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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands | Dec. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 887,036 | $ 1,825,891
Less than 12 months, Unrealized Losses | $ (54,828) | $ (31,548)
Less than 12 months, Number of Securities | Security | 498 | 187
12 months or more, Fair Value | $ 1,619,473 | $ 252,725
12 months or more, Unrealized Losses | $ (291,079) | $ (5,227)
12 months or more, Number of Securities | Security | 264 | 35
Fair Value, Total | $ 2,506,509 | $ 2,078,616
Unrealized Losses, Total | $ (345,907) | $ (36,775)
Number of Securities Total | Security | 762 | 222
U.S. Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 107,011 | $ 114,486
Less than 12 months, Unrealized Losses | $ (8,435) | $ (1,865)
Less than 12 months, Number of Securities | Security | 35 | 12
12 months or more, Fair Value | $ 118,779 | $ 32,688
12 months or more, Unrealized Losses | $ (25,015) | $ (1,175)
12 months or more, Number of Securities | Security | 13 | 4
Fair Value, Total | $ 225,790 | $ 147,174
Unrealized Losses, Total | $ (33,450) | $ (3,040)
Number of Securities Total | Security | 48 | 16
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 514,789 | $ 1,568,138
Less than 12 months, Unrealized Losses | $ (39,246) | $ (29,060)
Less than 12 months, Number of Securities | Security | 294 | 143
12 months or more, Fair Value | $ 1,328,906 | $ 141,681
12 months or more, Unrealized Losses | $ (258,741) | $ (3,386)
12 months or more, Number of Securities | Security | 202 | 23
Fair Value, Total | $ 1,843,695 | $ 1,709,819
Unrealized Losses, Total | $ (297,987) | $ (32,446)
Number of Securities Total | Security | 496 | 166
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 190,189 | $ 131,970
Less than 12 months, Unrealized Losses | $ (5,106) | $ (579)
Less than 12 months, Number of Securities | Security | 38 | 25
12 months or more, Fair Value | $ 159,543 | $ 78,356
12 months or more, Unrealized Losses | $ (4,974) | $ (666)
12 months or more, Number of Securities | Security | 36 | 8
Fair Value, Total | $ 349,732 | $ 210,326
Unrealized Losses, Total | $ (10,080) | $ (1,245)
Number of Securities Total | Security | 74 | 33
Obligations of State and Political Subdivisions [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 67,822 | $ 4,307
Less than 12 months, Unrealized Losses | $ (1,815) | $ (35)
Less than 12 months, Number of Securities | Security | 128 | 2
12 months or more, Fair Value | $ 7,812 |
12 months or more, Unrealized Losses | $ (2,282) |
12 months or more, Number of Securities | Security | 10 |
Fair Value, Total | $ 75,634 | $ 4,307
Unrealized Losses, Total | $ (4,097) | $ (35)
Number of Securities Total | Security | 138 | 2
Corporate Debt Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 7,225 | $ 6,990
Less than 12 months, Unrealized Losses | $ (226) | $ (9)
Less than 12 months, Number of Securities | Security | 3 | 5
12 months or more, Fair Value | $ 4,433 |
12 months or more, Unrealized Losses | $ (67) |
12 months or more, Number of Securities | Security | 3 |
Fair Value, Total | $ 11,658 | $ 6,990
Unrealized Losses, Total | $ (293) | $ (9)
Number of Securities Total | Security | 6 | 5

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