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Residential Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Schedule Of Changes In Mortgage Servicing Rights
The following table presents the changes in the Company's residential mortgage servicing rights ("MSR") for the years ended December 31, 2017, 2016 and 2015: 

(in thousands) 
2017
 
2016
 
2015
Balance, beginning of period
$
142,973

 
$
131,817

 
$
117,259

Additions for new MSR capitalized
33,445

 
37,082

 
35,284

Changes in fair value:
 
 
 
 
 
 Due to changes in model inputs or assumptions (1)
(1,952
)
 
7,873

 
(380
)
 Other (2)
(21,315
)
 
(33,799
)
 
(20,346
)
Balance, end of period
$
153,151

 
$
142,973

 
$
131,817

 
(1) 
Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates. 
(2) 
Represents changes due to collection/realization of expected cash flows over time.
Schedule Of Other Information Servicing Loan Portfolio
Information related to our serviced loan portfolio as of December 31, 2017, 2016 and 2015 is as follows: 
(dollars in thousands)
December 31, 2017
 
December 31, 2016
 
December 31, 2015
Balance of loans serviced for others
$
15,336,597

 
$
14,327,368

 
$
13,047,266

MSR as a percentage of serviced loans
1.00
%
 
1.00
%
 
1.01
%
Key Assumptions Used In Measuring The Fair Value of MSR
Key assumptions used in measuring the fair value of MSR as of December 31 were as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
Constant prepayment rate
12.27
%
 
11.43
%
 
11.70
%
Discount rate
9.70
%
 
9.69
%
 
9.68
%
Weighted average life (years)
6.3

 
6.6

 
6.5
Sensitivity Analysis of Current Fair Value to Changes in Discount and Prepayment Speed Assumptions
A sensitivity analysis of the current fair value to changes in discount and prepayment speed assumptions as of December 31, 2017 and December 31, 2016 is as follows:
 
December 31, 2017
 
December 31, 2016
Constant prepayment rate
 
 
 
Effect on fair value of a 10% adverse change
$
(6,290
)
 
$
(6,075
)
Effect on fair value of a 20% adverse change
$
(12,093
)
 
$
(11,720
)
 
 
 
 
Discount rate
 
 
 
Effect on fair value of a 100 basis point adverse change
$
(5,840
)
 
$
(5,817
)
Effect on fair value of a 200 basis point adverse change
$
(11,249
)
 
$
(11,118
)