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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Identifiable Intangible Assets |  |
Gross carrying amount | $ 186,202,000 | $ 159,865,000
Accumulated Amortization | (120,976,000) | (106,925,000)
Net Carrying Amount | 65,226,000 | 52,940,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
2022 | 13,668,000 |
2023 | 11,595,000 |
2024 | 9,782,000 |
2025 | 8,349,000 |
2026 | 7,494,000 |
Thereafter | 14,338,000 |
Net Carrying Amount | 65,226,000 | 52,940,000
Components of goodwill |  |
Goodwill, net, beginning of period | 793,708,000 | 773,810,000
Goodwill, net, activity | 5,401,000 | 19,898,000
Goodwill, net, end of period | 799,109,000 | 793,708,000
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Carrying value before valuation allowance at beginning of period | 1,430,000 | 972,000
Additions | 233,000 | 715,000
Acquisitions | 0 | 122,000
Amortization | (519,000) | (379,000)
Carrying value before valuation allowance at end of period | 1,144,000 | 1,430,000
Valuation allowance balance at beginning of period | (219,000) | (298,000)
Impairment charges | (55,000) | (150,000)
Impairment recoveries | 274,000 | 229,000
Valuation allowance balance at end of period | 0 | (219,000)
Net carrying value at end of period | 1,144,000 | 1,211,000
Fair value of MSRs at end of period | 1,469,000 | 1,384,000
Principal balance of mortgage loans sold during the year | 20,133,000 | 79,709,000
Principal balance of loans serviced for others | 296,506,000 | 351,759,000
Custodial escrow balances maintained in connection with loans serviced for others | $ 4,934,000 | $ 5,583,000
Key economic assumptions used to estimate the value of the MSRs [Abstract] |  |
Weighted-average contractual life | 21 years 4 months 24 days | 21 years 6 months
Weighted-average constant prepayment rate (CPR) | 24.50% | 30.40%
Weighted-average discount rate | 2.60% | 2.10%
Core deposit intangibles |  |
Identifiable Intangible Assets |  |
Gross carrying amount | $ 69,403,000 | $ 69,403,000
Accumulated Amortization | (60,316,000) | (55,572,000)
Net Carrying Amount | 9,087,000 | 13,831,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | 9,087,000 | 13,831,000
Other intangibles |  |
Identifiable Intangible Assets |  |
Gross carrying amount | 116,799,000 | 90,462,000
Accumulated Amortization | (60,660,000) | (51,353,000)
Net Carrying Amount | 56,139,000 | 39,109,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | $ 56,139,000 | $ 39,109,000

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