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Mortgage Servicing Rights
3 Months Ended
Mar. 31, 2017
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights
Mortgage Servicing Rights
(In Thousands)
The Company retains the right to service certain mortgage loans that it sells to secondary market investors. These mortgage servicing rights (“MSRs”), included in “Other assets” on the Consolidated Balance Sheets, are recognized as a separate asset on the date the corresponding mortgage loan is sold. MSRs are amortized in proportion to and over the period of estimated net servicing income. These servicing rights are carried at the lower of amortized cost or fair market value. Fair market value is determined using an income approach with various assumptions including expected cash flows, prepayment speeds, market discount rates, servicing costs, and other factors. Impairment losses on MSRs are recognized to the extent by which the unamortized cost exceeds fair value. There were no impairment losses recognized during the three months ended March 31, 2017 or 2016.
During the first quarter of 2016, the Company sold MSRs relating to mortgage loans having an aggregate unpaid principal balance totaling $1,830,444 to a third party for net proceeds of $18,508. There were no sales of MSRs during the three months ended March 31, 2017.
Changes in the Company’s MSRs were as follows: 
Balance at January 1, 2017
$
26,302

Capitalization
3,276

Amortization
(802
)
Balance at March 31, 2017
$
28,776



Data and key economic assumptions related to the Company’s MSRs as of March 31, 2017 and December 31, 2016 are as follows:
 
 
March 31, 2017
 
December 31, 2016
Unpaid principal balance
$
3,045,228

 
$
2,763,344

 
 
 
 
Weighted-average prepayment speed (CPR)
7.28
%
 
7.34
%
Estimated impact of a 10% increase
$
(1,147
)
 
$
(1,034
)
Estimated impact of a 20% increase
(2,234
)
 
(2,010
)
 
 
 
 
Discount rate
9.65
%
 
9.64
%
Estimated impact of a 10% increase
$
(1,620
)
 
$
(1,368
)
Estimated impact of a 20% increase
(3,110
)
 
(2,629
)
 
 
 
 
Weighted-average coupon interest rate
3.82
%
 
3.83
%
Weighted-average servicing fee (basis points)
25.89

 
25.87

Weighted-average remaining maturity (in years)
12.49

 
11.11


As part of “Mortgage banking income” in the Consolidated Statements of Income, the Company recorded servicing fees of $1,233 and $1,296 for the three months ended March 31, 2017 and 2016, respectively.