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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands | Mar. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
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Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 1,128,184 | $ 340,022
Less than 12 months, Unrealized Losses | $ (17,342) | $ (1,638)
Less than 12 months, Number of Securities | Security | 114 | 53
12 months or more, Fair Value | $ 3,531 | $ 4,136
12 months or more, Unrealized Losses | $ (82) | $ (121)
12 months or more, Number of Securities | Security | 4 | 3
Fair Value, Total | $ 1,131,715 | $ 344,158
Unrealized Losses, Total | $ (17,424) | $ (1,759)
Number of Securities Total | Security | 118 | 56
U.S. Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 56,270 | $ 18,308
Less than 12 months, Unrealized Losses | $ (2,706) | $ (142)
Less than 12 months, Number of Securities | Security | 6 | 2
Fair Value, Total | $ 56,270 | $ 18,308
Unrealized Losses, Total | $ (2,706) | $ (142)
Number of Securities Total | Security | 6 | 2
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 | $ 973,961 | $ 224,448
Less than 12 months, Unrealized Losses | $ (13,879) | $ (1,227)
Less than 12 months, Number of Securities | Security | 98 | 41
12 months or more, Fair Value | $ 3,531 | $ 4,136
12 months or more, Unrealized Losses | $ (82) | $ (121)
12 months or more, Number of Securities | Security | 4 | 3
Fair Value, Total | $ 977,492 | $ 228,584
Unrealized Losses, Total | $ (13,961) | $ (1,348)
Number of Securities Total | Security | 102 | 44
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 | $ 94,186 | $ 97,266
Less than 12 months, Unrealized Losses | $ (721) | $ (269)
Less than 12 months, Number of Securities | Security | 9 | 10
Fair Value, Total | $ 94,186 | $ 97,266
Unrealized Losses, Total | $ (721) | $ (269)
Number of Securities Total | Security | 9 | 10
Obligations of State and Political Subdivisions [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 3,767 |
Less than 12 months, Unrealized Losses | $ (36) |
Less than 12 months, Number of Securities | Security | 1 |
Fair Value, Total | $ 3,767 |
Unrealized Losses, Total | $ (36) |
Number of Securities Total | Security | 1 |

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- Definition Investment securities in unrealized loss positions qualitative disclosure number of positions. + References No definition available. + Details
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- Definition Net unrealized gains and losses on investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position. + References No definition available. + Details
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- Definition Continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition Continuous unrealized loss position twelve months or longer aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition Number of investment positions in that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in a continuous unrealized loss position for less than one year, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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