political Subdivisions [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	155,941
Held to Maturity, Due after one year through five years, Amortized Cost	463,302
Held to Maturity, Due after five years through ten years, Amortized Cost	207,076
Held to Maturity, Due after ten years, Amortized Cost	589,230
Held to Maturity, Amortized Cost	1,415,549	1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value	156,689
Held to Maturity, Due after one year through five years, Estimated Fair Value	480,530
Held to Maturity, Due after five years through ten years, Estimated Fair Value	212,937
Held to Maturity, Due after ten years, Estimated Fair Value	630,714
Held to Maturity, Estimated Fair Value	1,480,870	1,525,657
Available for Sale, Due in one year or less, Amortized Cost	199,697
Available for Sale, Due after one year through five years, Amortized Cost	1,323,635
Available for Sale, Due after five years through ten years, Amortized Cost	638,720
Available for Sale, Due after ten years, Amortized Cost	4,521,875
Available for Sale, Amortized Cost	6,683,927	6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value	201,166
Available for Sale, Due after one year through five years, Estimated Fair Value	1,442,871
Available for Sale, Due after five years through ten years, Estimated Fair Value	694,760
Available for Sale, Due after ten years, Estimated Fair Value	4,949,105
Available for Sale, Estimated Fair Value	7,287,902	7,070,997
Other [Member]
Schedule of Available-for-Sale Securities [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, 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	42,351	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
Available for Sale, Estimated Fair Value	42,351	42,867
US Treasury [Member]
Schedule of Available-for-Sale Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	798,742
Available for Sale, Due after one year through five years, Amortized Cost	285,800
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	1,084,542	1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value	811,778
Available for Sale, Due after one year through five years, Estimated Fair Value	307,855
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
Available for Sale, Estimated Fair Value	$ 1,119,633	$ 1,948,133

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