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

12 Months Ended

Dec. 31, 2016

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, 2016, and December 31, 2015, are presented in the table below, in thousands:

	December 31, 2016						December 31, 2015
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizing intangible assets:
Core deposit intangibles	$	43,504	$	21,049	$	22,455	$	37,118	$	15,460	$	21,658
Mortgage servicing rights	50,467		18,379		32,088		45,744		15,430		30,314
Customer relationship intangible	1,177		857		320		1,177		815		362
Commercial servicing rights	6,504		2,814		3,690		5,685		1,074		4,611
Total	$	101,652	$	43,099	$	58,553	$	89,724	$	32,779	$	56,945

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		Mortgage Servicing Rights		Customer Relationship Intangible		Commercial Servicing Rights		Total
Year ending December 31,
2017	$	4,410	$	8,022	$	40	$	876	$	13,348
2018	3,904		6,876		39		810		11,629
2019	3,423		5,730		38		637		9,828
2020	2,981		4,584		36		474		8,075
2021	2,465		3,438		35		399		6,337
Thereafter	5,272		3,438		132		494		9,336
Total	$	22,455	$	32,088	$	320	$	3,690	$	58,553

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, 2016, and December 31, 2015:

	2016			2015
Balance at January 1,	$	4,611		$	—
Originations	628			815
Amortization	(1,706		)	(1,075		)
Purchased commercial servicing rights	190			4,871
Valuation allowance on commercial servicing rights	(33		)	—
Balance at December 31,	$	3,690		$	4,611
Fair value of commercial servicing rights	$	4,127		$	4,902
Commercial servicing rights, net to servicing portfolio	2.24		%	2.48		%

The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the twelve months ended December 31, 2016, and December 31, 2015:

	2016			2015
Balance at January 1	$	30,314		$	24,984
Originations	12,266			13,930
Amortization	(10,492		)	(8,600		)
Balance at December 31	$	32,088		$	30,314
Fair value of mortgage servicing rights	$	45,210		$	40,880
Mortgage servicing rights, net to servicing portfolio	0.74		%	0.75		%

Schedule of Servicing Asset at Fair Value and Amortized Cost

	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, 2016
Centennial Bank and Trust	$	19	$	23	$	—	$	107	$	114	$	—
Premier Valley Bank	156		180		—		359		326		33
Wisconsin Bank & Trust	833		997		—		2,249		2,487		—
Total	$	1,008	$	1,200	$	—	$	2,715	$	2,927	$	33
December 31, 2015
Centennial Bank and Trust	$	—	$	—	$	—	$	—	$	—	$	—
Premier Valley Bank	189		200		—		417		432		—
Wisconsin Bank & Trust	1,048		1,097		—		2,957		3,173		—
Total	$	1,237	$	1,297	$	—	$	3,374	$	3,605	$	—