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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Available for Sale (Detail) $ in Thousands | Sep. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 792 | 44
Less than 12 months, Fair Value | $ 4,575,288 | $ 235,222
Less than 12 months, Unrealized Losses | $ (76,108) | $ (1,452)
12 months or more, Count | Security | 21 | 6
12 months or more, Fair Value | $ 61,595 | $ 2,833
12 months or more, Unrealized Losses | $ (2,948) | $ (259)
Total Count | Security | 813 | 50
Total Fair Value | $ 4,636,883 | $ 238,055
Total Unrealized Losses | $ (79,056) | $ (1,711)
U.S. Treasury [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 4 |
Less than 12 months, Fair Value | $ 59,419 |
Less than 12 months, Unrealized Losses | $ (171) |
Total Count | Security | 4 |
Total Fair Value | $ 59,419 |
Total Unrealized Losses | $ (171) |
Mortgage-backed [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 249 | 16
Less than 12 months, Fair Value | $ 3,939,967 | $ 174,234
Less than 12 months, Unrealized Losses | $ (64,932) | $ (1,157)
12 months or more, Count | Security | 2 |
12 months or more, Fair Value | $ 27,627 |
12 months or more, Unrealized Losses | $ (1,232) |
Total Count | Security | 251 | 16
Total Fair Value | $ 3,967,594 | $ 174,234
Total Unrealized Losses | $ (66,164) | $ (1,157)
State and political subdivisions [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 513 | 24
Less than 12 months, Fair Value | $ 539,497 | $ 55,653
Less than 12 months, Unrealized Losses | $ (10,792) | $ (279)
12 months or more, Count | Security | 19 | 6
12 months or more, Fair Value | $ 33,968 | $ 2,833
12 months or more, Unrealized Losses | $ (1,716) | $ (259)
Total Count | Security | 532 | 30
Total Fair Value | $ 573,465 | $ 58,486
Total Unrealized Losses | $ (12,508) | $ (538)
Corporates [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 26 | 4
Less than 12 months, Fair Value | $ 36,405 | $ 5,335
Less than 12 months, Unrealized Losses | $ (213) | $ (16)
Total Count | Security | 26 | 4
Total Fair Value | $ 36,405 | $ 5,335
Total Unrealized Losses | $ (213) | $ (16)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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