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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | $ 817,761 | $ 1,393,099
Less than 12 months, unrealized loss | (133,462) | (14,640)
12 months or more, fair value | 1,624,715 | 153,834
12 months or more, unrealized loss | (184,700) | (2,165)
Total, fair value | 2,442,476 | 1,546,933
Total, unrealized loss | (318,162) | (16,805)
Available-for-sale Securities, Debt Maturities [Abstract] |  |
Less than 12 months, fair value | 0 |
Less than 12 months, unrealized loss | 0 |
12 months or more, fair value | 152,161 |
12 months or more, unrealized loss | (14,577) |
Total, fair value | 152,161 |
Total, unrealized loss | (14,577) |
Obligations of U.S. government agencies |  |
Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | 537,215 | 947,108
Less than 12 months, unrealized loss | (95,003) | (9,737)
12 months or more, fair value | 852,554 | 44,086
12 months or more, unrealized loss | (119,016) | (1,293)
Total, fair value | 1,389,769 | 991,194
Total, unrealized loss | (214,019) | (11,030)
Available-for-sale Securities, Debt Maturities [Abstract] |  |
Less than 12 months, fair value | 0 |
Less than 12 months, unrealized loss | 0 |
12 months or more, fair value | 146,904 |
12 months or more, unrealized loss | (14,435) |
Total, fair value | 146,904 |
Total, unrealized loss | (14,435) |
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | 27,993 | 56,154
Less than 12 months, unrealized loss | (8,728) | (785)
12 months or more, fair value | 253,108 | 0
12 months or more, unrealized loss | (40,966) | 0
Total, fair value | 281,101 | 56,154
Total, unrealized loss | (49,694) | (785)
Available-for-sale Securities, Debt Maturities [Abstract] |  |
Less than 12 months, fair value | 0 |
Less than 12 months, unrealized loss | 0 |
12 months or more, fair value | 5,257 |
12 months or more, unrealized loss | (142) |
Total, fair value | 5,257 |
Total, unrealized loss | (142) |
Corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | 0 |
Less than 12 months, unrealized loss | 0 |
12 months or more, fair value | 5,858 |
12 months or more, unrealized loss | (303) |
Total, fair value | 5,858 |
Total, unrealized loss | (303) |
Asset backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | 130,298 | 62,792
Less than 12 months, unrealized loss | (6,102) | (259)
12 months or more, fair value | 303,548 | 109,748
12 months or more, unrealized loss | (7,232) | (872)
Total, fair value | 433,846 | 172,540
Total, unrealized loss | (13,334) | (1,131)
Non-agency collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Abstract] |  |
Less than 12 months, fair value | 122,255 | 327,045
Less than 12 months, unrealized loss | (23,629) | (3,859)
12 months or more, fair value | 209,647 | 0
12 months or more, unrealized loss | (17,183) | 0
Total, fair value | 331,902 | 327,045
Total, unrealized loss | $ (40,812) | $ (3,859)

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