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Other Comprehensive Income (Loss) - Schedule of Components of OCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unrealized losses on available for sale debt securities: |  |  |
Net gains (losses) arising during the period | $ 20,134 | $ 24,987 | $ (8,425)
Reclassification adjustment for gains included in net income | 0 | 0 | 0
Total | 20,134 | 24,987 | (8,425)
Unrealized (losses) gains on derivatives (cash flow hedges) | (7,099) | (780) |
Unrealized (losses) gains on derivatives (cash flow hedges) |  |  | 304
Amortization related to post-retirement obligations | 5,604 | (2,176) | 1,678
Total other comprehensive income (loss) | 18,639 | 22,031 | (6,443)
Unrealized losses on available for sale debt securities: |  |  |
Net gains (losses) arising during the period | (5,190) | (6,636) | 2,296
Reclassification adjustment for gains included in net income | 0 | 0 | 0
Total | (5,190) | (6,636) | 2,296
Unrealized (losses) gains on derivatives (cash flow hedges) | 1,830 | 201 |
Unrealized (losses) gains on derivatives (cash flow hedges) |  |  | (83)
Amortization related to post-retirement obligations | (1,445) | 561 | (457)
Total other comprehensive income (loss) | (4,805) | (5,874) | 1,756
Unrealized losses on available for sale debt securities: |  |  |
Net gains (losses) arising during the period | 14,944 | 18,351 | (6,129)
Reclassification adjustment for gains included in net income | 0 | 0 | 0
Total | 14,944 | 18,351 | (6,129)
Unrealized (losses) gains on derivatives (cash flow hedges) | (5,269) | (579) |
Unrealized (losses) gains on derivatives (cash flow hedges) |  |  | 221
Amortization related to post-retirement obligations | 4,159 | (1,615) | 1,221
Total other comprehensive income (loss) | $ 13,834 | $ 16,157 | $ (4,687)

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