Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Other Intangible Assets [Abstract]

Summary of core deposit intangibles and other intangibles

	Nine Months Ended		Year Ended
	September 30, 2012		December 31, 2011
		($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	41,831	$	41,831
Accumulated amortization		(33,237)		(30,815)
Net book value	$	8,594	$	11,016
Amortization during the period	$	2,422	$	3,695
Other intangibles:
Gross carrying amount	$	19,283	$	19,283
Accumulated amortization		(11,601)		(10,877)
Net book value	$	7,682	$	8,406
Amortization during the period	$	724	$	1,019

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

		Nine Months Ended			Year Ended
		September 30, 2012			December 31, 2011
			($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period		$	75,855		$	84,209
	Additions		18,669			17,476
	Amortization		(17,326)			(25,830)
	Other-than-temporary impairment		(14,610)			―
Mortgage servicing rights at end of period		$	62,588		$	75,855
Valuation allowance at beginning of period			(27,703)			(20,300)
	Additions, net		(4,477)			(7,403)
	Other-than-temporary impairment		14,610			―
Valuation allowance at end of period			(17,570)			(27,703)
Mortgage servicing rights, net		$	45,018		$	48,152
Fair value of mortgage servicing rights		$	45,018		$	48,152
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)			7,547,000			7,321,000
Mortgage servicing rights, net to servicing portfolio			0.60	%		0.66	%
Mortgage servicing rights expense(1)		$	21,803		$	33,233

Summary of estimated future amortization expense

	Core Deposit		Other		Mortgage Servicing
Estimated amortization expense:	Intangibles		Intangibles		Rights
		($ in Thousands)
Three months ending December 31, 2012	$	800	$	200	$	4,500
Year ending December 31, 2013		3,100		900		14,200
Year ending December 31, 2014		2,900		900		10,200
Year ending December 31, 2015		1,400		800		7,700
Year ending December 31, 2016		300		800		5,900
Year ending December 31, 2017		100		800		4,500