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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized holding gains (losses) on available for sale securities before reclassifications $ (8,193) $ 674 $ (29,134) $ 6,372
Amounts reclassified out of accumulated other comprehensive income:        
Realized gains on debt securities (207) (961) (207) (961)
Total amounts reclassified out of accumulated other comprehensive income (207) (961) (570) (961)
Unrealized holding gains (losses) on available for sale securities after reclassifications (8,400) (287) (29,704) 5,411
Tax effect 2,483 121 8,763 (2,274)
Unrealized holding gains (losses) on available for sale securities, net of tax (5,917) (166) (20,941) 3,137
Change in unfunded status of the supplemental retirement plans before reclassifications     668  
Amounts reclassified out of accumulated other comprehensive income:        
Amortization of prior service cost (13) (1) (40) (5)
Amortization of actuarial losses 128 96 382 288
Total amounts reclassified out of accumulated other comprehensive income 115 95 (326) 283
Change in unfunded status of the supplemental retirement plans after reclassifications 115 95 342 283
Tax effect (34) (40) (101) (119)
Change in unfunded status of the supplemental retirement plans, net of tax 81 55 241 164
Total other comprehensive income (loss) $ (5,836) $ (111) (20,700) $ 3,301
ASU 2016-01 [Member]        
Amounts reclassified out of accumulated other comprehensive income:        
Total amounts reclassified out of accumulated other comprehensive income     62  
ASU 2018-02 [Member]        
Amounts reclassified out of accumulated other comprehensive income:        
Total amounts reclassified out of accumulated other comprehensive income     (425)  
Amounts reclassified out of accumulated other comprehensive income:        
Total amounts reclassified out of accumulated other comprehensive income     $ (668)