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Condensed Parent Company Financial Statements - Schedule of Condensed Cash Flow Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES      
Net income $ 242,260 $ 122,044 $ 158,873
Adjustments to reconcile net income to net cash provided by operating activities:      
Net change in other assets 60,503 (30,280) (33,400)
Net securities (gains) losses (1,113) (4,268) (4,320)
Other—net (6,549) 2,702 (243)
Net cash provided by operating activities 336,297 59,606 163,363
INVESTING ACTIVITIES      
Proceeds from sales-securities available-for-sale 0 226,099 125,839
Acquisitions and additional capitalization of subsidiaries, net of cash acquired     60,025
Net cash (used in) provided by investing activities (328,496) 57,792 103,786
FINANCING ACTIVITIES      
Repayment of subordinated and junior subordinated debt (60,000) (6,702) (33,506)
Issuance of common stock   59 72
Issuance of preferred stock   144,484  
Treasury shares purchased—net (179,882) (24,540) (10,211)
Dividends paid to common and preferred shareholders (86,484) (85,253) (66,571)
Net cash provided by (used in) financing activities 338,110 553,253 (201,539)
Net increase in cash, cash equivalents and restricted cash 345,911 670,651 65,610
Cash, cash equivalents and restricted cash at beginning of the year 905,447 234,796 169,186
Cash, cash equivalents and restricted cash at end of the year 1,251,358 905,447 234,796
Parent Company [Member]      
OPERATING ACTIVITIES      
Net income 242,260 122,044 158,873
Adjustments to reconcile net income to net cash provided by operating activities:      
Excess dividends (equity in undistributed net income) of subsidiaries 2,832 (66,289) (64,214)
Net change in other assets (1,453) 121 (5,443)
Net securities (gains) losses   22 (19)
Other—net 7,984 5,865 6,898
Net cash provided by operating activities 251,623 61,763 96,095
INVESTING ACTIVITIES      
Proceeds from sales-securities available-for-sale   203 1,007
Acquisitions and additional capitalization of subsidiaries, net of cash acquired   (35,000) 62,112
Net cash (used in) provided by investing activities   (34,797) 63,119
FINANCING ACTIVITIES      
Repayment of subordinated and junior subordinated debt (35,000) (6,702) (33,506)
Issuance of common stock   59 72
Issuance of preferred stock   144,484  
Treasury shares purchased—net (179,882) (24,540) (10,211)
Dividends paid to common and preferred shareholders (96,609) (87,897) (66,572)
Net cash provided by (used in) financing activities (311,491) 25,404 (110,217)
Net increase in cash, cash equivalents and restricted cash (59,868) 52,370 48,997
Cash, cash equivalents and restricted cash at beginning of the year 223,224 170,854 121,857
Cash, cash equivalents and restricted cash at end of the year $ 163,356 $ 223,224 $ 170,854