Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2013

Goodwill and Other Intangible Assets [Abstract]

Summary of core deposit intangibles and other intangibles

	Three Months Ended		Year Ended
	March 31, 2013		December 31, 2012
		($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	41,831	$	41,831
Accumulated amortization		(34,824)		(34,044)
Net book value	$	7,007	$	7,787
Amortization during the period	$	780	$	3,229
Other intangibles:
Gross carrying amount	$	19,283	$	19,283
Accumulated amortization		(12,074)		(11,843)
Net book value	$	7,209	$	7,440
Amortization during the period	$	231	$	966

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

		Three Months Ended			Year Ended
		March 31, 2013			December 31, 2012
			($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period		$	61,425		$	75,855
	Additions		5,902			23,528
	Amortization		(4,989)			(23,348)
	Other-than-temporary impairment		―			(14,610)
Mortgage servicing rights at end of period		$	62,338		$	61,425
Valuation allowance at beginning of period			(15,476)			(27,703)
	(Additions) / Recoveries, net		5,216			(2,383)
	Other-than-temporary impairment		―			14,610
Valuation allowance at end of period			(10,260)			(15,476)
Mortgage servicing rights, net		$	52,078		$	45,949
Fair value of mortgage servicing rights		$	52,078		$	45,949
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)			7,585,000			7,453,000
Mortgage servicing rights, net to servicing portfolio			0.69	%		0.62	%
Mortgage servicing rights expense(1)		$	(227)		$	25,731

Summary of estimated future amortization expense

	Core Deposit		Other		Mortgage Servicing
Estimated amortization expense:	Intangibles		Intangibles		Rights
		($ in Thousands)
Nine months ending December 31, 2013	$	2,300	$	700	$	10,300
Year ending December 31, 2014		2,900		900		10,900
Year ending December 31, 2015		1,400		800		8,400
Year ending December 31, 2016		300		800		6,600
Year ending December 31, 2017		100		800		5,300
Year ending December 31, 2018		―		700		4,200