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Goodwill, Core Deposit Intangibles and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, and December 31, 2017, are presented in the table below, in thousands:
 
December 31, 2018
 
December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortizing intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Core deposit intangibles
$
83,640

 
$
36,403

 
$
47,237

 
$
62,008

 
$
27,086

 
$
34,922

Customer relationship intangible
1,177

 
935

 
242

 
1,177

 
896

 
281

Mortgage servicing rights
42,228

 
12,865

 
29,363

 
42,139

 
18,891

 
23,248

   Commercial servicing rights
6,834

 
5,125

 
1,709

 
6,719

 
4,110

 
2,609

Total
$
133,879

 
$
55,328

 
$
78,551

 
$
112,043

 
$
50,983

 
$
61,060
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,
 
 
 
 
 
 
 
 
 
2019
$
9,452

 
$
38

 
$
7,341

 
$
463

 
$
17,294

2020
8,230

 
37

 
6,292

 
365

 
14,924

2021
7,036

 
35

 
5,243

 
320

 
12,634

2022
5,634

 
34

 
4,195

 
267

 
10,130

2023
4,934

 
34

 
3,146

 
163

 
8,277

Thereafter
11,951

 
64

 
3,146

 
131

 
15,292

Total
$
47,237

 
$
242

 
$
29,363

 
$
1,709

 
$
78,551
Summary of Changes in Servicing Rights
The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the twelve months ended December 31, 2018, and December 31, 2017:
 
2018
 
2017
Balance at January 1,
$
2,609

 
$
3,690

Originations
115

 
209

Amortization
(1,027
)
 
(1,311
)
Purchased commercial servicing rights
—

 
—

Valuation allowance on servicing rights
12

 
21

Balance at December 31,
$
1,709

 
$
2,609

Fair value of commercial servicing rights
$
2,134

 
$
3,221

Commercial servicing rights, net to servicing portfolio
1.59
%
 
1.87
%
The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the twelve months ended December 31, 2018, and December 31, 2017:
 
2018
 
2017
Balance at January 1
$
23,248

 
$
32,088

Originations
5,045

 
7,149

Amortization
(5,867
)
 
(9,049
)
Sale of mortgage servicing rights
—

 
(6,940
)
Acquired mortgage servicing rights
6,995

 
—

Valuation allowance on servicing rights
(58
)
 
—

Balance at December 31
$
29,363

 
$
23,248

Fair value of mortgage servicing rights
$
48,680

 
$
37,081

Mortgage servicing rights, net to servicing portfolio
0.72
%
 
0.65
%
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, 2018 and December 31, 2017:
December 31, 2018
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
$
2,195

 
$
4,636

 
$
—

 
$
20,025

 
$
36,901

 
$
—

First Bank & Trust
1,685

 
1,665

 
20

 
5,516

 
5,478

 
38

Total
$
3,880

 
$
6,301

 
$
20

 
$
25,541

 
$
42,379

 
$
38

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Dubuque Bank and Trust Company
$
2,858

 
$
4,988

 
$
—

 
$
20,390

 
$
32,093

 
$
—

Total
$
2,858

 
$
4,988

 
$
—

 
$
20,390

 
$
32,093

 
$
—


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, 2018 and December 31, 2017:
 
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, 2018
 
 
 
 
 
 
 
 
 
 
 
Citywide Banks
$
1

 
$
6

 
$
—

 
$
18

 
$
20

 
$
—

Premier Valley Bank
45

 
74

 
—

 
178

 
184

 
—

Wisconsin Bank & Trust
249

 
411

 
—

 
1,218

 
1,439

 
—

Total
$
295

 
$
491

 
$
—

 
$
1,414

 
$
1,643

 
$
—

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Citywide Banks
$
8

 
$
11

 
$
—

 
$
34

 
$
37

 
$
—

Premier Valley Bank
83

 
110

 
—

 
303

 
291

 
12

Wisconsin Bank & Trust
446

 
619

 
—

 
1,747

 
2,153

 
—

Total
$
537

 
$
740

 
$
—

 
$
2,084

 
$
2,481

 
$
12