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Residential Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2015
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"), which are carried at fair value, for the three and nine months ended September 30, 2015 and 2014: 
(in thousands) 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
Balance, beginning of period
$
127,206

 
$
114,192

 
$
117,259

 
$
47,765

Acquired/purchased MSR
—

 
—

 
—

 
62,770

Additions for new MSR capitalized
7,711

 
8,813

 
27,812

 
16,583

Changes in fair value:
 
 
 
 
 
 
 
 Due to changes in model inputs or assumptions(1)
(6,794
)
 
(672
)
 
(5,860
)
 
(2,543
)
 Other(2)
(3,309
)
 
(3,608
)
 
(14,397
)
 
(5,850
)
Balance, end of period
$
124,814

 
$
118,725

 
$
124,814

 
$
118,725

 
(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 residential mortgage serviced loan portfolio as of September 30, 2015 and December 31, 2014 is as follows: 
(dollars in thousands)
September 30, 2015
 
December 31, 2014
Balance of residential mortgage loans serviced for others
$
12,693,451

 
$
11,590,310

MSR as a percentage of serviced loans
0.98
%
 
1.01
%
Key Assumptions Used In Measuring The Fair Value of MSR
Key assumptions used in measuring the fair value of MSR as of September 30, 2015 and December 31, 2014 are as follows: 
 
September 30, 2015
 
December 31, 2014
Constant prepayment rate
13.69
%
 
12.39
%
Discount rate
9.19
%
 
9.17
%
Weighted average life (years)
5.9

 
6.4
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, 2015 and December 31, 2014 is as follows:
(in thousands)
September 30, 2015
 
December 31, 2014
Constant prepayment rate
 
 
 
Effect on fair value of a 10% adverse change
$
(5,466
)
 
$
(4,965
)
Effect on fair value of a 20% adverse change
$
(10,490
)
 
$
(9,547
)
 
 
 
 
Discount rate
 
 
 
Effect on fair value of a 100 basis point adverse change
$
(4,509
)
 
$
(4,539
)
Effect on fair value of a 200 basis point adverse change
$
(8,680
)
 
$
(8,771
)