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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 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 June 30, 2021, and December 31, 2020, are presented in the table below, in thousands:
 June 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 $63,883 $37,302 $101,185 $58,970 $42,215 
Customer relationship intangibles1,177 1,027 150 1,177 1,009 168 
Mortgage servicing rights11,971 6,412 5,559 11,268 6,079 5,189 
Commercial servicing rights7,054 6,412 642 7,054 6,191 863 
Total$121,387 $77,734 $43,653 $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
Six months ending December 31, 2021$4,446 $18 $648 $110 $5,222 
Year ending December 31, 
20227,702 34 1,228 194 9,158 
20236,739 33 1,052 139 7,963 
20245,591 33 877 96 6,597 
20254,700 32 702 103 5,537 
20263,533 — 526 — 4,059 
Thereafter4,591 — 526 — 5,117 
Total$37,302 $150 $5,559 $642 $43,653 
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 June 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
June 30, 2021$1,627 $1,157 $470 $6,287 $4,402 $1,885 
December 31, 2020$1,522 $1,100 $422 $5,445 $4,089 $1,356 

The following table summarizes, in thousands, the book value, the fair value of each tranche of the commercial servicing rights and any recorded valuation allowance at June 30, 2021, and December 31, 2020:
Book Value
Less than
20 Years		Fair Value
Less than
20 Years		Valuation Allowance
15-Year Tranche		Book Value
More than
20 Years		Fair Value
More than
20 Years		Valuation Allowance
30-Year Tranche
June 30, 2021$58 $170 $— $584 $934 $— 
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 six months ended June 30, 2021, and June 30, 2020:
 20212020
Balance at January 1,$5,189 $5,621 
Originations703 1,490 
Amortization(724)(1,070)
Valuation adjustment391 (1,556)
Balance at period end$5,559 $4,485 
Mortgage servicing rights, net to servicing portfolio0.77 %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 six months ended June 30, 2021, and June 30, 2020:
20212020
Balance at January 1,$863 $1,115 
Originations— 38 
Amortization(221)(169)
Balance at period end $642 $984 
Fair value of commercial servicing rights $1,104 $1,417 
Commercial servicing rights, net to servicing portfolio 1.12 %1.32 %