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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Identifiable Intangible Assets |  |
Gross Carrying Amount | $ 197,186,000 | $ 186,202,000
Accumulated Amortization | (136,190,000) | (120,976,000)
Net Carrying Amount | 60,996,000 | 65,226,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
2023 | 13,698,000 |
2024 | 11,601,000 |
2025 | 9,883,000 |
2026 | 8,745,000 |
2027 | 3,333,000 |
Thereafter | 13,736,000 |
Net Carrying Amount | 60,996,000 | 65,226,000
Components of goodwill |  |
Goodwill, beginning of period | 799,109,000 | 793,708,000
Goodwill, activity | 42,732,000 | 5,401,000
Goodwill, end of period | 841,841,000 | 799,109,000
Changes in carrying value of MSRs and the associated valuation allowance |  |
Carrying value before valuation allowance at beginning of period | 1,144,000 | 1,430,000
Additions | 83,000 | 233,000
Acquisitions | 2,879,000 | 0
Amortization | (801,000) | (519,000)
Carrying value before valuation allowance at end of period | 3,305,000 | 1,144,000
Valuation allowance balance at beginning of period | 0 | (219,000)
Impairment charges | (676,000) | (55,000)
Impairment recoveries | 0 | 274,000
Valuation allowance balance at end of period | (676,000) | 0
Net carrying value at end of period | 2,629,000 | 1,144,000
Fair value of MSRs at end of period | 5,107,000 | 1,469,000
Principal balance of mortgage loans sold during the year | 5,309,000 | 20,133,000
Principal balance of loans serviced for others | 583,109,000 | 296,506,000
Custodial escrow balances maintained in connection with loans serviced for others | 10,534,000 | 4,934,000
Impairment loss for goodwill | $ 0 | $ 0
Key economic assumptions used to estimate the value of the MSRs |  |
Weighted-average contractual life (in years) | 21 years 7 months 6 days | 21 years 4 months 24 days
Weighted-average constant prepayment rate (CPR) | 7.70% | 24.50%
Weighted-average discount rate | 4.90% | 2.60%
Core deposit intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | $ 77,373,000 | $ 69,403,000
Accumulated Amortization | (65,069,000) | (60,316,000)
Net Carrying Amount | 12,304,000 | 9,087,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | 12,304,000 | 9,087,000
Other intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | 119,813,000 | 116,799,000
Accumulated Amortization | (71,121,000) | (60,660,000)
Net Carrying Amount | 48,692,000 | 56,139,000
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | $ 48,692,000 | $ 56,139,000

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