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Mortgage servicing rights (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018:
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2019

 
2018

 
2019

 
2018

Carrying value at beginning of period
 
$
64,031

 
$
93,160

 
$
88,829

 
$
76,107

Capitalization
 
11,212

 
16,304

 
19,932

 
29,814

Sales
 
—

 
—

 
(29,160
)
 
—

Change in fair value:
 
 
 
 
 
 
 
 
Due to pay-offs/pay-downs
 
(3,305
)
 
(2,207
)
 
(5,100
)
 
(5,267
)
Due to change in valuation inputs or assumptions
 
(5,558
)
 
2,192

 
(8,121
)
 
8,795

Carrying value at period end
 
$
66,380

 
$
109,449

 
$
66,380

 
$
109,449
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 six months ended June 30, 2019 and 2018, respectively: 
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2019

 
2018

 
2019

 
2018

Servicing income:
 
 
 
 
 
 
 
 
Servicing income
 
$
4,052

 
$
5,604

 
$
8,803

 
$
10,397

Change in fair value of mortgage servicing rights
 
(8,863
)
 
(15
)
 
(13,221
)
 
3,528

Change in fair value of derivative hedging instruments
 
5,063

 
(1,763
)
 
7,540

 
(7,019
)
Servicing income
 
252

 
3,826

 
3,122

 
6,906

Servicing expenses
 
1,485

 
2,078

 
3,229

 
3,873

Net servicing (loss) income
 
$
(1,233
)
 
$
1,748

 
$
(107
)
 
$
3,033
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 June 30, 2019 and December 31, 2018 are as follows: 
 
 
June 30,

 
December 31,

 
 
2019


2018

Unpaid principal balance
 
$
5,850,557

 
$
6,755,114

Weighted-average prepayment speed (CPR)
 
11.37
%
 
8.58
%
Estimated impact on fair value of a 10% increase
 
$
(2,881
)
 
$
(2,072
)
Estimated impact on fair value of a 20% increase
 
$
(5,546
)
 
$
(4,006
)
Discount rate
 
9.24
%
 
10.45
%
Estimated impact on fair value of a 100 bp increase
 
$
(2,656
)
 
$
(2,505
)
Estimated impact on fair value of a 200 bp increase
 
$
(5,102
)
 
$
(4,807
)
Weighted-average coupon interest rate
 
4.40
%
 
4.21
%
Weighted-average servicing fee (basis points)
 
29

 
30

Weighted-average remaining maturity (in months)
 
318

 
325