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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest income:      
Loans, including fees $ 851,199 $ 534,790 $ 521,478
Investment securities:      
Taxable 47,420 39,949 35,563
Tax-exempt 7,212 6,186 6,152
Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits with banks 4,198 9,902 4,015
Total interest income 910,029 590,827 567,208
Interest expense:      
Deposits 55,442 65,920 45,452
Federal funds purchased and securities sold under agreements to repurchase 1,950 2,627 2,356
Corporate and subordinated debentures 12,968 5,641 5,293
Other borrowings 13,204 12,364 891
Total interest expense 83,564 86,552 53,992
Net interest income 826,465 504,275 513,216
Provision for credit losses 235,989 12,777 13,783
Net interest income after provision for credit losses 590,476 491,498 499,433
Noninterest income:      
Securities gains (losses), net 50 2,711 (655)
Recoveries on acquired loans   6,847 9,117
Other 26,389 8,872 10,552
Total noninterest income 311,140 143,565 145,749
Noninterest expense:      
Salaries and employee benefits 416,599 234,747 233,130
Occupancy expense 75,587 47,457 49,165
Information services expense 59,843 35,477 34,322
OREO expense and loan related 3,568 3,242 3,510
Pension plan termination expense   9,526  
Amortization of intangibles 26,992 13,084 14,209
Supplies, printing and postage expense 8,679 5,881 5,839
Professional fees 14,033 10,325 8,883
FDIC assessment and other regulatory charges 10,713 4,545 8,405
Advertising and marketing 4,092 4,309 4,221
Merger and branch consolidation related expense 85,906 4,552 29,868
Swap termination expense 38,787    
Other 52,845 31,493 29,375
Total noninterest expense 797,644 404,638 420,927
Earnings:      
Income before provision for income taxes 103,972 230,425 224,255
Provision (benefit) for income taxes (16,660) 43,942 45,384
Net income $ 120,632 $ 186,483 $ 178,871
Earnings per common share:      
Basic (in dollars per share) $ 2.20 $ 5.40 $ 4.90
Diluted (in dollars per share) $ 2.19 $ 5.36 $ 4.86
Weighted average common shares outstanding:      
Basic (in shares) 54,756 34,561 36,530
Diluted (in shares) 55,063 34,797 36,776
Fees on deposit accounts      
Noninterest income:      
Noninterest income $ 84,319 $ 75,435 $ 81,649
Mortgage banking income      
Noninterest income:      
Noninterest income 106,202 17,564 13,590
Trust and investment services income      
Noninterest income:      
Noninterest income 29,437 29,244 30,229
Correspondent banking and capital market income      
Noninterest income:      
Noninterest income $ 64,743 $ 2,892 $ 1,267