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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Noninterest Income Disaggregated by Revenue Source | The following table presents our noninterest income disaggregated by revenue source for the years ended December 31.
(Dollars in thousands) | 2018 |  | 2017 |  | 2016
Noninterest income |  |  |  |  |
Service charges on deposits | $ | 3,578 |  | $ | 3,392 |  | $ | 3,285
Trust and investment management income | 6,576 |  | 6,400 |  | 5,091
Brokerage income | 2,035 |  | 1,896 |  | 1,933
Merchant and bankcard fees (interchange income) | 2,821 |  | 2,618 |  | 2,563
Revenue from contracts with customers | 15,010 |  | 14,306 |  | 12,872
Other service charges | 1,392 |  | 673 |  | 591
Mortgage banking activities | 2,663 |  | 2,919 |  | 3,412
Income from life insurance | 1,463 |  | 1,109 |  | 1,099
Other income | 320 |  | 190 |  | 345
Investment securities gains | 1,006 |  | 1,190 |  | 1,420
Total noninterest income | $ | 21,854 |  | $ | 20,387 |  | $ | 19,739

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