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NON-INTEREST INCOME - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 4,922 | $ 5,186
Trust management fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,525 | 2,741
Financial services fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 233 | 221
Interchange fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,031 | 1,024
Customer deposit fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 907 | 979
Other customer service fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 226 | $ 221

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