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Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income $ 66,274 $ 37,059 $ 127,980 $ 75,868
AFS securities with OTTI charges during the period 0 (16) 0 (60)
Related income tax effect 0 6 0 22
Less: OTTI charges recognized in net income 0 16 0 60
Related income tax benefit 0 (6) 0 (22)
Reclassification of previous noncredit OTTI to credit OTTI 0 0 0 0
Related income tax benefit 0 0 0 0
Net unrealized (losses) gains on AFS securities with OTTI 0 0 0 0
Change in net unrealized gain on AFS securities arising during the period (10,684) 5,686 (32,701) 11,262
Related income tax effect 4,162 (2,104) 9,292 (4,167)
Net reclassification adjustment for (gains) losses included in net income 27 (763) 176 (977)
Related income tax expense (benefit) (6) 282 (41) 361
Total AFS securities - all other (6,501) 3,101 (23,274) 6,479
Net effect of AFS securities on other comprehensive income (6,501) 3,101 (23,274) 6,479
Accretion on the unrealized loss for securities transferred from AFS to the HTM investment portfolio prior to call or maturity 2 2 4 4
Related income tax expense (1) (1) (2) (2)
Net effect of HTM securities on other comprehensive income 1 1 2 2
Pension plan:        
Recognized net actuarial loss 1,162 1,100 2,311 2,187
Related income tax benefit (110) (405) (526) (797)
Net effect of change in pension plan asset on other comprehensive income 1,052 695 1,785 1,390
Net current-period other comprehensive income, net of tax (5,448) 3,797 (21,487) 7,871
Comprehensive income, net of tax $ 60,826 $ 40,856 $ 106,493 $ 83,739