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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)