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Mortgage servicing rights (Tables)
 9 Months Ended
Sep. 30, 2019
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of Changes in Mortgage Servicing Rights
Changes in the Company’s mortgage servicing rights were as follows for three and nine months ended September 30, 2019 and 2018:
 
 
Three Months Ended September 30,
 
 
Nine Months Ended September 30,
 
 
 
2019

 
2018

 
2019

 
2018

Carrying value at beginning of period
 
$
66,380

 
$
109,449

 
$
88,829

 
$
76,107

Capitalization
 
10,387

 
11,741

 
30,319

 
41,555

Sales
 
—

 
(39,428
)
 
(29,160
)
 
(39,428
)
Change in fair value:
 
 
 
 
 
 
 
 
Due to pay-offs/pay-downs
 
(5,050
)
 
(3,339
)
 
(10,150
)
 
(8,606
)
Due to change in valuation inputs or assumptions
 
(5,561
)
 
1,467

 
(13,682
)
 
10,262

Carrying value at period end
 
$
66,156

 
$
79,890

 
$
66,156

 
$
79,890
Schedule of Servicing Income and Expense Included in Mortgage Banking Income
The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the three and nine months ended September 30, 2019 and 2018, respectively: 
 
 
Three Months Ended September 30,
 
 
Nine Months Ended September 30,
 
 
 
2019

 
2018

 
2019

 
2018

Servicing income:
 
 
 
 
 
 
 
 
Servicing income
 
$
3,960

 
$
5,576

 
$
12,763

 
$
15,973

Change in fair value of mortgage servicing rights
 
(10,611
)
 
(1,872
)
 
(23,832
)
 
1,656

Change in fair value of derivative hedging instruments
 
5,520

 
(829
)
 
13,060

 
(7,848
)
Servicing income
 
(1,131
)
 
2,875

 
1,991

 
9,781

Servicing expenses
 
1,732

 
2,114

 
4,961

 
5,987

Net servicing (loss) income(1)
 
$
(2,863
)
 
$
761

 
$
(2,970
)
 
$
3,794


(1) - Excludes benefit of custodial service related noninterest bearing deposits held by the Bank.
Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights
Data and key economic assumptions related to the Company’s mortgage servicing rights as of September 30, 2019 and December 31, 2018 are as follows: 
 
 
September 30,

 
December 31,

 
 
2019


2018

Unpaid principal balance
 
$
6,297,723

 
$
6,755,114

Weighted-average prepayment speed (CPR)
 
11.64
%
 
8.58
%
Estimated impact on fair value of a 10% increase
 
$
(2,743
)
 
$
(2,072
)
Estimated impact on fair value of a 20% increase
 
$
(5,278
)
 
$
(4,006
)
Discount rate
 
8.58
%
 
10.45
%
Estimated impact on fair value of a 100 bp increase
 
$
(2,568
)
 
$
(2,505
)
Estimated impact on fair value of a 200 bp increase
 
$
(4,946
)
 
$
(4,807
)
Weighted-average coupon interest rate
 
4.32
%
 
4.21
%
Weighted-average servicing fee (basis points)
 
29

 
30

Weighted-average remaining maturity (in months)
 
336

 
325