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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Noninterest income disaggregated by major source for the three and nine months ended September 30, 2021 and 2020, consisted of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30, |  | September 30, | ​ | September 30,
​ | ​ | 2021 | ​ | 2020 |  | 2021 | ​ | 2020
Noninterest income: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |
Deposit Service Charges (1): |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |
Overdraft fees | ​ | $ | 4,648 | ​ | $ | 4,231 | ​ | $ | 11,864 | ​ | $ | 13,240
Maintenance fees & other | ​ |  | 2,550 | ​ |  | 1,810 | ​ |  | 7,450 | ​ |  | 5,309
Other service charges, commissions, and fees (1) | ​ |  | 1,534 | ​ |  | 1,621 | ​ |  | 4,970 | ​ |  | 4,600
Interchange fees(1) | ​ |  | 2,203 | ​ |  | 1,979 | ​ |  | 6,252 | ​ |  | 5,300
Fiduciary and asset management fees (1): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Trust asset management fees | ​ |  | 3,233 | ​ |  | 2,729 | ​ |  | 9,127 | ​ |  | 8,026
Registered advisor management fees | ​ |  | 2,510 | ​ |  | 2,224 | ​ |  | 7,299 | ​ |  | 6,402
Brokerage management fees | ​ |  | 1,286 | ​ |  | 1,092 | ​ |  | 3,897 | ​ |  | 3,115
Mortgage banking income | ​ |  | 4,818 | ​ |  | 8,897 | ​ |  | 17,692 | ​ |  | 16,744
Gains on securities transactions | ​ |  | 9 | ​ |  | 18 | ​ |  | 87 | ​ |  | 12,293
Bank owned life insurance income | ​ |  | 2,727 | ​ |  | 3,421 | ​ |  | 8,202 | ​ |  | 7,498
Loan-related interest rate swap fees | ​ |  | 1,102 | ​ |  | 3,170 | ​ |  | 4,176 | ​ |  | 12,602
Other operating income (2) | ​ |  | 3,318 | ​ |  | 3,215 | ​ |  | 8,372 | ​ |  | 4,116
Total noninterest income | ​ | $ | 29,938 | ​ | $ | 34,407 | ​ | $ | 89,388 | ​ | $ | 99,245
(1) Income within scope of Topic 606. (2) Includes a $1.8 million loss related to the termination of a cash flow hedge for the nine months ended September 30, 2020.

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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=123351226&loc=SL49130545-203045 + Details
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