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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
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.
 
2016
 
2015
 
2014
 
($ in Thousands)
Core deposit intangibles:
 
 
 
 
 
Gross carrying amount
$
4,385

 
$
19,545

 
$
36,230

Accumulated amortization
(4,273
)
 
(19,152
)
 
(34,433
)
Net book value
$
112

 
$
393

 
$
1,797

Amortization during the year
$
281

 
$
1,404

 
$
2,868

Other intangibles:
 
 
 
 
 
Gross carrying amount
$
32,410

 
$
31,398

 
$
19,283

Accumulated amortization
(17,145
)
 
(15,333
)
 
(13,643
)
Net book value
$
15,265

 
$
16,065

 
$
5,640

Additions during the period
$
1,012

 
$
12,115

 
$
—

Amortization during the year
$
1,812

 
$
1,690

 
$
879
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.
 
2016
 
2015
 
2014
 
($ in Thousands)
Mortgage servicing rights
 
 
Mortgage servicing rights at beginning of year
$
62,150

 
$
61,379

 
$
64,193

Additions
12,262

 
12,372

 
8,253

Amortization
(12,327
)
 
(11,601
)
 
(11,067
)
Mortgage servicing rights at end of year
$
62,085

 
$
62,150

 
$
61,379

Valuation allowance at beginning of year
(809
)
 
(1,234
)
 
(913
)
(Additions) recoveries, net
200

 
425

 
(321
)
Valuation allowance at end of year
(609
)
 
(809
)
 
(1,234
)
Mortgage servicing rights, net
$
61,476

 
$
61,341

 
$
60,145

Fair value of mortgage servicing rights
$
73,149

 
$
70,686

 
$
66,342

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
7,974,742

 
$
7,915,224

 
$
7,999,294

Mortgage servicing rights, net to servicing portfolio
0.77
%
 
0.77
%
 
0.75
%
Mortgage servicing rights expense (1)
$
12,127

 
$
11,176

 
$
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
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, 2016. 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,
 
 
 
 
 
2017
$
112

 
$
1,786

 
$
9,627

2018
—

 
1,756

 
8,134

2019
—

 
1,457

 
6,878

2020
—

 
1,340

 
5,840

2021
—

 
1,316

 
4,970

Beyond 2021
—

 
7,610

 
26,636

Total Estimated Amortization Expense
$
112

 
$
15,265

 
$
62,085