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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Adjustments to reconcile net earnings to cash used in operating activities:      
Stock-based compensation $ 5,183 $ 5,529 $ 5,548
Total adjustments (17,279) 7,937 355
Net cash provided by operating activities 195,242 185,096 208,182
Cash Flows from Investing Activities      
Net cash used in investing activities (1,730,491) (1,268,758) 325,323
Cash Flows from Financing Activities      
Cash dividends on common stock (97,733) (98,475) (95,352)
Proceeds from exercise of stock options 1,277 231 2,215
Repurchase of common stock (8,337) (92,772) (2,640)
Net cash provided by financing activities 1,309,637 2,856,304 (511,935)
Cash and cash equivalents, beginning of period 1,958,160 185,518 163,948
Cash and cash equivalents, end of period 1,732,548 1,958,160 185,518
Parent Company [Member]      
Cash Flows from Operating Activities      
Net earnings 212,521 177,159 207,827
Adjustments to reconcile net earnings to cash used in operating activities:      
Earnings of subsidiaries (217,099) (182,064) (213,185)
Tax settlement received from the Bank 7,659 0 1,008
Stock-based compensation 5,183 5,529 5,548
Other operating activities, net (888) (2,018) (2,417)
Total adjustments (205,145) (178,553) (209,046)
Net cash provided by operating activities (7,376) (1,394) (1,219)
Cash Flows from Investing Activities      
Dividends received from the Bank 129,000 217,000 106,000
Net cash used in investing activities 129,000 217,000 106,000
Cash Flows from Financing Activities      
Repayment of junior subordinated debentures 25,774
Cash dividends on common stock (97,733) (98,475) (95,352)
Proceeds from exercise of stock options 1,277 231 2,215
Repurchase of common stock (8,337) (92,772) (2,640)
Net cash provided by financing activities (130,567) (191,016) (95,777)
Net increase in cash and cash equivalents 5,809 24,590 9,004
Cash and cash equivalents, beginning of period 55,644 31,054 22,050
Cash and cash equivalents, end of period $ 61,453 $ 55,644 $ 31,054