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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest income:      
Interest and fees on loans $ 308,355 $ 314,779 $ 308,210
Interest and dividends on taxable investments 68,607 62,538 65,904
Interest and dividends on nontaxable investments 10,458 11,961 11,613
Total interest income 387,420 389,278 385,727
Interest expense:      
Interest on deposits 11,631 16,761 20,460
Interest on borrowings 930 1,569 1,848
Interest on subordinated notes payable 154 670 346
Interest on subordinated debt held by unconsolidated subsidiary trusts 293 1,875 3,898
Total interest expense 13,008 20,875 26,552
Net interest income 374,412 368,403 359,175
Provision for credit losses (8,839) 14,212 8,430
Net interest income after provision for credit losses 383,251 354,191 350,745
Noninterest revenues:      
Deposit service fees 59,212 57,370 65,602
Mortgage banking 1,772 5,301 523
Other banking services 3,674 3,753 4,358
Employee benefit services 114,328 101,329 97,167
Insurance services 33,992 32,372 32,199
Wealth management services 33,240 27,879 25,869
Unrealized gain (loss) on equity securities 17 (6) 19
Gain on debt extinguishment 0 421 0
Gain on sales of investment securities, net 0 0 4,882
Total noninterest revenues 246,235 228,419 230,619
Noninterest expenses:      
Salaries and employee benefits 241,501 228,384 219,916
Occupancy and equipment 41,240 40,732 39,850
Data processing and communications 51,003 45,755 41,407
Amortization of intangible assets 14,051 14,297 15,956
Legal and professional fees 11,723 11,605 10,783
Business development and marketing 9,319 9,463 11,416
Litigation accrual (100) 2,950 0
Acquisition expenses 701 4,933 8,608
Acquisition-related contingent consideration adjustment 200 0 0
Other expenses 18,500 18,415 24,090
Total noninterest expenses 388,138 376,534 372,026
Income before income taxes 241,348 206,076 209,338
Income taxes 51,654 41,400 40,275
Net income $ 189,694 $ 164,676 $ 169,063
Basic earnings per share (in dollars per share) $ 3.51 $ 3.10 $ 3.26
Diluted earnings per share (in dollars per share) $ 3.48 $ 3.08 $ 3.23