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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Changes in Carrying Amount of Mortgage Loans Held-for-sale
Changes to the carrying amount of mortgage loans held for sale at December 31 are presented in the following table.
(Dollars in thousands)
2017
 
2016
 
2015
Balance at beginning of period
$
157,041

 
$
166,247

 
$
140,072

Originations and purchases
1,844,358

 
2,460,033

 
2,464,588

Sales, net of gains
(1,859,565
)
 
(2,451,459
)
 
(2,432,979
)
Mortgage loans transferred to held for investment
(6,918
)
 
(14,017
)
 
—

Other
—

 
(3,763
)
 
(5,434
)
Balance at end of period
$
134,916

 
$
157,041

 
$
166,247
Components of Mortgage Income
The following table details the components of mortgage income for the years ended December 31:
(Dollars in thousands)
2017
 
2016
 
2015
Fair value changes of derivatives and mortgage loans held for sale:
 
 
 
 
 
Mortgage loans held for sale and derivatives
$
(7,047
)
 
$
1,361

 
$
2,216

Derivative settlements, net
1,229

 
(6,640
)
 
(5,017
)
Gains on sales
68,255

 
87,925

 
82,671

Servicing and other income, net
1,133

 
1,207

 
792

 
$
63,570

 
$
83,853

 
$
80,662
Schedule of Mortgage Servicing Rights at Carrying Value
Mortgage servicing rights had the following carrying values as of the periods indicated:
 
December 31, 2017
 
December 31, 2016
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(Dollars in thousands)
 
 
 
 
 
Mortgage servicing rights
$
9,588

 
$
(3,931
)
 
$
5,657

 
$
7,202

 
$
(3,144
)
 
$
4,058