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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Unrealized holding gains on available for sale securities before reclassifications | $ 34,959 | $ 9,553 | $ 5,398 | $ 22,263
Tax effect | (10,334) | (2,824) | (1,595) | (6,582)
Unrealized holding gains on available for sale securities, net of tax | 24,625 | 6,729 | 3,803 | 15,681
Change in unfunded status of the supplemental retirement plans before reclassifications | 661 | (88) | 1,109 | (177)
Amounts reclassified out of accumulated other comprehensive income (loss): |  |  |  |
Amortization of prior service cost | (13) | (14) | (27) | (27)
Amortization of actuarial losses | 478 | 102 | 956 | 204
Total amounts reclassified out of accumulated other comprehensive income | 465 | 88 | 929 | 177
Change in unfunded status of the supplemental retirement plans after reclassifications | 1,126 | 0 | 2,038 | 0
Tax effect | 0 | 0 | 0 | 0
Change in unfunded status of the supplemental retirement plans, net of tax | 1,126 | 0 | 2,038 | 0
Other comprehensive income | $ 25,751 | $ 6,729 | $ 5,841 | $ 15,681

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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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