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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 9 Months Ended
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Sep. 30, 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 three and nine months ended September 30, 2018 and 2017.
| Three Months Ended |  | Nine Months Ended
(Dollars in thousands) | September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Noninterest income |  |  |  |  |  |  |
Service charges on deposits | $ | 926 |  |  | $ | 876 |  |  | $ | 2,599 |  |  | $ | 2,531 |
Trust and investment management income | 1,668 |  |  | 1,551 |  |  | 5,037 |  |  | 4,620 |
Brokerage income | 455 |  |  | 424 |  |  | 1,514 |  |  | 1,409 |
Merchant and bankcard fees (interchange income) | 681 |  |  | 647 |  |  | 2,047 |  |  | 1,950 |
Revenue from contracts with customers | 3,730 |  |  | 3,498 |  |  | 11,197 |  |  | 10,510 |
Other service charges | 409 |  |  | 119 |  |  | 1,189 |  |  | 440 |
Mortgage banking activities | 735 |  |  | 797 |  |  | 2,049 |  |  | 2,113 |
Income from life insurance | 533 |  |  | 275 |  |  | 1,101 |  |  | 814 |
Other income | 56 |  |  | 34 |  |  | 272 |  |  | 147 |
Investment securities gains | 29 |  |  | 533 |  |  | 891 |  |  | 1,190 |
Total noninterest income | $ | 5,492 |  |  | $ | 5,256 |  |  | $ | 16,699 |  |  | $ | 15,214 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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