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GOODWILL, CORE DEPOSIT INTANGIBLES AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets The gross carrying amount of other intangible assets and the associated accumulated amortization at December 31, 2020, and December 31, 2019, are presented in the table below, in thousands:
 December 31, 2020December 31, 2019
 
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Amortizing intangible assets:    
Core deposit intangibles$101,185 $58,970 $42,215 $96,821 $48,338 $48,483 
Customer relationship intangible1,177 1,009 168 1,177 972 205 
Mortgage servicing rights11,268 6,079 5,189 7,886 2,265 5,621 
   Commercial servicing rights7,054 6,191 863 6,952 5,837 1,115 
Total$120,684 $72,249 $48,435 $112,836 $57,412 $55,424 
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
Intangible
Mortgage
Servicing
Rights
Commercial
Servicing
Rights
 
 
Total
Year ending December 31, 
2021$9,360 $35 $1,297 $251 $10,943 
20227,702 34 1,112 222 9,070 
20236,739 34 927 162 7,862 
20245,591 33 741 110 6,475 
20254,700 32 556 118 5,406 
Thereafter8,123 — 556 — 8,679 
Total$42,215 $168 $5,189 $863 $48,435 
Summary of Changes in Servicing Rights
The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the twelve months ended December 31, 2020, and December 31, 2019:
 20202019
Balance at January 1,$5,621 $29,363 
Originations3,383 893 
Amortization(2,037)(3,168)
Sale of mortgage servicing rights— (20,556)
Valuation allowance on servicing rights(1,778)(911)
Balance at December 31,$5,189 $5,621 
Fair value of mortgage servicing rights $5,189 $5,621 
Mortgage servicing rights, net to servicing portfolio0.70 %0.91 %
The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the twelve months ended December 31, 2020, and December 31, 2019:
20202019
Balance at January 1,$1,115 $1,709 
Originations102 118 
Amortization(354)(712)
Balance at December 31,$863 $1,115 
Fair value of commercial servicing rights$1,288 $1,594 
Commercial servicing rights, net to servicing portfolio1.30 %1.36 %
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 each respective subsidiary at December 31, 2020, and December 31, 2019:
December 31, 2020
Book Value
15-Year
Tranche
Fair Value
15-Year
Tranche
Impairment
15-Year
Tranche
Book Value
30-Year
Tranche
Fair Value
30-Year
Tranche
Impairment
30-Year
Tranche
First Bank & Trust1,522 1,100 422 5,445 4,089 1,356 
Total$1,522 $1,100 $422 $5,445 $4,089 $1,356 
December 31, 2019
First Bank & Trust1,482 1,368 114 5,050 4,253 797 
Total$1,482 $1,368 $114 $5,050 $4,253 $797 

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 each respective subsidiary at December 31, 2020, and December 31, 2019:
Book Value-
Less than
20 Years
Fair Value-
Less than
20 Years
Impairment-
Less than
20 Years
Book Value-
More than
20 Years
Fair Value-
More than
20 Years
Impairment-
More than
20 Years
December 31, 2020
Premier Valley Bank— 7 — 86 143 — 
Wisconsin Bank & Trust87 196 — 690 942 — 
Total$87 $203 $— $776 $1,085 $— 
December 31, 2019
Premier Valley Bank1 13 — 135 161 — 
Wisconsin Bank & Trust128 272 — 851 1,148 — 
Total$129 $285 $— $986 $1,309 $—