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

 
$
36,230

Accumulated amortization
(34,875
)
 
(34,433
)
Net book value
$
1,355

 
$
1,797

Amortization during the period
$
442

 
$
2,868

Other intangibles:
 
 
 
Gross carrying amount
$
30,898

 
$
19,283

Accumulated amortization
(14,002
)
 
(13,643
)
Net book value
$
16,896

 
$
5,640

Additions during the period
$
11,615

 
$
—

Amortization during the period
$
359

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

 
$
64,193

Additions
3,010

 
8,253

Amortization
(3,179
)
 
(11,067
)
Mortgage servicing rights at end of period
$
61,210

 
$
61,379

Valuation allowance at beginning of period
(1,234
)
 
(913
)
Additions, net
(243
)
 
(321
)
Valuation allowance at end of period
(1,477
)
 
(1,234
)
Mortgage servicing rights, net
$
59,733

 
$
60,145

Fair value of mortgage servicing rights
$
64,026

 
$
66,342

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
7,919,711

 
7,999,294

Mortgage servicing rights, net to servicing portfolio
0.75
%
 
0.75
%
Mortgage servicing rights expense (1)
$
3,422

 
$
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)
Nine months ending December 31, 2015
$
962

 
$
1,299

 
$
8,643

Year ending December 31, 2016
281

 
1,696

 
9,596

Year ending December 31, 2017
112

 
1,663

 
7,778

Year ending December 31, 2018
—

 
1,633

 
6,338

Year ending December 31, 2019
—

 
1,334

 
5,195

Year ending December 31, 2020
—

 
1,218

 
4,276

Beyond 2020
—

 
8,053

 
19,384

Total Estimated Amortization Expense
$
1,355

 
$
16,896

 
$
61,210