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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
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.
 
2017
 
2016
 
2015
 
($ in Thousands)
Core deposit intangibles
 
 
 
 
 
Gross carrying amount
$
4,385

 
$
4,385

 
$
19,545

Accumulated amortization
(4,385
)
 
(4,273
)
 
(19,152
)
Net book value
$
—

 
$
112

 
$
393

Amortization during the year
$
112

 
$
281

 
$
1,404

Other intangibles
 
 
 
 
 
Gross carrying amount
$
34,572

 
$
32,410

 
$
31,398

Accumulated amortization
(18,992
)
 
(17,145
)
 
(15,333
)
Net book value
$
15,580

 
$
15,265

 
$
16,065

Additions during the period
$
2,162

 
$
1,012

 
$
12,115

Amortization during the year
$
1,847

 
$
1,812

 
$
1,690
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.
 
2017
 
2016
 
2015
 
($ in Thousands)
Mortgage servicing rights
 
 
Mortgage servicing rights at beginning of year
$
62,085

 
$
62,150

 
$
61,379

Additions
7,167

 
12,262

 
12,372

Amortization
(10,084
)
 
(12,327
)
 
(11,601
)
Mortgage servicing rights at end of year
$
59,168

 
$
62,085

 
$
62,150

Valuation allowance at beginning of year
(609
)
 
(809
)
 
(1,234
)
(Additions) recoveries, net
(175
)
 
200

 
425

Valuation allowance at end of year
(784
)
 
(609
)
 
(809
)
Mortgage servicing rights, net
$
58,384

 
$
61,476

 
$
61,341

Fair value of mortgage servicing rights
$
64,387

 
$
73,149

 
$
70,686

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
7,646,846

 
$
7,974,742

 
$
7,915,224

Mortgage servicing rights, net to servicing portfolio
0.76
%
 
0.77
%
 
0.77
%
Mortgage servicing rights expense (a)
$
10,259

 
$
12,127

 
$
11,176


(a)
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, 2017. 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
Other Intangibles
 
Mortgage Servicing Rights
 
($ in Thousands)
Year ending December 31,
 
 
 
2018
$
1,971

 
$
9,590

2019
1,672

 
8,051

2020
1,555

 
6,747

2021
1,531

 
5,670

2022
1,508

 
4,783

Beyond 2022
7,343

 
24,327

Total Estimated Amortization Expense
$
15,580

 
$
59,168