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Condensed Parent Company Financial Statements - Schedule of Condensed Cash Flow Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
OPERATING ACTIVITIES      
Net income $ 192,113 $ 242,260 $ 122,044
Adjustments to reconcile net income to net cash provided by operating activities:      
Net change in other assets (63,074) 60,503 (30,280)
Net securities losses (gains) 1,777 (1,113) (4,268)
Other—net (3,075) (6,549) 2,702
Net cash provided by operating activities 204,140 336,297 59,606
INVESTING ACTIVITIES      
Proceeds from sales-securities available-for-sale     226,099
Net cash (used in) provided by investing activities (1,068,160) (328,496) 57,792
FINANCING ACTIVITIES      
Repayment of subordinated debt and junior subordinated debt   (60,000) (6,702)
Issuance of subordinated debt 147,702    
Issuance of common stock     59
Issuance of preferred stock     144,484
Treasury shares purchased—net (116,047) (179,882) (24,540)
Dividends paid to common and preferred shareholders (81,325) (86,484) (85,253)
Net cash provided by financing activities 21,073 338,110 553,253
Net (decrease) increase in cash, cash equivalents and restricted cash (842,947) 345,911 670,651
Cash, cash equivalents and restricted cash at beginning of the year 1,251,358 905,447 234,796
Cash, cash equivalents and restricted cash at end of the year 408,411 1,251,358 905,447
Parent Company [Member]      
OPERATING ACTIVITIES      
Net income 192,113 242,260 122,044
Adjustments to reconcile net income to net cash provided by operating activities:      
(Equity in undistributed net income) excess dividends of subsidiaries (30,918) 2,832 (66,289)
Net change in other assets 582 (1,453) 121
Net securities losses (gains)     22
Other—net 6,941 7,984 5,865
Net cash provided by operating activities 168,718 251,623 61,763
INVESTING ACTIVITIES      
Proceeds from sales-securities available-for-sale     203
Acquisitions and additional capitalization of subsidiaries, net of cash acquired (100)   (35,000)
Net cash (used in) provided by investing activities (100)   (34,797)
FINANCING ACTIVITIES      
Repayment of subordinated debt and junior subordinated debt   (35,000) (6,702)
Issuance of subordinated debt 147,702    
Issuance of common stock     59
Issuance of preferred stock     144,484
Treasury shares purchased—net (116,047) (179,882) (24,540)
Dividends paid to common and preferred shareholders (91,450) (96,609) (87,897)
Net cash provided by financing activities (59,795) (311,491) 25,404
Net (decrease) increase in cash, cash equivalents and restricted cash 108,823 (59,868) 52,370
Cash, cash equivalents and restricted cash at beginning of the year 163,356 223,224 170,854
Cash, cash equivalents and restricted cash at end of the year $ 272,179 $ 163,356 $ 223,224