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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest income:      
Loans, including fees $ 990,519 $ 851,199 $ 534,790
Investment securities:      
Taxable 76,850 47,420 39,949
Tax-exempt 10,715 7,212 6,186
Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits with banks 6,763 4,198 9,902
Total interest income 1,084,847 910,029 590,827
Interest expense:      
Deposits 33,182 55,442 65,920
Federal funds purchased and securities sold under agreements to repurchase 1,189 1,950 2,627
Corporate and subordinated debentures 17,214 12,968 5,641
Other borrowings 44 13,204 12,364
Total interest expense 51,629 83,564 86,552
Net interest income 1,033,218 826,465 504,275
(Recovery) provision for credit losses (165,273) 235,989 12,777
Net interest income after (recovery) provision for credit losses 1,198,491 590,476 491,498
Noninterest income:      
Securities gains, net 102 50 2,711
Recoveries on acquired loans     6,847
Other income 36,881 26,389 8,872
Total noninterest income 354,209 311,140 143,565
Noninterest expense:      
Salaries and employee benefits 552,030 416,599 234,747
Occupancy expense 92,225 75,587 47,457
Information services expense 74,417 59,843 35,477
OREO expense and loan related expense 2,029 3,568 3,242
Pension plan termination expense     9,526
Amortization of intangibles 35,192 26,992 13,084
Supplies, printing and postage expense 9,659 8,679 5,881
Professional fees 10,629 14,033 10,325
FDIC assessment and other regulatory charges 17,982 10,713 4,545
Advertising and marketing 7,959 4,092 4,309
Extinguishment of debt cost 11,706    
Merger and branch consolidation related expense 67,242 85,906 4,552
Swap termination expense   38,787  
Other expense 67,351 52,845 31,493
Total noninterest expense 948,421 797,644 404,638
Earnings:      
Income before provision for (benefit of) income taxes 604,279 103,972 230,425
Provision for (benefit of) income taxes 128,736 (16,660) 43,942
Net income $ 475,543 $ 120,632 $ 186,483
Earnings per common share:      
Basic (in dollars per share) $ 6.76 $ 2.20 $ 5.40
Diluted (in dollars per share) $ 6.71 $ 2.19 $ 5.36
Weighted average common shares outstanding:      
Basic (in shares) 70,393 54,756 34,561
Diluted (in shares) 70,889 55,063 34,797
Fees on deposit accounts      
Noninterest income:      
Noninterest income $ 105,641 $ 84,319 $ 75,435
Mortgage banking income      
Noninterest income:      
Noninterest income 64,599 106,202 17,564
Trust and investment services income      
Noninterest income:      
Noninterest income 36,981 29,437 29,244
Correspondent banking and capital market income      
Noninterest income:      
Noninterest income $ 110,005 $ 64,743 $ 2,892