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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Effective Tax Rate Reconciliation [Line Items]                      
Income tax at the federal statutory rate                 $ 13,281 $ 12,572 $ 13,235
State income taxes, net of federal benefit                 598 639 1,006
Total effective income tax rate reconciliation, amount                 13,878 13,212 14,241
Tax-exempt interest income                 (1,336) (1,463) (1,645)
Nondeductible goodwill                 340    
Bank owned life insurance                 (335) (690) (555)
Other items, net                 271 322 283
Total income tax expense $ 3,638 $ 3,230 $ 3,022 $ 2,929 $ 2,993 $ 3,084 $ 2,467 $ 2,837 $ 12,819 $ 11,381 $ 12,324
Income tax at the federal statutory rate                 35.00% 35.00% 35.00%
State income taxes, net of federal benefit                 1.58% 1.78% 2.66%
Total effective income tax rate reconciliation, percent                 36.58% 36.78% 37.66%
Tax-exempt interest income                 (3.52%) (4.07%) (4.35%)
Nondeductible goodwill                 0.89%    
Bank owned life insurance                 (0.88%) (1.92%) (1.47%)
Other items, net                 0.71% 0.89% 0.75%
Income tax at the effective tax rate                 33.78% 31.68% 32.59%