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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 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.
 
Nine Months Ended September 30, 2017
 
Year Ended December 31, 2016
 
($ in Thousands)
Core deposit intangibles
 
 
 
Gross carrying amount
$
4,385

 
$
4,385

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

 
$
112

Amortization during the year
$
112

 
$
281

Other intangibles
 
 
 
Gross carrying amount
$
32,572

 
$
32,410

Accumulated amortization
(18,492
)
 
(17,145
)
Net book value
$
14,080

 
$
15,265

Additions during the period
$
162

 
$
1,012

Amortization during the year
$
1,347

 
$
1,812
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.
 
Nine Months Ended September 30, 2017
 
Year Ended December 31, 2016
 
($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period
$
62,085

 
$
62,150

Additions
4,822

 
12,262

Amortization
(7,635
)
 
(12,327
)
Mortgage servicing rights at end of period
$
59,272

 
$
62,085

Valuation allowance at beginning of period
(609
)
 
(809
)
(Additions) recoveries, net
(286
)
 
200

Valuation allowance at end of period
(895
)
 
(609
)
Mortgage servicing rights, net
$
58,377

 
$
61,476

Fair value of mortgage servicing rights
$
62,625

 
$
73,149

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
7,653,458

 
$
7,974,742

Mortgage servicing rights, net to servicing portfolio
0.76
%
 
0.77
%
Mortgage servicing rights expense (a)
$
7,921

 
$
12,127


(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 September 30, 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)
Three Months Ended December 31, 2017
$
451

 
$
2,593

2018
1,771

 
9,337

2019
1,472

 
7,792

2020
1,355

 
6,522

2021
1,331

 
5,484

2022
1,308

 
4,641

Beyond 2022
6,392

 
22,903

Total Estimated Amortization Expense
$
14,080

 
$
59,272