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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Adjustments to reconcile net earnings to cash used in operating activities:      
Stock-based compensation $ 3,508 $ 2,953 $ 2,803
Total adjustments 16,375 33,998 23,103
Net cash used in operating activities 168,378 138,409 124,532
Cash Flows from Investing Activities      
Net cash provided by investing activities 807,656 140,035 (154,016)
Cash Flows from Financing Activities      
Cash dividends on common stock (65,966) (57,047) (51,625)
Proceeds from exercise of stock options 1,701 2,683 5,151
Tax benefit related to exercise of stock options 0 0 932
Repurchase of common stock (7,760) (1,128) (1,907)
Net cash (used in) provided by financing activities (956,463) (255,700) 45,020
Net increase in cash and cash equivalents 19,571 22,744 15,536
Cash and cash equivalents, beginning of period 144,377 121,633 106,097
Cash and cash equivalents, end of period 163,948 144,377 121,633
Parent Company [Member]      
Cash Flows from Operating Activities      
Net earnings 152,003 104,411 101,429
Adjustments to reconcile net earnings to cash used in operating activities:      
Earnings of subsidiaries (156,401) (107,253) (104,192)
Tax settlement received from the Bank 0 1,577 2,557
Stock-based compensation 3,508 2,953 2,803
Other operating activities, net (2,052) (1,725) (3,362)
Total adjustments (154,945) (104,448) (102,194)
Net cash used in operating activities (2,942) (37) (765)
Cash Flows from Investing Activities      
Dividends received from the Bank 77,800 57,000 49,000
Net cash provided by investing activities 77,800 57,000 49,000
Cash Flows from Financing Activities      
Cash dividends on common stock (65,966) (57,047) (51,625)
Proceeds from exercise of stock options 1,701 2,683 5,151
Tax benefit related to exercise of stock options 0 932
Repurchase of common stock (7,760) (1,128) (1,907)
Net cash (used in) provided by financing activities (72,025) (55,492) (47,449)
Net increase in cash and cash equivalents 2,833 1,471 786
Cash and cash equivalents, beginning of period 19,217 17,746 16,960
Cash and cash equivalents, end of period $ 22,050 $ 19,217 $ 17,746