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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020, and December 31, 2019, are presented in the table below, in thousands:
 June 30, 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$96,821  $53,996  $42,825  $96,821  $48,338  $48,483  
Customer relationship intangibles1,177  991  186  1,177  972  205  
Mortgage servicing rights9,375  4,890  4,485  7,886  2,265  5,621  
Commercial servicing rights6,990  6,006  984  6,952  5,837  1,115  
Total$114,363  $65,883  $48,480  $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
Intangibles		Mortgage
Servicing
Rights		Commercial
Servicing
Rights		 
 
Total
Six months ending December 31, 2020$4,918  $18  $1,524  $141  $6,601  
Year ending December 31, 
20218,691  35  740  261  9,727  
20227,102  34  635  232  8,003  
20236,202  34  529  157  6,922  
20245,108  33  423  98  5,662  
20254,265  32  317  95  4,709  
Thereafter6,539  —  317  —  6,856  
Total$42,825  $186  $4,485  $984  $48,480  
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 June 30, 2020, and December 31, 2019:

June 30, 2020Book Value 15-Year TrancheFair Value 15-Year TrancheImpairment 15-Year TrancheBook Value 30-Year TrancheFair Value 30-Year TrancheImpairment 30-Year Tranche
First Bank & Trust1,533  1,017  516  5,478  3,469  2,009  
Total$1,533  $1,017  $516  $5,478  $3,469  $2,009  
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 June 30, 2020, and December 31, 2019:

June 30, 2020Book 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
Premier Valley Bank1  11  —  111  140  —  
Wisconsin Bank & Trust99  236  —  773  1,030  —  
Total$100  $247  $—  $884  $1,170  $—  
December 31, 2019
Premier Valley Bank1  13  —  135  161  —  
Wisconsin Bank & Trust128  272  —  851  1,148  —  
Total$129  $285  $—  $986  $1,309  $—  
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, 2020, and June 30, 2019:

 20202019
Balance at January 1,$5,621  $29,363  
Originations1,490  342  
Amortization(1,070) (2,395) 
Sale of mortgage servicing rights—  (20,556) 
Valuation allowance (1,556) (953) 
Balance at period end$4,485  $5,801  
Mortgage servicing rights, net to servicing portfolio0.68 %0.92 %
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, 2020, and June 30, 2019:

20202019
Balance at January 1,$1,115  $1,709  
Originations38  73  
Amortization(169) (403) 
Balance at period end $984  $1,379  
Fair value of commercial servicing rights $1,417  $1,851  
Commercial servicing rights, net to servicing portfolio 1.32 %1.52 %