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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 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.
 
Nine Months Ended
September 30, 2016
 
Year Ended
December 31, 2015
 
($ in Thousands)
Core deposit intangibles:
 
 
 
Gross carrying amount
$
4,385

 
$
19,545

Accumulated amortization
(4,203
)
 
(19,152
)
Net book value
$
182

 
$
393

Amortization during the year
$
211

 
$
1,404

Other intangibles:
 
 
 
Gross carrying amount
$
32,410

 
$
31,398

Accumulated amortization
(16,690
)
 
(15,333
)
Net book value
$
15,720

 
$
16,065

Additions during the period
$
1,012

 
$
12,115

Amortization during the year
$
1,357

 
$
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.
 
Nine Months Ended
September 30, 2016
 
Year Ended
December 31, 2015
 
($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period
$
62,150

 
$
61,379

Additions
8,701

 
12,372

Amortization
(9,142
)
 
(11,601
)
Mortgage servicing rights at end of period
$
61,709

 
$
62,150

Valuation allowance at beginning of period
(809
)
 
(1,234
)
(Additions) recoveries, net
(2,486
)
 
425

Valuation allowance at end of period
(3,295
)
 
(809
)
Mortgage servicing rights, net
$
58,414

 
$
61,341

Fair value of mortgage servicing rights
$
58,937

 
$
70,686

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
8,010,973

 
$
7,915,224

Mortgage servicing rights, net to servicing portfolio
0.73
%
 
0.77
%
Mortgage servicing rights expense (1)
$
11,628

 
$
11,176


(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 September 30, 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)
Three months ending December 31, 2016
$
70

 
$
455

 
$
3,263

2017
112

 
1,786

 
11,237

2018
—

 
1,756

 
8,956

2019
—

 
1,457

 
7,223

2020
—

 
1,340

 
5,858

2021
—

 
1,316

 
4,784

Beyond 2021
—

 
7,610

 
20,388

Total Estimated Amortization Expense
$
182

 
$
15,720

 
$
61,709