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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets The gross carrying amount of these intangible assets and the associated accumulated amortization at September 30, 2022, and December 31, 2021, are presented in the table below, in thousands:
 September 30, 2022December 31, 2021
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortizing intangible assets:    
Core deposit intangibles$101,185 $74,190 $26,995 $101,185 $68,330 $32,855 
Customer relationship intangibles1,177 1,177 — 1,177 1,044 133 
Mortgage servicing rights14,008 5,629 8,379 12,790 6,378 6,412 
Commercial servicing rights7,054 7,054 — 7,054 6,576 478 
Total$123,424 $88,050 $35,374 $122,206 $82,328 $39,878 
Schedule of Estimated Future Amortization Expense of Amortizable Intangible Assets
The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands:
 Core Deposit
Intangibles		Mortgage Servicing
Rights		 
 
Total
Three months ending December 31, 2022$1,841 $147 $1,988 
Year ending December 31, 
20236,739 2,058 8,797 
20245,591 1,764 7,355 
20254,700 1,470 6,170 
20263,533 1,176 4,709 
20272,601 882 3,483 
Thereafter1,990 882 2,872 
Total$26,995 $8,379 $35,374 
Summary of Changes in Servicing Rights
The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the nine months ended September 30, 2022, and September 30, 2021:
 20222021
Balance at January 1,$6,412 $5,189 
Originations1,218 1,055 
Amortization(909)(1,029)
Valuation adjustment1,658 586 
Balance at period end$8,379 $5,801 
Mortgage servicing rights, net to servicing portfolio1.14 %0.82 %
Schedule of Servicing Asset at Fair Value and Amortized Cost
The following table summarizes, in thousands, the book value, the fair value of each tranche of the mortgage servicing rights and any recorded valuation allowance at September 30, 2022, and December 31, 2021:
Book Value 15-Year TrancheFair Value 15-Year TrancheValuation Allowance
15-Year Tranche		Book Value 30-Year TrancheFair Value 30-Year TrancheValuation Allowance
30-Year Tranche
September 30, 2022$1,540 $1,871 $— $6,839 $8,176 $— 
December 31, 2021$1,607 $1,280 $327 $6,463 $5,132 $1,331 

The fair value of mortgage servicing rights is calculated based upon a discounted cash flow analysis. Cash flow assumptions, including prepayment speeds, servicing costs and escrow earnings of the mortgage servicing rights are considered in the
calculation. The following table presents key assumptions used to value the mortgage servicing rights as of September 30, 2022, and December 31, 2021, dollars in thousands:
As of
September 30, 2022December 31, 2021
Weighted average constant prepayment rate7.80 %13.40 %
Weighted average discount rate10.05 %9.02 %
Fair value of mortgage servicing rights$10,047 $6,412