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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