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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | $ 2,121,856 | $ 1,393,099
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (174,945) | (14,640)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 349,755 | 153,834
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (34,929) | (2,165)
Debt Securities, Available for Sale, Fair Value | 2,471,611 | 1,546,933
Debt Securities, Available-for-sale, Unrealized Loss | (209,874) | (16,805)
Debt Securities Held to Maturity, Less than 12 months, Fair Value | 164,703 |
Debt Securities, Held-to-maturity, Less than 12 Months, Unrealized | (5,705) |
Debt Securities Held to Maturity, 12 months or more, Fair Value | 0 |
Debt Securities, Held-to-maturity, 12 Months or Longer, Unrealized loss | 0 |
Debt Securities, Held-to-maturity, Fair value | 164,703 |
Debt Securities, Held-to-maturity, Unrealized loss | (5,705) |
Obligations of U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | 1,268,144 | 947,108
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (108,243) | (9,737)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 206,484 | 44,086
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (27,086) | (1,293)
Debt Securities, Available for Sale, Fair Value | 1,474,628 | 991,194
Debt Securities, Available-for-sale, Unrealized Loss | (135,329) | (11,030)
Debt Securities Held to Maturity, Less than 12 months, Fair Value | 164,158 |
Debt Securities, Held-to-maturity, Less than 12 Months, Unrealized | (5,679) |
Debt Securities Held to Maturity, 12 months or more, Fair Value | 0 |
Debt Securities, Held-to-maturity, 12 Months or Longer, Unrealized loss | 0 |
Debt Securities, Held-to-maturity, Fair value | 164,158 |
Debt Securities, Held-to-maturity, Unrealized loss | (5,679) |
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | 262,159 | 56,154
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (28,483) | (785)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 8,564 | 0
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (1,837) | 0
Debt Securities, Available for Sale, Fair Value | 270,723 | 56,154
Debt Securities, Available-for-sale, Unrealized Loss | (30,320) | (785)
Debt Securities Held to Maturity, Less than 12 months, Fair Value | 545 |
Debt Securities, Held-to-maturity, Less than 12 Months, Unrealized | (26) |
Debt Securities Held to Maturity, 12 months or more, Fair Value | 0 |
Debt Securities, Held-to-maturity, 12 Months or Longer, Unrealized loss | 0 |
Debt Securities, Held-to-maturity, Fair value | 545 |
Debt Securities, Held-to-maturity, Unrealized loss | (26) |
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | 6,044 |
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (115) |
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 0 |
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | 0 |
Debt Securities, Available for Sale, Fair Value | 6,044 |
Debt Securities, Available-for-sale, Unrealized Loss | (115) |
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | 308,125 | 62,792
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (9,125) | (259)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 120,128 | 109,748
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (5,529) | (872)
Debt Securities, Available for Sale, Fair Value | 428,253 | 172,540
Debt Securities, Available-for-sale, Unrealized Loss | (14,654) | (1,131)
Non-agency collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | 277,384 | 327,045
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (28,979) | (3,859)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 14,579 | 0
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (477) | 0
Debt Securities, Available for Sale, Fair Value | 291,963 | 327,045
Debt Securities, Available-for-sale, Unrealized Loss | $ (29,456) | $ (3,859)

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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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