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Transfers and Servicing of Financial Assets (Including Mortgage Banking Activity) (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Balance at beginning of period
$
134,916

 
$
157,041

 
$
166,247

Originations and purchases
1,469,847

 
1,844,358

 
2,460,033

Sales, net of gains
(1,498,386
)
 
(1,859,565
)
 
(2,451,459
)
Mortgage loans transferred from (transferred to) held for investment
1,058

 
(6,918
)
 
(14,017
)
Other
299

 
—

 
(3,763
)
Balance at end of period
$
107,734

 
$
134,916

 
$
157,041
Components of Mortgage Income
The following table details the components of mortgage income for the years ended December 31:
(Dollars in thousands)
2018
 
2017
 
2016
Fair value changes of derivatives and mortgage loans held for sale:
 
 
 
 
 
Mortgage loans held for sale and derivatives
$
6,490

 
$
(7,047
)
 
$
1,361

Derivative settlements, net
(4,039
)
 
1,229

 
(6,640
)
Gains on sales
42,887

 
68,255

 
87,925

Servicing and other income, net
1,339

 
1,133

 
1,207

Other losses
(253
)
 
—

 
—

 
$
46,424

 
$
63,570

 
$
83,853
Schedule of Mortgage Servicing Rights at Carrying Value
Mortgage servicing rights had the following carrying values as of the periods indicated:
 
December 31, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(Dollars in thousands)
 
 
 
 
 
Mortgage servicing rights
$
13,612

 
$
(4,806
)
 
$
8,806

 
$
9,588

 
$
(3,931
)
 
$
5,657