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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Adjustments to reconcile net earnings to cash used in operating activities:      
Stock-based compensation $ 5,548 $ 3,508 $ 2,953
Total adjustments 355 12,950 33,998
Net cash used in operating activities 208,182 164,953 138,409
Cash Flows from Investing Activities      
Net cash provided by investing activities 325,323 811,081 140,035
Cash Flows from Financing Activities      
Cash dividends on common stock (95,352) (65,966) (57,047)
Proceeds from exercise of stock options 2,215 1,701 2,683
Repurchase of common stock (2,640) (7,760) (1,128)
Net cash used in financing activities (511,935) (956,463) (255,700)
Cash and cash equivalents, beginning of period 163,948 144,377 121,633
Cash and cash equivalents, end of period 185,518 163,948 144,377
Parent Company [Member]      
Cash Flows from Operating Activities      
Net earnings 207,827 152,003 104,411
Adjustments to reconcile net earnings to cash used in operating activities:      
Earnings of subsidiaries (213,185) (156,401) (107,253)
Tax settlement received from the Bank 1,008 0 1,577
Stock-based compensation 5,548 3,508 2,953
Other operating activities, net (2,417) (2,052) (1,725)
Total adjustments (209,046) (154,945) (104,448)
Net cash used in operating activities (1,219) (2,942) (37)
Cash Flows from Investing Activities      
Dividends received from the Bank 106,000 77,800 57,000
Net cash provided by investing activities 106,000 77,800 57,000
Cash Flows from Financing Activities      
Cash dividends on common stock (95,352) (65,966) (57,047)
Proceeds from exercise of stock options 2,215 1,701 2,683
Repurchase of common stock (2,640) (7,760) (1,128)
Net cash used in financing activities (95,777) (72,025) (55,492)
Net increase in cash and cash equivalents 9,004 2,833 1,471
Cash and cash equivalents, beginning of period 22,050 19,217 17,746
Cash and cash equivalents, end of period $ 31,054 $ 22,050 $ 19,217