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Mortgage Servicing Rights ("MSRs") (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
September 30,
 
September 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Balance at beginning of the period
 
$
63,194

 
$
27,307

 
$
33,676

 
$
19,103

Additions from loans sold with servicing retained
 
11,340

 
4,948

 
23,388

 
13,162

Additions from acquisitions
 
—

 
—

 
13,806

 
—

Estimate of changes in fair value due to:
 
 
 
 
 
 
 
 
Payoffs and paydowns
 
(1,081
)
 
(641
)
 
(3,647
)
 
(1,632
)
Changes in valuation inputs or assumptions
 
1,077

 
(2,200
)
 
7,307

 
(1,219
)
Fair value at end of the period
 
$
74,530

 
$
29,414

 
$
74,530

 
$
29,414

Unpaid principal balance of mortgage loans serviced for others
 
$
5,904,300

 
$
2,622,411