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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income $ 562,152 $ 560,742 $ 527,323
Operating activities:      
Net amortization/accretion of premium/discount on securities 58,792 65,838 59,066
Depreciation, amortization and accretion 78,698 62,298 53,256
Provision for credit losses 93,596 67,925 16,126
Gains on mortgage loans sold, net (6,511) (7,268) (32,424)
Investment losses (gains) on sales, net 19,674 (156) (759)
Gain on other equity investments, net (8,732) (10,605) (23,109)
Gain on remeasurement of previously held noncontrolling interest 0 (5,500) 0
Stock-based compensation expense 41,879 39,552 24,952
Deferred tax expense (benefit) 72,368 19,740 (12,232)
Losses (gains) on disposition of other real estate and other investments 13 (179) (1,168)
Gain on sale of fixed assets (86,048) (457) (15)
Income from equity method investment (85,402) (145,466) (122,274)
Dividends received from equity method investment 36,694 63,114 69,996
Excess tax benefit from stock compensation (208) (3,027) (2,475)
Gains on commercial loans sold, net (643) (2,275) (4,143)
(Increase) decrease in other assets (262,851) (82,436) 73,542
Increase (decrease) in other liabilities 7,944 (26,620) (60,315)
Net cash provided by operating activities 478,404 604,925 657,444
Investing activities:      
Payments to Acquire Debt Securities, Available-for-sale 1,114,808 699,293 2,107,794
Proceeds from Sale of Debt Securities, Available-for-sale 312,574 29,501 37,457
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale 139,251 417,348 617,054
Payments to Acquire Held-to-maturity Securities 0 968,449 186,260
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities 43,639 74,770 40,442
Net decrease (increase) in securities purchased under agreements to resell (44,733) 486,724 (1,000,000)
Increase in loans, net 3,812,426 5,634,350 1,027,185
Proceeds from Sale, Loan and Lease, Held-for-Investment 117,216 0 0
Purchases of premises and equipment and software 78,256 63,522 23,178
Purchase of bank owned life insurance 244,000 100,000 0
Proceeds from bank owned life insurance settlement 3,992 1,951 1,656
Proceeds from sales of software, premises, and equipment 198,920 698 281
Acquisitions, net of cash acquired 0 30,896 0
Proceeds from sale of other real estate 6,018 994 6,090
Proceeds from (payments for) derivative instruments 0 (95,734) 99,710
Payments to Acquire Federal Home Loan Bank Stock (36,829) (12,389)  
Proceeds from sale (purchase) of Federal Home Loan Bank stock     12,602
Purchase of other intangible assets 0 825 0
Increase in other investments 92,997 90,967 83,830
Net cash used in investing activities (4,602,439) (6,684,439) (3,612,955)
Financing activities:      
Net increase in deposits 3,578,604 3,661,396 3,599,084
Net increase in securities sold under agreements to repurchase 14,579 42,351 24,395
Federal Home Loan Bank: Advances 3,425,000 500,000 0
Federal Home Loan Bank: Repayments/maturities 1,750,001 925,000 200,001
Repayments of Notes Payable 0 (29,547) (250,000)
Principal payments of finance lease obligation 311 281 261
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes (3,725) (5,462) (3,790)
Proceeds From Stock Options Exercised, Net of Repurchase of Restricted Shares (3,215) 4,714 3,130
Common dividends paid 68,737 68,194 55,504
Preferred stock dividends paid 15,192 15,192 15,192
Net cash provided by financing activities 5,177,002 3,155,357 3,095,601
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 1,052,967 (2,924,157) 140,090
Cash, cash equivalents and restricted cash, beginning of year 1,177,382 4,101,539 3,961,449
Cash, cash equivalents and restricted cash, end of year 2,230,349 1,177,382 4,101,539
Commercial Loan [Member]      
Operating activities:      
Payments for Origination and Purchases of Loans Held-for-sale (368,588) (498,312) (564,647)
Proceeds from Sale of Loans Held-for-sale 381,045 497,180 582,305
Consumer Loan [Member]      
Operating activities:      
Payments for Origination and Purchases of Loans Held-for-sale (1,754,147) (1,578,168) (2,037,897)
Proceeds from Sale of Loans Held-for-sale $ 1,698,679 $ 1,589,005 $ 2,112,336