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Mortgage Servicing Rights ("MSRs") (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]  
Schedule of Servicing Assets at Fair Value
The following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the periods indicated:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
June 30,
 
June 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Balance at beginning of the period
 
$
54,572

 
$
21,596

 
$
33,676

 
$
19,103

Additions from loans sold with servicing retained
 
7,889

 
5,448

 
12,048

 
8,214

Additions from acquisitions
 
—

 
—

 
13,806

 
—

Estimate of changes in fair value due to:
 
 
 
 
 
 
 
 
Payoffs and paydowns
 
(1,364
)
 
(562
)
 
(2,566
)
 
(991
)
Changes in valuation inputs or assumptions
 
2,097

 
825

 
6,230

 
981

Fair value at end of the period
 
$
63,194

 
$
27,307

 
$
63,194

 
$
27,307

Unpaid principal balance of mortgage loans serviced for others
 
$
5,228,699

 
$
2,303,435