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Goodwill, Core Deposit Intangibles and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, and December 31, 2018, are presented in the table below, in thousands:
 December 31, 2019December 31, 2018
 
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Amortizing intangible assets:    
Core deposit intangibles$96,821  $48,338  $48,483  $83,640  $36,403  $47,237  
Customer relationship intangible1,177  972  205  1,177  935  242  
Mortgage servicing rights7,886  2,265  5,621  42,228  12,865  29,363  
   Commercial servicing rights6,952  5,837  1,115  6,834  5,125  1,709  
Total$112,836  $57,412  $55,424  $133,879  $55,328  $78,551  
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, 
2020$10,577  $37  $1,405  $301  $12,320  
20218,691  35  1,205  267  10,198  
20227,102  34  1,004  235  8,375  
20236,201  34  803  155  7,193  
20245,108  33  602  86  5,829  
Thereafter10,804  32  602  71  11,509  
Total$48,483  $205  $5,621  $1,115  $55,424  
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, 2019, and December 31, 2018:
 20192018
Balance at January 1$29,363  $23,248  
Originations893  5,045  
Amortization(3,168) (5,867) 
Sale of mortgage servicing rights(20,556) —  
Acquired mortgage servicing rights—  6,995  
Valuation allowance on servicing rights(911) (58) 
Balance at December 31$5,621  $29,363  
Fair value of mortgage servicing rights $5,621  $48,680  
Mortgage servicing rights, net to servicing portfolio0.91 %0.72 %
The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the twelve months ended December 31, 2019, and December 31, 2018:
20192018
Balance at January 1,$1,709  $2,609  
Originations118  115  
Amortization(712) (1,027) 
Purchased commercial servicing rights —  —  
Valuation allowance on servicing rights —  12  
Balance at December 31,$1,115  $1,709  
Fair value of commercial servicing rights$1,594  $2,134  
Commercial servicing rights, net to servicing portfolio1.36 %1.59 %
Schedule of Servicing Asset at Fair Value and Amortized Cost
The following table summarizes, in thousands, the book value, the fair value of each tranche of the mortgage servicing rights and any recorded valuation allowance at each respective subsidiary at December 31, 2019, and December 31, 2018:
December 31, 2019
Book Value
15-Year
Tranche
Fair Value
15-Year
Tranche
Impairment
15-Year
Tranche
Book Value
30-Year
Tranche
Fair Value
30-Year
Tranche
Impairment
30-Year
Tranche
Dubuque Bank and Trust Company$—  $—  $—  $—  $—  $—  
First Bank & Trust1,482  1,368  114  5,050  4,253  797  
Total$1,482  $1,368  $114  $5,050  $4,253  $797  
December 31, 2018
Dubuque Bank and Trust Company$2,195  $4,636  $—  $20,025  $36,901  $—  
First Bank & Trust1,685  1,665  20  5,516  5,478  38  
Total$3,880  $6,301  $20  $25,541  $42,379  $38  

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, 2019, and December 31, 2018:
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, 2019
Citywide Banks$—  $—  $—  $—  $—  $—  
Premier Valley Bank1  13  —  135  161  —  
Wisconsin Bank & Trust128  272  —  851  1,148  —  
Total$129  $285  $—  $986  $1,309  $—  
December 31, 2018
Citywide Banks$1  $6  $—  $18  $20  $—  
Premier Valley Bank45  74  —  178  184  —  
Wisconsin Bank & Trust249  411  —  1,218  1,439  —  
Total$295  $491  $—  $1,414  $1,643  $—