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Mortgage Servicing Rights ("MSRs") (Tables)
 3 Months Ended
Mar. 31, 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
 
 
March 31,
 
March 31,
(Dollars in thousands)
 
2018
 
2017
Balance at beginning of the period
 
$
33,676

 
$
19,103

Additions from loans sold with servicing retained
 
4,159

 
2,766

Additions from acquisitions
 
13,806

 
—

Estimate of changes in fair value due to:
 
 
 
 
Payoffs and paydowns
 
(1,202
)
 
(429
)
Changes in valuation inputs or assumptions
 
4,133

 
156

Fair value at end of the period
 
$
54,572

 
$
21,596

Unpaid principal balance of mortgage loans serviced for others
 
$
4,795,335

 
$
1,972,592