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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 1,144,923 $ 1,021,944
Balance 1,127,685 985,481
Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 0 256
Gains/(losses) recognized in OCI 0 (660)
Reclasses from OCI to net income 0 361
Net period OCI 0 (299)
Balance 0 (43)
Pension/Post-retirement Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 2,194 (403)
Gains/(losses) recognized in OCI 0 0
Reclasses from OCI to net income 0 0
Net period OCI 0 0
Balance 2,194 (403)
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 2,194 (147)
Gains/(losses) recognized in OCI 0 (660)
Reclasses from OCI to net income 0 361
Net period OCI 0 (299)
Balance $ 2,194 $ (446)