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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES      
Net income $ 271,156 $ 254,904 $ 238,167
Items not requiring (providing) cash      
Stock-based compensation expense 15,868 13,197 12,921
Deferred income taxes 10,937 (122) 34,911
Changes in:      
Other assets (33,495) (7,480) 31,920
Net cash provided by operating activities 277,780 202,543 256,078
INVESTING ACTIVITIES      
Net collections (originations) of loans 2,333,893 1,327,248 23,806
Proceeds from maturities of available-for-sale securities 1,001,669 2,346,930 793,270
Purchases of available-for-sale securities (5,266,148) (4,140,963) (1,708,948)
Net cash provided by (used in) investing activities (2,537,736) 1,189,869 604,477
FINANCING ACTIVITIES      
Proceeds from issuance of other borrowings 0 0 25,500
Stock repurchases 132,459 113,327 10,128
Dividends paid on preferred stock (47) (52) (339)
Dividends paid on common stock (78,845) (74,593) (63,921)
Retirement of preferred stock (767) 0 (42,000)
Net cash provided by (used in) financing activities 438,457 1,083,117 (697,390)
INCREASE (DECREASE) IN CASH EQUIVALENTS (1,821,499) 2,475,529 163,165
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 3,472,152 996,623 833,458
CASH AND CASH EQUIVALENTS, END OF YEAR 1,650,653 3,472,152 996,623
Parent Company      
OPERATING ACTIVITIES      
Net income 271,156 254,904 238,167
Items not requiring (providing) cash      
Stock-based compensation expense 15,868 13,197 12,921
Depreciation and amortization 1,805 1,796 1,637
Deferred income taxes 3,347 1,583 (3,632)
Equity in undistributed net income of bank subsidiaries (76,299) 29,345 (191,530)
Changes in:      
Other assets (2,099) (27,056) 3,299
Other liabilities 11,109 7,790 (2,648)
Net cash provided by operating activities 224,887 281,559 58,214
INVESTING ACTIVITIES      
Net collections (originations) of loans (2,139) 186 117
Net (purchases of) proceeds from premises and equipment (83) (7) (23,184)
(Advances to) repayment for subsidiaries 0 (15,363) 0
Proceeds from maturities of available-for-sale securities 0 0 2,544
Purchases of available-for-sale securities 0 0 (439)
Cash paid in business combinations (6,818) 0 (36,811)
Other, net 2 185 29
Net cash provided by (used in) investing activities (9,038) (14,999) (57,744)
FINANCING ACTIVITIES      
(Repayment) issuance of long-term debt, net (1,563) (7,442) 2,000
(Cancellation) issuance of common stock, net 1,460 (3,131) (1,077)
Stock repurchases 132,459 113,327 10,128
Dividends paid on preferred stock (47) (52) (339)
Dividends paid on common stock (78,845) (74,593) (63,921)
Retirement of preferred stock (767) 0 (42,000)
Net cash provided by (used in) financing activities (212,221) (198,545) (115,465)
INCREASE (DECREASE) IN CASH EQUIVALENTS 3,628 68,015 (114,995)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 172,083 104,068 219,063
CASH AND CASH EQUIVALENTS, END OF YEAR $ 175,711 $ 172,083 $ 104,068