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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income $ 32,725 $ 32,883 $ 30,586 $ 29,620 $ 19,497 $ 21,710 $ 23,182 $ 22,050 $ 125,814 $ 86,439 $ 70,674
Adjustments to reconcile to net cash provided by operating activities:                      
Amortization of stock-based compensation arrangements of subsidiaries                 1,352 1,180 1,636
Other, net                 (10,063) (1,173) (5,500)
INVESTING ACTIVITIES                      
Other, net                 (3,890) 4,038 9,519
FINANCING ACTIVITIES                      
Common stock acquired                 (7,914)   (5,523)
Cash dividends paid                 (30,265) (24,783) (22,770)
Redemption of Junior Subordinated debentures                 (5,155)    
Net (decrease)/increase in cash, due from banks and interest-bearing deposits                 (333,620) (92,586) 252,284
Cash, due from banks and interest-bearing deposits at the beginning of the period       1,757,875       1,850,461 1,757,875 1,850,461 1,598,177
Cash, due from banks and interest-bearing deposits at the end of the period 1,424,255       1,757,875       1,424,255 1,757,875 1,850,461
SUPPLEMENTAL DISCLOSURE                      
Cash paid during the period for interest                 41,549 20,563 14,673
Cash received during the period for income taxes, net                 27,952 41,058 32,700
Parent Company [Member]                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income                 125,814 86,439 70,674
Adjustments to reconcile to net cash provided by operating activities:                      
Equity in undistributed earnings of subsidiaries                 (87,404) (57,429) (44,172)
Amortization of stock-based compensation arrangements of subsidiaries                 1,306 1,142 401
Other, net                 (2,621) 569 136
Net cash provided by operating activities                 37,095 30,721 27,039
INVESTING ACTIVITIES                      
Net cash provided by acquisitions                 41,347    
Payments for investments in subsidiaries                   (502)  
Other, net                 (174) 100  
Net cash provided by (used in) investing activities                 41,173 (402)  
FINANCING ACTIVITIES                      
Issuance of common stock                 2,238 4,844 13,354
Common stock acquired                 (7,914)   (5,523)
Cash dividends paid                 (30,265) (24,783) (22,770)
Redemption of Junior Subordinated debentures                 (5,155)    
Net cash used for financing activities                 (41,096) (19,939) (14,939)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits                 37,172 10,380 12,100
Cash, due from banks and interest-bearing deposits at the beginning of the period       $ 67,917       $ 57,537 67,917 57,537 45,437
Cash, due from banks and interest-bearing deposits at the end of the period $ 105,089       $ 67,917       105,089 67,917 57,537
SUPPLEMENTAL DISCLOSURE                      
Cash paid during the period for interest                 2,171 2,122 2,096
Cash received during the period for income taxes, net                 $ 3,647 $ 4,643 $ 5,031