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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2016
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS [Abstract] |
Gross Carrying Amount and Accumulated Amortization for Each Type of Identifiable Intangible Asset | The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows:
|  | December 31, 2016 |  |  | December 31, 2015 |
(000's omitted) |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Amortizing intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 39,688 |  |  | $ | (32,581 | ) |  | $ | 7,107 |  |  | $ | 39,688 |  |  | $ | (29,899 | ) |  | $ | 9,789 |
Other intangibles |  |  | 17,853 |  |  |  | (9,258 | ) |  |  | 8,595 |  |  |  | 17,565 |  |  |  | (6,460 | ) |  |  | 11,105 |
Total amortizing intangibles |  | $ | 57,541 |  |  | $ | (41,839 | ) |  | $ | 15,702 |  |  | $ | 57,253 |  |  | $ | (36,359 | ) |  | $ | 20,894 |
Estimated Aggregate Amortization Expense | The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows:
2017 |  | $ | 4,413 |
2018 |  |  | 3,566 |
2019 |  |  | 2,782 |
2020 |  |  | 2,119 |
2021 |  |  | 1,531 |
Thereafter |  |  | 1,291 |
Total |  | $ | 15,702 |
Components of Goodwill | Shown below are the components of the Company’s goodwill at December 31, 2016 and 2015:
(000’s omitted) |  | Year Ended December 31, 2014 |  |  | Activity |  |  | Year Ended December 31, 2015 |  |  | Activity |  |  | Year Ended December 31, 2016 |
Goodwill |  | $ | 379,998 |  |  | $ | 88,078 |  |  | $ | 468,076 |  |  | $ | 1,890 |  |  | $ | 469,966 |
Accumulated impairment |  |  | (4,824 | ) |  |  | 0 |  |  |  | (4,824 | ) |  |  | 0 |  |  |  | (4,824 | )
Goodwill, net |  | $ | 375,174 |  |  | $ | 88,078 |  |  | $ | 463,252 |  |  | $ | 1,890 |  |  | $ | 465,142 |
Changes in Carrying Value of MSRs and Associated Valuation Allowance | The following table summarizes the changes in carrying value of MSRs and the associated valuation allowance:
(000’s omitted) |  | 2016 |  |  | 2015 |
Carrying value before valuation allowance at beginning of period |  | $ | 1,472 |  |  | $ | 1,089 |
Additions |  |  | 481 |  |  |  | 403 |
Oneida acquisition |  |  | 0 |  |  |  | 389 |
Amortization |  |  | (518 | ) |  |  | (409 | )
Carrying value before valuation allowance at end of period |  |  | 1,435 |  |  |  | 1,472 |
Valuation allowance balance at beginning of period |  |  | 0 |  |  |  | 0 |
Impairment charges |  |  | (226 | ) |  |  | (133 | )
Impairment recoveries |  |  | 226 |  |  |  | 133 |
Valuation allowance balance at end of period |  |  | 0 |  |  |  | 0 |
Net carrying value at end of period |  | $ | 1,435 |  |  | $ | 1,472 |
Fair value of MSRs at end of period |  | $ | 1,928 |  |  | $ | 1,962 |
Principal balance of loans sold during the year |  | $ | 45,852 |  |  | $ | 35,491 |
Principal balance of loans serviced for others |  | $ | 365,374 |  |  | $ | 377,909 |
Custodial escrow balances maintained in connection with loans serviced for others |  | $ | 5,603 |  |  | $ | 5,700 |
Summary 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:
|  | 2016 |  |  | 2015 |
Weighted-average contractual life (in years) |  |  | 20.8 |  |  |  | 19.9 |
Weighted-average constant prepayment rate (CPR) |  |  | 15.1 | % |  |  | 14.9 | %
Weighted-average discount rate |  |  | 3.5 | % |  |  | 3.3 | %

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- Definition Tabular disclosure of all information related to the key inputs and assumptions used in measuring the fair value of assets obtained or liabilities incurred, as the result of a sale of financial assets, relating to the transferor's continuing involvement, if any, at the time of securitization, asset-backed financing arrangement, or similar transfer (including at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses, including expected static pool losses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107207-111719 + Details
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