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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) $ 5,206 $ 25,751 $ (4,113) $ 5,841
Net unrealized gain on available for sale securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
OCI, before reclassifications, before tax 7,392 34,959 (4,945) 5,398
Reclassifications, before tax 0 0 0 0
OCI, after reclassifications, before tax 7,392 34,959 (4,945) 5,398
Tax effect (2,186) (10,334) 1,461 (1,595)
Other comprehensive income (loss) 5,206 24,625 (3,484) 3,803
Unfunded status of the supplemental retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
OCI, before reclassifications, before tax (49) 661 (98) 1,109
Reclassifications, before tax 49 465 98 929
OCI, after reclassifications, before tax 0 1,126 0 2,038
Tax effect 0 0 0 0
Other comprehensive income (loss) 0 1,126 0 2,038
Amortization of prior service cost        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassifications, before tax (15) (13) (29) (27)
Amortization of actuarial losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassifications, before tax 64 478 127 956
Joint beneficiary agreement liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
OCI, before reclassifications, before tax 0 0 (629) 0
Tax effect 0 0 0 0
OCI, before reclassifications, net of tax $ 0 $ 0 $ (629) $ 0