Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Other Intangible Assets [Abstract]

Summary of core deposit intangibles and other intangibles

		2014		2013		2012
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	36,230	$	36,230	$	41,831
Accumulated amortization		(34,433)		(31,565)		(34,044)
Net book value	$	1,797	$	4,665	$	7,787
Amortization during the year	$	2,868	$	3,122	$	3,229
Other intangibles:
Gross carrying amount	$	19,283	$	19,283	$	19,283
Accumulated amortization		(13,643)		(12,764)		(11,843)
Net book value	$	5,640	$	6,519	$	7,440
Amortization during the year	$	879	$	921	$	966

Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance

		2014			2013				2012
		($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of year		$	64,193		$	61,425		$	75,855
	Additions		8,253			18,256			23,528
	Amortization		(11,067)			(15,488)			(23,348)
	Other-than-temporary impairment		―			―			(14,610)
Mortgage servicing rights at end of year		$	61,379		$	64,193		$	61,425
Valuation allowance at beginning of year			(913)			(15,476)			(27,703)
	(Additions) recoveries, net		(321)			14,563			(2,383)
	Other-than-temporary impairment		―			―			14,610
Valuation allowance at end of year			(1,234)			(913)			(15,476)
Mortgage servicing rights, net		$	60,145		$	63,280		$	45,949
Fair value of mortgage servicing rights		$	66,342		$	74,444		$	45,949
Portfolio of residential mortgage loans serviced for others
	("servicing portfolio")	$	7,999,294		$	8,084,000		$	7,453,000
Mortgage servicing rights, net to servicing portfolio			0.75	%		0.78	%		0.62	%
Mortgage servicing rights expense(1)		$	11,388		$	925		$	25,731

Summary of estimated future amortization expense

Estimated Amortization Expense	Core Deposit		Other			Mortgage Servicing
	Intangibles		Intangibles			Rights
Year ending December 31,		($ in Thousands)
2015	$	1,404	$	839	$	10,733
2016		281		803		8,787
2017		112		770		7,184
2018		―		740		5,895
2019		―		441		4,860
Beyond 2019		―		2,047		23,920
Total Estimated Amortization Expense	$	1,797	$	5,640	$	61,379