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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Comprehensive Income (Loss)        
Unrealized holding gains (losses) on available for sale securities before reclassifications $ 5,355 $ (8,193) $ 27,618 $ (29,134)
Amounts reclassified out of accumulated other comprehensive income:        
Realized (gain) loss on debt securities (107) (207) (107) (207)
Total amounts reclassified out of accumulated other comprehensive income (107) (207) (107) (570)
Unrealized holding gains (losses) on available for sale securities after reclassifications 5,248 (8,400) 27,511 (29,704)
Tax effect (1,551) 2,483 (8,133) 8,763
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 3,697 (5,917) 19,378 (20,941)
Change in unfunded status of the supplemental retirement plans before reclassifications (89) 0 (266) 668
Amounts reclassified out of accumulated other comprehensive income:        
Amortization of prior service cost (13) (13) (40) (40)
Amoritzation of actuarial losses 102 128 306 382
Total amounts reclassified out of accumulated other comprehensive income 89 115 266 (326)
Change in unfunded status of the supplemental retirement plans after reclassifications   115   342
Tax effect   (34)   (101)
Change in unfunded status of the supplemental retirement plans, net of tax 0 81 0 241
Other comprehensive income (loss) $ 3,697 $ (5,836) $ 19,378 (20,700)
ASU 2016-01        
Amounts reclassified out of accumulated other comprehensive income:        
Total amounts reclassified out of accumulated other comprehensive income       62
ASU 2018-02        
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)