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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]  
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, 2021, and December 31, 2020, are presented in the table below, in thousands:
 September 30, 2021December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortizing intangible assets:    
Core deposit intangibles$101,185 $66,169 $35,016 $101,185 $58,970 $42,215 
Customer relationship intangibles1,177 1,036 141 1,177 1,009 168 
Mortgage servicing rights12,323 6,522 5,801 11,268 6,079 5,189 
Commercial servicing rights7,054 6,504 550 7,054 6,191 863 
Total$121,739 $80,231 $41,508 $120,684 $72,249 $48,435 
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		Customer
Relationship
Intangibles		Mortgage
Servicing
Rights		Commercial
Servicing
Rights		 
 
Total
Three months ending December 31, 2021$2,160 $9 $304 $51 $2,524 
Year ending December 31, 
20227,702 34 1,374 181 9,291 
20236,739 33 1,178 130 8,080 
20245,591 33 982 91 6,697 
20254,700 32 785 97 5,614 
20263,533 — 589 — 4,122 
Thereafter4,591 — 589 — 5,180 
Total$35,016 $141 $5,801 $550 $41,508 
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, 2021, and December 31, 2020:
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, 2021$1,622 $1,187 $435 $6,340 $4,614 $1,726 
December 31, 2020$1,522 $1,100 $422 $5,445 $4,089 $1,356 

The following table summarizes, in thousands, the book value and the fair value of each tranche of the commercial servicing rights at September 30, 2021, and December 31, 2020.
Book Value
Less than
20 Years		Fair Value
Less than
20 Years		Book Value
More than
20 Years		Fair Value
More than
20 Years
September 30, 2021$51 $211 $499 $747 
December 31, 2020$87 $203 $776 $1,085 
Mortgage servicing rights  
Finite-Lived Intangible Assets [Line Items]  
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, 2021, and September 30, 2020:
 20212020
Balance at January 1,$5,189 $5,621 
Originations1,055 2,571 
Amortization(1,029)(1,693)
Valuation adjustment586 (1,676)
Balance at period end$5,801 $4,823 
Mortgage servicing rights, net to servicing portfolio0.82 %0.68 %
Commercial servicing rights  
Finite-Lived Intangible Assets [Line Items]  
Summary of Changes in Servicing Rights
The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the nine months ended September 30, 2021, and September 30, 2020:
20212020
Balance at January 1,$863 $1,115 
Originations— 62 
Amortization(313)(248)
Balance at period end $550 $929 
Fair value of commercial servicing rights $958 $1,497 
Commercial servicing rights, net to servicing portfolio 1.04 %1.31 %