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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income $ 19,497 $ 21,710 $ 23,182 $ 22,050 $ 18,620 $ 17,982 $ 17,493 $ 16,579 $ 86,439 $ 70,674 $ 66,170
Adjustments to reconcile to net cash provided by operating activities:                      
Amortization of stock-based compensation arrangements                 1,180 1,636 1,717
Other, net                 (1,173) (5,500) 6,301
Net cash provided by operating activities                 104,525 90,541 78,159
INVESTING ACTIVITIES                      
Net cash and due from banks paid for acquisitions                     (4,007)
Net cash used in investing activities                 (344,560) (98,017) (265,298)
FINANCING ACTIVITIES                      
Issuance of common stock, net                 4,844 13,354 4,428
Common stock acquired                   (5,523) (1,654)
Cash dividends paid                 (24,783) (22,770) (21,449)
Net cash provided by (used in) financing activities                 147,449 259,760 (128,579)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits                 (92,586) 252,284 (315,718)
Cash, due from banks and interest-bearing deposits at the beginning of the period       1,850,461       1,598,177 1,850,461 1,598,177 1,913,895
Cash, due from banks and interest-bearing deposits at the end of the period 1,757,875       1,850,461       1,757,875 1,850,461 1,598,177
SUPPLEMENTAL DISCLOSURE                      
Cash paid during the period for interest                 20,563 14,673 12,255
Cash received during the period for income taxes, net                 41,058 32,700 33,531
Parent Company [Member]                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income                 86,439 70,674 66,170
Adjustments to reconcile to net cash provided by operating activities:                      
Equity in undistributed earnings of subsidiaries                 (57,429) (44,172) (44,653)
Amortization of stock-based compensation arrangements                 1,142 401 1,172
Other, net                 569 136 (343)
Net cash provided by operating activities                 30,721 27,039 22,346
INVESTING ACTIVITIES                      
Net cash and due from banks paid for acquisitions                     5,066
Payments for investments in subsidiaries                 (502)    
Sales and maturities of held for investment and available for sale securities                 100    
Net cash used in investing activities                 (402)   5,066
FINANCING ACTIVITIES                      
Issuance of common stock, net                 4,844 13,354 4,428
Common stock acquired                   (5,523) (1,654)
Cash dividends paid                 (24,783) (22,770) (21,449)
Net cash provided by (used in) financing activities                 (19,939) (14,939) (18,675)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits                 10,380 12,100 8,737
Cash, due from banks and interest-bearing deposits at the beginning of the period       $ 57,537       $ 45,437 57,537 45,437 36,700
Cash, due from banks and interest-bearing deposits at the end of the period $ 67,917       $ 57,537       67,917 57,537 45,437
SUPPLEMENTAL DISCLOSURE                      
Cash paid during the period for interest                 2,122 2,096 1,998
Cash received during the period for income taxes, net                 $ 4,643 $ 5,031 $ 1,131