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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash Flows From Operating Activities      
Net income $ 428,287 $ 277,538 $ 226,409
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 36,436 27,276 28,911
Amortization of other intangible assets 25,857 11,336 14,091
Amortization of tax credit investments 10,961 6,770 18,788
Net premium amortization on investment securities 18,684 16,305 18,798
Accretion income related to acquired loans (72,007) (16,747) (23,331)
Share-based compensation expense 28,656 7,497 7,707
Provision for credit losses 144,799 (29,622) 42,879
Debt securities (gains) losses, net 88 (4,327) (10,767)
Gain on sale of health savings accounts business (90,673) 0 0
Net (gains) losses on sales of loans and other assets 13,114 (36,677) (23,787)
Increase in cash surrender value of company-owned life insurance (14,564) (10,589) (12,031)
Residential real estate loans originated for sale (570,111) (1,215,015) (1,432,488)
Proceeds from sales of residential real estate loans 620,958 1,274,812 1,455,067
(Increase) decrease in interest receivable (52,911) 1,198 (183)
(Increase) decrease in other assets (40,518) 2,641 (105,969)
Increase (decrease) in accrued expenses and other liabilities 327,369 17,984 15,726
Net cash flows provided by (used in) operating activities 814,425 330,380 219,820
Cash Flows From Investing Activities      
Cash received (paid) from merger, net 1,912,629 0 0
Sale of health savings accounts (290,857) 0 0
Purchases of investment securities available-for-sale (1,438,572) (3,321,653) (2,803,406)
Purchases of investment securities held-to-maturity (170,675) 0 0
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock (147,394) 0 (10,025)
Purchases of equity securities (6,348) (11,000) 0
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale 1,284,814 1,511,510 1,990,383
Proceeds from sales of investment securities available-for-sale 20,032 198,886 299,885
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity 83,962 0 0
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock 108,698 58 4,691
Proceeds from sales of equity securities 53,029 544 39,296
Loan originations and payments, net (3,071,765) 206,145 (1,644,119)
Proceeds from company-owned life insurance death benefits 10,361 3,375 4,888
Proceeds from sale of premises and equipment and other assets 4,480 29,244 7,826
Purchases of premises and equipment and other assets (37,901) (48,692) (30,871)
Net cash flows provided by (used in) investing activities (1,685,507) (1,431,583) (2,141,452)
Net increase (decrease) in:      
Deposits (435,717) 1,531,742 2,484,056
Federal funds purchased and interbank borrowings 581,213 (890) (349,248)
Securities sold under agreements to repurchase (94,665) (38,891) 103,384
Other borrowings 177,146 36,187 4,171
Payments for maturities of Federal Home Loan Bank advances (2,102,506) (146,505) (751,505)
Payments for modification of Federal Home Loan Bank advances 0 (2,156) (31,124)
Proceeds from Federal Home Loan Bank advances 2,900,000 50,000 950,000
Cash dividends paid (177,623) (92,829) (92,946)
Common stock repurchased (71,182) (3,731) (82,358)
Common stock issued 809 583 577
Net cash flows provided by (used in) financing activities 777,475 1,333,510 2,235,007
Net increase (decrease) in cash and cash equivalents (93,607) 232,307 313,375
Cash and cash equivalents at beginning of period 822,019 589,712 276,337
Cash and cash equivalents at end of period $ 728,412 $ 822,019 $ 589,712