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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of core deposit intangibles and other intangibles
For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.
 
2015
 
2014
 
2013
 
($ in Thousands)
Core deposit intangibles:
 
 
 
 
 
Gross carrying amount
$
19,545

 
$
36,230

 
$
36,230

Accumulated amortization
(19,152
)
 
(34,433
)
 
(31,565
)
Net book value
$
393

 
$
1,797

 
$
4,665

Amortization during the year
$
1,404

 
$
2,868

 
$
3,122

Other intangibles:
 
 
 
 
 
Gross carrying amount
$
31,398

 
$
19,283

 
$
19,283

Accumulated amortization
(15,333
)
 
(13,643
)
 
(12,764
)
Net book value
$
16,065

 
$
5,640

 
$
6,519

Additions during the period
$
12,115

 
$
—

 
$
—

Amortization during the year
$
1,690

 
$
879

 
$
921
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance
A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.
 
2015
 
2014
 
2013
 
($ in Thousands)
Mortgage servicing rights
 
 
Mortgage servicing rights at beginning of year
$
61,379

 
$
64,193

 
$
61,425

Additions
12,372

 
8,253

 
18,256

Amortization
(11,601
)
 
(11,067
)
 
(15,488
)
Mortgage servicing rights at end of year
$
62,150

 
$
61,379

 
$
64,193

Valuation allowance at beginning of year
(1,234
)
 
(913
)
 
(15,476
)
(Additions) recoveries, net
425

 
(321
)
 
14,563

Valuation allowance at end of year
(809
)
 
(1,234
)
 
(913
)
Mortgage servicing rights, net
$
61,341

 
$
60,145

 
$
63,280

Fair value of mortgage servicing rights
$
70,686

 
$
66,342

 
$
74,444

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
7,915,224

 
$
7,999,294

 
$
8,084,000

Mortgage servicing rights, net to servicing portfolio
0.77
%
 
0.75
%
 
0.78
%
Mortgage servicing rights expense (1)
$
11,176

 
$
11,388

 
$
925


(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
The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2015. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.
Estimated Amortization Expense
Core Deposit Intangibles
 
Other Intangibles
 
Mortgage Servicing Rights
 
($ in Thousands)
Year ending December 31,
 
 
 
 
 
2016
$
281

 
$
1,735

 
$
10,109

2017
112

 
1,702

 
8,415

2018
—

 
1,672

 
7,010

2019
—

 
1,373

 
5,894

2020
—

 
1,256

 
4,978

Beyond 2020
—

 
8,327

 
25,744

Total Estimated Amortization Expense
$
393

 
$
16,065

 
$
62,150