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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
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.
 
Three Months Ended March 31, 2018
 
Year Ended December 31, 2017
 
($ in Thousands)
Core deposit intangibles
 
 
 
Gross carrying amount
$
58,100

 
$
4,385

Accumulated amortization
(968
)
 
(4,385
)
Net book value
$
57,132

 
$
—

Additions during the periods
$
58,100

 
$
—

Amortization during the year
$
968

 
$
112

Other intangibles
 
 
 
Gross carrying amount
$
42,131

 
$
34,572

Accumulated amortization
(19,549
)
 
(18,992
)
Net book value
$
22,582

 
$
15,580

Additions during the period
$
7,559

 
$
2,162

Amortization during the year
$
557

 
$
1,847
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.
 
Three Months Ended March 31, 2018
 
Year Ended December 31, 2017
 
($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period
$
59,168

 
$
62,085

Additions from acquisition
8,136

 
—

Additions
1,737

 
7,167

Amortization
(2,324
)
 
(10,084
)
Mortgage servicing rights at end of period
$
66,717

 
$
59,168

Valuation allowance at beginning of period
(784
)
 
(609
)
(Additions) recoveries, net
474

 
(175
)
Valuation allowance at end of period
(310
)
 
(784
)
Mortgage servicing rights, net
$
66,407

 
$
58,384

Fair value of mortgage servicing rights
$
81,810

 
$
64,387

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
8,507,294

 
$
7,646,846

Mortgage servicing rights, net to servicing portfolio
0.78
%
 
0.76
%
Mortgage servicing rights expense (a)
$
1,849

 
$
10,259


(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 March 31, 2018. 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)
Nine Months Ended December 31, 2018
$
4,358

 
$
2,045

 
$
7,115

2019
5,810

 
2,428

 
9,324

2020
5,810

 
2,311

 
8,078

2021
5,810

 
2,287

 
6,977

2022
5,810

 
2,263

 
6,035

2023
5,810

 
2,244

 
5,234

Beyond 2023
23,724

 
9,004

 
23,954

Total Estimated Amortization Expense
$
57,132

 
$
22,582

 
$
66,717