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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest income |  |  |
Loans | $ 88,929 | $ 73,718 | $ 58,808
Investment securities | 2,101 | 1,801 | 1,617
Federal funds sold and interest-bearing deposits with banks | 1,622 | 1,138 | 784
Total interest income | 92,652 | 76,657 | 61,209
Interest expense |  |  |
Deposits | 23,730 | 14,836 | 7,373
Borrowings | 1,653 | 1,669 | 2,960
Total interest expense | 25,383 | 16,505 | 10,333
Net interest income | 67,269 | 60,152 | 50,876
Provision for loan losses | 2,300 | 1,900 | 2,000
Net interest income after provision for loan losses | 64,969 | 58,252 | 48,876
Noninterest income |  |  |
Mortgage banking income | 9,923 | 5,544 | 5,152
Service fees on deposit accounts | 1,061 | 1,040 | 1,168
ATM and debit card income | 1,728 | 1,490 | 1,172
Income from bank owned life insurance | 1,001 | 878 | 811
Gain on sale of investment securities, net | 727 | 7 | 4
Loss on extinguishment of debt | (1,496) |  |
Other income | 2,039 | 1,242 | 1,030
Total noninterest income | 14,983 | 10,201 | 9,337
Noninterest expenses |  |  |
Compensation and benefits | 29,025 | 25,561 | 21,791
Occupancy | 5,527 | 5,049 | 4,121
Outside service and data processing costs | 4,187 | 3,302 | 3,158
Insurance | 813 | 1,284 | 1,146
Professional fees | 1,699 | 1,574 | 1,362
Marketing | 941 | 856 | 737
Other | 2,281 | 2,137 | 2,237
Total noninterest expenses | 44,473 | 39,763 | 34,552
Income before income tax expense | 35,479 | 28,690 | 23,661
Income tax expense | 7,621 | 6,401 | 10,616
Net income available to common shareholders | $ 27,858 | $ 22,289 | $ 13,045
Earnings per common share |  |  |
Basic | $ 3.70 | $ 3.02 | $ 1.86
Diluted | $ 3.58 | $ 2.88 | $ 1.76
Weighted average common shares outstanding |  |  |
Basic | 7,528,283 | 7,384,200 | 7,005,703
Diluted | 7,772,544 | 7,737,495 | 7,393,377

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