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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) | $ 68,611 | $ (5,206) | $ 146,950 | $ 4,113
Net unrealized loss on available for sale securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | (97,408) | 7,392 | (208,710) | (4,945)
OCI, after reclassifications, before tax | (97,408) | 7,392 | (208,710) | (4,945)
Tax effect | 28,797 | (2,186) | 61,702 | 1,461
Reclassifications, before tax | 0 | 0 | 0 | 0
Other comprehensive income (loss) | (68,611) | 5,206 | (147,008) | (3,484)
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 5 | (49) | 92 | (98)
OCI, after reclassifications, before tax | 0 | 0 | (82) | 0
Tax effect |  | 0 | (24) | 0
Reclassifications, before tax | (5) | 49 | (10) | 98
Other comprehensive income (loss) | 0 | 0 | (58) | 0
Amortization of prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | (7) | (15) | (14) | (29)
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassifications, before tax | 2 | 64 | 4 | 127
Joint beneficiary agreement liability |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
OCI, before reclassifications, before tax | 0 | 0 | 0 | (629)
Tax effect | 0 | 0 | 0 | 0
OCI, before reclassifications, net of tax | $ 0 | $ 0 | $ 0 | $ (629)

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