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Reclassifications Out of Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on sales of securities   $ 45   $ 45
Provision for income taxes $ (552) (20) $ (696) (84)
Net income 8,157 6,241 14,253 11,549
Salaries and employee benefits (10,719) (10,040) (21,862) (19,816)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on sales of securities   45   45
Provision for income taxes   (18)   (18)
Net income   27   27
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accretion of Unrealized Losses Transferred [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on sales of securities (662) (1,170) (1,324) (2,682)
Provision for income taxes 402 408 691 935
Net income (260) (762) (633) (1,747)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Prior-Service Costs [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits (3) (3) (6) (5)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Actuarial Gains (Losses) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits (385) (401) (770) (802)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Amortization of Defined Benefit Pension Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before taxes (388) (404) (776) (807)
Provision for income taxes 155 161 311 322
Net income $ (233) $ (243) $ (465) $ (485)