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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:          
Net income $ 145,596 $ 100,328 $ 511,109 $ 395,043 $ 422,417
Adjustments to reconcile net income to net cash provided by operating activities:          
Provision for credit losses 3,569 20,601 62,228 7,105 18,256
Depreciation 5,357 6,407 23,871 27,096 32,323
Amortization of discounts and premiums, net 1,344 6,384 11,123 7,951 (3,891)
Net loss (gain) on securities 483 (534) (1,265) (7,725) 14
Gain on trading activity (94) 0 (23) (66) (222)
Net (gain) loss on sales of loans (744) 4   75 (111)
Net gain on sales of fixed assets       (7,402)  
Stock-based compensation 8,612 8,251 29,401 32,048 36,260
Deferred tax expense 31,279 44,465 219,342 100,813 23,197
Changes in operating assets and liabilities:          
Decrease (increase) in other assets 7,891 [1] (34,397) [1] (411,074) [2] (55,825) [2] 29,952 [2]
Increase (decrease) in other liabilities (28,007) [3] (20,813) [3] 8,619 [4] 10,571 [4] (53,320) [4]
Purchases of securities held for trading (60,000) 0 (15,000) (42,500) (141,615)
Proceeds from sales of securities held for trading 60,094 0 15,023 42,566 141,837
Held for sale originations (51,766) 0 (119,158)    
Proceeds from sales of loans originated for sale         35,258
Net cash provided by operating activities 123,614 130,696 334,196 509,750 540,355
Cash Flows from Investing Activities:          
Proceeds from repayment of securities available for sale 495,342 428,098 2,061,756 1,962,433 817,822
Proceeds from sales of securities available for sale   369,972 483,872 361,311 278,539
Purchase of securities available for sale (985,594) (483,789) (2,513,853) (2,503,248) (3,288,204)
Redemption of Federal Home Loan Bank stock 15,601 72,567 172,544 135,906 120,220
Purchases of Federal Home Loan Bank stock (580) (88,875) (238,987) (138,878) (160,991)
Proceeds from (purchases of) bank-owned life insurance, net 7,182 1,772 12,296 (138,119) 16,303
Proceeds from sales of loans 32,929 3,124 3,128 115,205 195,760
Purchases of loans (20,723) (26,300) (95,618) (864,299)  
Other changes in loans, net (225,019) (380,427) (911,805) (998,515) (1,990,068)
Dispositions (purchases) of premises and equipment, net (317) (438) 1,308 9,297 (9,847)
Net cash used in investing activities (681,179) (104,296) (1,025,359) (2,058,907) (4,020,466)
Cash Flows from Financing Activities:          
Net increase in deposits 1,760,323 315,634 779,681 892,702 1,662,267
Net increase in short-term borrowed funds   1,350,000 1,150,000 1,100,000  
Proceeds from long-term borrowed funds 325,000 2,150,000 6,925,000 4,785,812 5,667,268
Repayments of long-term borrowed funds (650,000) (3,125,000) (6,550,000) (5,537,000) (4,373,500)
Cash dividends paid on common stock (79,052) (79,332) (315,607) (317,394) (333,061)
Cash dividends paid on preferred stock (8,207) (8,207) (32,828) (32,828) (32,828)
Treasury stock repurchased   (28,924) (50,190) (67,125) (160,767)
Payments relating to treasury shares received for restricted stock award tax payments (15,515) (8,235) (8,832) (8,095) (2,482)
Net cash provided by financing activities 1,332,549 565,936 1,897,224 816,072 2,426,897
Net increase (decrease) in cash, cash equivalents, and restricted cash 774,984 592,336 1,206,061 (733,085) (1,053,214)
Cash, cash equivalents, and restricted cash at beginning of year 1,947,931 741,870 741,870 1,474,955 2,528,169
Cash, cash equivalents, and restricted cash at end of year 2,722,915 1,334,206 1,947,931 741,870 1,474,955
Supplemental information:          
Cash paid for interest 113,189 202,459 632,660 813,161 645,588
Cash paid for income taxes 14,005 10,000 117,873 75,680 44,123
Non-cash investing and financing activities:          
Transfers to repossessed assets from loans   120 578 4,689 5,631
Operating lease liabilities arising from obtaining right-of-use assets as of January 1, 2019       324,360  
Securitization of residential mortgage loans to mortgage-backed securities available for sale 20,723 26,300 53,199 93,531  
Transfer of loans from held for investment to held for sale 47,745 3,124   115,280 195,649
Disposition of premises and equipment       1,245  
Shares issued for restricted stock awards $ 28,051 $ 22,198 $ 22,198 $ 16,501 $ 8,879
[1] Includes $4.7 million and $4.1 million of amortization of operating lease right-of-use assets for the three months ended March 31, 2021 and 2020, respectively.
[2] Includes $20.0 million and $38.4 million of net amortization of operating lease right-of-use assets for the twelve months ended December 31, 2020 and December 31, 2019, respectively.
[3] Includes $4.7 million and $4.1 million of amortization of operating lease liability for the three months ended March 31, 2021 and 2020, respectively.
[4] Includes $20.0 million and $38.4 million of net amortization of operating lease liability for the twelve months ended December 31, 2020 and December 31, 2019, respectively.