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Residential Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2018
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 three and nine months ended September 30, 2018 and 2017: 
(in thousands) 
Three Months Ended
 
Nine Months Ended
 
September 30, 2018
 
September 30, 2017
 
September 30, 2018
 
September 30, 2017
Balance, beginning of period
$
166,217

 
$
141,832

 
$
153,151

 
$
142,973

Additions for new MSR capitalized
8,622

 
8,626

 
22,012

 
23,486

Changes in fair value:
 
 
 
 
 
 
 
 Due to changes in model inputs or assumptions (1)
933

 
(4,861
)
 
16,828

 
(13,040
)
 Other (2)
(734
)
 
(4,372
)
 
(16,953
)
 
(12,194
)
Balance, end of period
$
175,038

 
$
141,225

 
$
175,038

 
$
141,225

 
(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 September 30, 2018 and December 31, 2017 is as follows: 
(dollars in thousands)
September 30, 2018
 
December 31, 2017
Balance of loans serviced for others
$
15,810,455

 
$
15,336,597

MSR as a percentage of serviced loans
1.11
%
 
1.00
%
Key Assumptions Used In Measuring The Fair Value of MSR
Key assumptions used in measuring the fair value of MSR as of September 30, 2018 and December 31, 2017 were as follows: 
 
September 30, 2018
 
December 31, 2017
Constant prepayment rate
12.19
%
 
12.27
%
Discount rate
9.70
%
 
9.70
%
Weighted average life (years)
6.4

 
6.3
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 September 30, 2018 and December 31, 2017 is as follows:
(in thousands)
September 30, 2018
 
December 31, 2017
Constant prepayment rate
 
 
 
Effect on fair value of a 10% adverse change
$
(7,036
)
 
$
(6,290
)
Effect on fair value of a 20% adverse change
$
(13,527
)
 
$
(12,093
)
 
 
 
 
Discount rate
 
 
 
Effect on fair value of a 100 basis point adverse change
$
(6,836
)
 
$
(5,840
)
Effect on fair value of a 200 basis point adverse change
$
(13,156
)
 
$
(11,249
)