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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (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
OPERATING INCOME                      
Interest on interest-bearing deposits                 $ 7,908 $ 4,265 $ 4,391
OPERATING EXPENSE                      
Other                 32,857 33,972 36,407
Allocated income tax benefit/(expense)                 (37,263) (35,040) (27,284)
Amortization of stock-based compensation arrangements of subsidiaries                 (1,636) (1,717) (1,676)
Net income $ 18,620 $ 17,982 $ 17,493 $ 16,579 $ 15,728 $ 15,630 $ 18,553 $ 16,259 70,674 66,170 63,887
Parent Company [Member]                      
OPERATING INCOME                      
Dividends from subsidiaries                 28,175 26,043 24,851
Interest on interest-bearing deposits                 160 66 62
Other                 3 2 14
Total operating income                 28,338 26,111 24,927
OPERATING EXPENSE                      
Interest                 2,096 1,998 1,965
Other                 583 628 667
Total operating expense                 2,679 2,626 2,632
Income before taxes                 25,659 23,485 22,295
Allocated income tax benefit/(expense)                 1,244 (796) 472
Income before equity in undistributed earnings of subsidiaries                 26,903 22,689 22,767
Equity in undistributed earnings of subsidiaries                 44,172 44,653 42,196
Amortization of stock-based compensation arrangements of subsidiaries                 (401) (1,172) (1,076)
Net income                 $ 70,674 $ 66,170 $ 63,887