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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2022
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
Schedule of gross carrying amount and accumulated amortization for each type of identifiable intangible asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 |  | December 31, 2021
​ | ​ | Gross | ​ | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | ​ | Net
​ |  | Carrying |  | Accumulated |  | Carrying |  | Carrying |  | Accumulated |  | Carrying
(000’s omitted) | ​ | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Amortizing intangible assets: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Core deposit intangibles | ​ | $ | 77,373 | ​ | $ | (65,069) | ​ | $ | 12,304 | ​ | $ | 69,403 | ​ | $ | (60,316) | ​ | $ | 9,087
Other intangibles | ​ |  | 119,813 | ​ |  | (71,121) | ​ |  | 48,692 | ​ |  | 116,799 | ​ |  | (60,660) | ​ |  | 56,139
Total amortizing intangibles | ​ | $ | 197,186 | ​ | $ | (136,190) | ​ | $ | 60,996 | ​ | $ | 186,202 | ​ | $ | (120,976) | ​ | $ | 65,226
​
Schedule of estimated aggregate amortization expense for each of five succeeding fiscal years | The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows (000’s omitted): ​
​ | ​ | ​ | ​
Year |  | Amount
2023 | ​ | $ | 13,698
2024 | ​ | ​ | 11,601
2025 | ​ |  | 9,883
2026 | ​ |  | 8,745
2027 | ​ |  | 3,333
Thereafter | ​ |  | 13,736
Total | ​ | $ | 60,996
​
Schedule of components of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, | ​ | ​ | ​ | ​ | December 31, | ​ | ​ | ​ | ​ | December 31,
(000’s omitted) |  | ​ | 2020 |  | Activity |  | 2021 |  | Activity |  | 2022
Goodwill | ​ | $ | 793,708 | ​ | $ | 5,401 | ​ | $ | 799,109 | ​ | $ | 42,732 | ​ | $ | 841,841
​
Schedule of changes in carrying value of MSRs and associated valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted) |  | 2022 |  | 2021
Carrying value before valuation allowance at beginning of period | ​ | $ | 1,144 | ​ | $ | 1,430
Additions | ​ |  | 83 | ​ |  | 233
Acquisitions | ​ |  | 2,879 | ​ |  | 0
Amortization | ​ |  | (801) | ​ |  | (519)
Carrying value before valuation allowance at end of period | ​ |  | 3,305 | ​ |  | 1,144
Valuation allowance balance at beginning of period | ​ |  | 0 | ​ |  | (219)
Impairment charges | ​ |  | (676) | ​ |  | (55)
Impairment recoveries | ​ |  | 0 | ​ |  | 274
Valuation allowance balance at end of period | ​ |  | (676) | ​ |  | 0
Net carrying value at end of period | ​ | $ | 2,629 | ​ | $ | 1,144
Fair value of MSRs at end of period | ​ | $ | 5,107 | ​ | $ | 1,469
Principal balance of mortgage loans sold during the year | ​ | $ | 5,309 | ​ | $ | 20,133
Principal balance of loans serviced for others | ​ | $ | 583,109 | ​ | $ | 296,506
Custodial escrow balances maintained in connection with loans serviced for others | ​ | $ | 10,534 | ​ | $ | 4,934
​
Schedule of key economic assumptions used to estimate value of MSRs | The following table summarizes the key economic assumptions used to estimate the value of the MSRs at December 31: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021 |
Weighted-average contractual life (in years) |  | 21.6 |  | 21.4 | ​
Weighted-average constant prepayment rate (CPR) |  | 7.7 | % | 24.5 | %
Weighted-average discount rate |  | 4.9 | % | 2.6 | %

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