Goodwill, Core Deposit Premium and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

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 September 30, 2018, and December 31, 2017, are presented in the table below, in thousands:

	September 30, 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	$	83,639	$	33,820	$	49,819	$	62,008	$	27,086	$	34,922
Customer relationship intangibles	1,177		925		252		1,177		896		281
Mortgage servicing rights	42,616		12,445		30,171		42,139		18,891		23,248
Commercial servicing rights	6,800		4,932		1,868		6,719		4,110		2,609
Total	$	134,232	$	52,122	$	82,110	$	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 Intangibles		Mortgage Servicing Rights		Commercial Servicing Rights		Total
Three months ending December 31, 2018	$	2,583	$	10	$	1,642	$	139	$	4,374
Year ending December 31,
2019	9,452		38		7,132		485		17,107
2020	8,230		37		6,113		379		14,759
2021	7,036		35		5,094		331		12,496
2022	5,634		34		4,076		270		10,014
2023	4,933		34		3,057		154		8,178
Thereafter	11,951		64		3,057		110		15,182
Total	$	49,819	$	252	$	30,171	$	1,868	$	82,110

Summary of Changes in Servicing Rights

The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the nine months ended September 30, 2018, and September 30, 2017:

	2018			2017
Balance at January 1,	$	23,248		$	32,088
Originations	4,322			5,778
Amortization	(4,394		)	(7,184		)
Valuation allowance on mortgage servicing rights	—			—
Sale of mortgage servicing rights	—			(6,940		)
Acquired mortgage servicing rights	6,995			—
Balance at period end	$	30,171		$	23,742
Fair value of mortgage servicing rights	$	47,581		$	35,002
Mortgage servicing rights, net to servicing portfolio	0.73		%	0.67		%

The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the nine-months ended September 30, 2018, and September 30, 2017:

	2018			2017
Balance at January 1,	$	2,609		$	3,690
Originations	82			215
Amortization	(835		)	(1,077		)
Valuation allowance on commercial servicing rights	12			29
Balance at period end	$	1,868		$	2,857
Fair value of commercial servicing rights	$	2,529		$	3,458
Commercial servicing rights, net to servicing portfolio	1.63		%	1.98		%

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 September 30, 2018, and December 31, 2017:

September 30, 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	$	2,371	$	4,747	$	—	$	20,632	$	35,610	$	—
First Bank & Trust	1,685		1,741		—		5,483		5,483		—
Total	$	4,056	$	6,488	$	—	$	26,115	$	41,093	$	—
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 September 30, 2018, and December 31, 2017:

September 30, 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
Citywide Banks	$	2	$	6	$	—	$	30	$	33	$	—
Premier Valley Bank	53		82		—		188		203		—
Wisconsin Bank & Trust	260		519		—		1,335		1,686		—
Total	$	315	$	607	$	—	$	1,553	$	1,922	$	—
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