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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill [Line Items]  
Changes in Goodwill
The following table presents the changes in the carrying amount of goodwill.
(Dollars in thousands)
2014
 
2013
Balance at January 1
$
102,625

 
$
102,625

Acquired in the 1st Financial merger
32,915

 
—

Acquired in the Bancorporation merger
4,233

 
—

Balance at December 31
$
139,773

 
$
102,625
Mortgage Servicing Rights Key Economic Assumptions Used to Value
Key economic assumptions used to value mortgage servicing rights as of December 31, 2014:
 
2014
Discount rate - conventional fixed loans
7.2
%
Discount rate - all loans excluding conventional fixed loans
9.2
%
Weighted average constant prepayment rate
14.25
%
Weighted average cost to service loans
$
56.02
Schedule of Mortgage Servicing Rights at Amortized Cost
The activity of the servicing asset for 2014 and 2013 is presented in the following table:
(Dollars in thousands)
2014
 
2013
Balance at January 1
$
16

 
$
1,784

Servicing rights originated
727

 
—

Amortization
(919
)
 
(205
)
Servicing rights acquired in the 1st Financial merger
148

 
—

Servicing rights acquired in the Bancorporation merger
17,566

 
—

Servicing assets sold
—

 
(1,563
)
Valuation allowance
$
(850
)
 
$
—

Balance at December 31
$
16,688

 
$
16
Schedule of Other Intangible Assets
The following information relates to other intangible assets, all customer-related, which are being amortized over their estimated useful lives:
(dollars in thousands)
2014
 
2013
Balance at January 1
$
1,247

 
$
3,556

Acquired in the 1st Financial merger
3,780

 
—

Acquired in the Bancorporation merger
91,850

 
—

Amortization
(6,955
)
 
(2,309
)
Balance at December 31
$
89,922

 
$
1,247

 
Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2014. BancShares recorded $88.0 million and $3.8 million in core deposit intangibles related to the Bancorporation and 1st Financial mergers, respectively. Intangible assets generated by acquisitions, which represent the estimated fair value of core deposits and other customer relationships that were acquired, are being amortized on an accelerated basis over their estimated useful lives. The estimated useful remaining lives range from less than 1 year to no more than 10 years.

The gross amount of other intangible assets and accumulated amortization as of December 31, 2014 and 2013, are:
(dollars in thousands)
2014
 
2013
Gross balance
$
114,596

 
$
18,966

Accumulated amortization
(24,674
)
 
(17,719
)
Carrying value
$
89,922

 
$
1,247
Future Amortization Expense Schedule
Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be:
(dollars in thousands)
 
2015
$
18,576

2016
16,200

2017
13,951

2018
11,701

2019
9,457