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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (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 earnings $ 17,851 $ 29,683 $ 28,373 $ 28,504 $ 27,076 $ 25,448 $ 25,514 $ 23,391 $ 104,411 $ 101,429 $ 99,145
Adjustments to reconcile net earnings to cash used in operating activities:                      
Stock-based compensation                 2,953 2,803 2,733
Total adjustments                 35,181 21,826 6,497
Cash Flows from Financing Activities                      
Cash dividends on common stock                 (57,047) (51,625) (48,862)
Proceeds from exercise of stock options                 2,683 5,151 5,144
Tax benefit related to exercise of stock options                 0 932 308
Repurchase of common stock                 (1,128) (1,907) (834)
Net increase in cash and cash equivalents                 22,744 15,536 329
Cash and cash equivalents, beginning of period       121,633       106,097 121,633 106,097 105,768
Cash and cash equivalents, end of period 144,377       121,633       144,377 121,633 106,097
Parent Company [Member]                      
Cash Flows from Operating Activities                      
Net earnings                 104,411 101,429 99,145
Adjustments to reconcile net earnings to cash used in operating activities:                      
Earnings of subsidiaries                 (107,253) (104,192) (102,259)
Tax settlement received from the Bank                 1,577 2,557 1,233
Stock-based compensation                 2,953 2,803 2,733
Other operating activities, net                 (1,725) (3,362) (2,180)
Total adjustments                 (104,448) (102,194) (100,473)
Net cash used in operating activities                 (37) (765) (1,328)
Cash Flows from Investing Activities                      
Dividends received from the Bank                 57,000 49,000 49,000
Net cash provided by investing activities                 57,000 49,000 49,000
Cash Flows from Financing Activities                      
Cash dividends on common stock                 (57,047) (51,625) (48,862)
Proceeds from exercise of stock options                 2,683 5,151 5,144
Tax benefit related to exercise of stock options                 0 932 308
Repurchase of common stock                 (1,128) (1,907) (834)
Net cash used in financing activities                 (55,492) (47,449) (44,244)
Net increase in cash and cash equivalents                 1,471 786 3,428
Cash and cash equivalents, beginning of period       $ 17,746       $ 16,960 17,746 16,960 13,532
Cash and cash equivalents, end of period $ 19,217       $ 17,746       $ 19,217 $ 17,746 $ 16,960