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Loan Servicing Rights (Tables)
 6 Months Ended
Jun. 30, 2019
Transfers and Servicing [Abstract]  
Schedule of activity for loan servicing rights and the related fair value changes The following table represents the activity for LSRs and the related fair value changes:
(Dollars in thousands)
 
Commercial
Real Estate
 
Mortgage
 
Total
For the three months ended June 30, 2019
 
 
 
 
 
 
Fair value, beginning of period
 
$
559

 
$
64,142

 
$
64,701

Additions from loans sold with servicing retained
 
—

 
2,109

 
2,109

Changes in fair value due to:
 
 
 
 
 
 
Reductions from pay-offs, pay downs and run-off
 
(34
)
 
(661
)
 
(695
)
Changes in estimates of fair value (1)
 
—

 
(5,457
)
 
(5,457
)
Fair value, end of period
 
$
525

 
$
60,133

 
$
60,658

For the six months ended June 30, 2019
 
 
 
 
 
 
Fair value, beginning of period
 
$
451

 
$
70,562

 
$
71,013

Additions from loans sold with servicing retained
 
138

 
4,104

 
4,242

Changes in fair value due to:
 
0

 
0

 
 
Reductions from pay-offs, pay downs and run-off
 
(64
)
 
(1,430
)
 
(1,494
)
Changes in estimates of fair value (1)
 
—

 
(13,103
)
 
(13,103
)
Fair value, end of period
 
$
525

 
$
60,133

 
$
60,658

Principal balance of loans serviced
 
$
43,657

 
$
6,731,556

 
$
6,775,213

For the three months ended June 30, 2018
 
 
 
 
 
 
Fair value, beginning of period
 
$
441

 
$
68,396

 
$
68,837

Additions from loans sold with servicing retained
 
45

 
2,239

 
2,284

Changes in fair value due to:
 
 
 
 
 
0

Reductions from pay-offs, pay downs and run-off
 
(29
)
 
(698
)
 
(727
)
Changes in estimates of fair value(1)
 
—

 
(30
)
 
(30
)
Fair value, end of period
 
$
457

 
$
69,907

 
$
70,364

For the six months ended June 30, 2018
 
 
 
 
 
 
Fair value, beginning of period
 
$
427

 
$
63,414

 
$
63,841

Additions from loans sold with servicing retained
 
88

 
4,163

 
4,251

Changes in fair value due to:
 
 
 
 
 
 
Reductions from pay-offs, pay downs and run-off
 
(58
)
 
(1,392
)
 
(1,450
)
Change in estimates of fair value(1)
 
—

 
3,722

 
3,722

Fair value, end of period
 
$
457

 
$
69,907

 
$
70,364

Principal balance of loans serviced
 
$
42,490

 
$
6,946,356

 
$
6,988,846

(1) 
Represents estimated LSR value change resulting primarily from market-driven changes in interest rates and prepayments. Included in "Net gain on sale of loans and other mortgage banking revenue" in the Consolidated Statements of Income.
Schedule of assumptions included in loan servicing rights The following table presents assumptions utilized in determining the fair value of loan servicing rights as of June 30, 2019 and December 31, 2018.
 
 
Mortgage
As of June 30, 2019
 
 

Prepayment speed
 
6.0 - 29.72

Weighted average ("WA") discount rate
 
10.1
%
WA cost to service/per year
 
$
66

WA ancillary income/per year
 
$
31

WA float range
 
2.4
%
As of December 31, 2018
 
 

Prepayment speed
 
0.0 - 26.4%

WA discount rate
 
10.1
%
WA cost to service/per year
 
$
66

WA ancillary income/per year
 
$
31

WA float range
 
2.5
%