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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of core deposit intangibles and other intangibles
 
Nine Months Ended
September 30, 2015
 
Year Ended December 31, 2014
 
($ in Thousands)
Core deposit intangibles:
 
 
 
Gross carrying amount
$
36,230

 
$
36,230

Accumulated amortization
(35,759
)
 
(34,433
)
Net book value
$
471

 
$
1,797

Amortization during the period
$
1,326

 
$
2,868

Other intangibles:
 
 
 
Gross carrying amount
$
31,398

 
$
19,283

Accumulated amortization
(14,891
)
 
(13,643
)
Net book value
$
16,507

 
$
5,640

Additions during the period
$
12,115

 
$
—

Amortization during the period
$
1,248

 
$
879
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
 
Nine Months Ended September 30, 2015
 
Year Ended December 31, 2014
 
($ in Thousands)
Mortgage servicing rights:
 
 
 
Mortgage servicing rights at beginning of period
$
61,379

 
$
64,193

Additions
9,853

 
8,253

Amortization
(8,902
)
 
(11,067
)
Mortgage servicing rights at end of period
$
62,330

 
$
61,379

Valuation allowance at beginning of period
(1,234
)
 
(913
)
(Additions) recoveries, net
306

 
(321
)
Valuation allowance at end of period
(928
)
 
(1,234
)
Mortgage servicing rights, net
$
61,402

 
$
60,145

Fair value of mortgage servicing rights
$
67,794

 
$
66,342

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
7,906,960

 
$
7,999,294

Mortgage servicing rights, net to servicing portfolio
0.78
%
 
0.75
%
Mortgage servicing rights expense (1)
$
8,596

 
$
11,388

(1)
Includes the amortization of mortgage servicing rights and additions/recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net, in the consolidated statements of income.
Summary of estimated future amortization expense
Estimated amortization expense:
Core Deposit
Intangibles
 
Other
Intangibles
 
Mortgage Servicing
Rights
 
($ in Thousands)
Three months ending December 31, 2015
$
78

 
$
442

 
$
2,869

Year ending December 31, 2016
281

 
1,735

 
10,147

Year ending December 31, 2017
112

 
1,702

 
8,341

Year ending December 31, 2018
—

 
1,672

 
6,919

Year ending December 31, 2019
—

 
1,373

 
5,781

Year ending December 31, 2020
—

 
1,256

 
4,842

Beyond 2020
—

 
8,327

 
23,431

Total Estimated Amortization Expense
$
471

 
$
16,507

 
$
62,330