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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS (Tables)
9 Months Ended
Sep. 30, 2018
Transfers and Servicing [Abstract]  
Changes in Servicing Assets
The changes in servicing assets are shown below:
Quarter EndedNine-Month Period Ended
September 30, September 30,
(In thousands)2018201720182017
Balance at beginning of period$27,191$26,502$25,255$26,244
Capitalization of servicing assets1,0038333,0282,757
Amortization(722)(775)(2,188)(2,342)
Adjustment to fair value(65)(690)1,265(1,047)
Other (1)186129233387
Balance at end of period$27,593$25,999$27,593$25,999
(1)Amount represents the adjustment to fair value related to the repurchase of loans serviced for others.
Changes in Impairment Allowance
Changes in the impairment allowance were as follows:
Quarter EndedNine-Month Period Ended
September 30, September 30,
2018201720182017
(In thousands)
Balance at beginning of period$56$197$1,451$461
Temporary impairment charges656901021,047
OTTI of servicing assets--(65)(621)
Recoveries--(1,367)-
Balance at end of period$121$887$121$887
Components of Net Servicing Income
The components of net servicing income are shown below:
Quarter EndedNine-Month Period Ended
September 30, September 30,
2018201720182017
(In thousands)
Servicing fees$2,084$1,898$6,262$5,897
Late charges and prepayment penalties114103380340
Adjustment for loans repurchased186129233387
Other (8)-(8)(35)
Servicing income, gross2,3762,1306,8676,589
Amortization and impairment of servicing assets(787)(1,464)(923)(3,389)
Servicing income, net$1,589$666$5,944$3,200
Key Economic Assumptions Used in Determining Fair Value at Time of Sale of Loans
The Corporation’s servicing assets are subject to prepayment and interest rate risks. Key economic assumptions used in determining the fair value at the time of sale of the related mortgages ranged as follows:
MaximumMinimum
Nine-Month Period Ended September 30, 2018:
Constant prepayment rate:
Government-guaranteed mortgage loans5.9%5.6%
Conventional conforming mortgage loans6.4%6.2%
Conventional non-conforming mortgage loans9.8%9.1%
Discount rate:
Government-guaranteed mortgage loans12.0%12.0%
Conventional conforming mortgage loans10.0%10.0%
Conventional non-conforming mortgage loans14.3%14.3%
Nine-Month Period Ended September 30, 2017:
Constant prepayment rate:
Government-guaranteed mortgage loans6.2%6.0%
Conventional conforming mortgage loans6.7%6.3%
Conventional non-conforming mortgage loans9.5%9.1%
Discount rate:
Government-guaranteed mortgage loans12.0%12.0%
Conventional conforming mortgage loans10.0%10.0%
Conventional non-conforming mortgage loans14.3%14.3%
Weighted-Averages of Key Economic Assumptions in Valuation Model

The weighted averages of the key economic assumptions that the Corporation used in its valuation model and the sensitivity of the current fair value to immediate 10% and 20% adverse changes in those assumptions for mortgage loans as of September 30, 2018 were as follows:

(Dollars in thousands)
Carrying amount of servicing assets$27,593
Fair value$32,304
Weighted-average expected life (in years)8.45
Constant prepayment rate (weighted-average annual rate)6.14%
Decrease in fair value due to 10% adverse change$774
Decrease in fair value due to 20% adverse change$1,516
Discount rate (weighted-average annual rate)11.25%
Decrease in fair value due to 10% adverse change$1,613
Decrease in fair value due to 20% adverse change$3,088