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REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Noninterest income disaggregated by major source, for the three months ended March 31, 2020 and 2019, consisted of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended
​ | ​ | March 31, | ​ | March 31,
​ | ​ | 2020 | ​ | 2019
Noninterest income: |  | ​ |  |  | ​ |
Deposit Service Charges (1): |  | ​ |  |  | ​ |
Overdraft fees | ​ | $ | 5,765 | ​ | $ | 5,782
Maintenance fees & other | ​ |  | 1,813 | ​ |  | 1,376
Other service charges, commissions, and fees (1) | ​ |  | 1,624 | ​ |  | 1,664
Interchange fees(1) | ​ |  | 1,625 | ​ |  | 5,045
Fiduciary and asset management fees (1): | ​ |  | ​ | ​ |  | ​
Trust asset management fees | ​ |  | 2,827 | ​ |  | 1,339
Registered advisor management fees | ​ |  | 2,088 | ​ |  | 2,875
Brokerage management fees | ​ |  | 1,069 | ​ |  | 840
Mortgage banking income | ​ |  | 2,022 | ​ |  | 1,454
Gains (losses) on securities transactions | ​ |  | 1,936 | ​ |  | 151
Bank owned life insurance income | ​ |  | 2,049 | ​ |  | 2,055
Loan-related interest rate swap fees | ​ |  | 3,948 | ​ |  | 1,460
Other operating income (2) | ​ |  | 2,141 | ​ |  | 897
Total noninterest income (3) | ​ | $ | 28,907 | ​ | $ | 24,938
(1) Income within scope of Topic 606. (2) Entire balance is within scope of Topic 606 for the three months ended March 31, 2020. Includes income within the scope of Topic 606 of $813,000 for the three months ended March 31, 2019; the remaining balance is outside the scope of Topic 606. (3) Noninterest income for the discontinued mortgage segment is reported in Note 14 "Segment Reporting & Discontinued Operations."

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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