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Mortgage servicing rights (Tables)
 12 Months Ended
Dec. 31, 2018
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 years ended December 31, 2018, 2017 and 2016:
 
 
Year Ended December 31,
 
 
 
2018

 
2017

 
2016

Carrying value prior to policy change
 
$
76,107

 
$
32,070

 
$
29,711

Fair value impact of change in accounting policy (See Note 1)
 
—

 
1,011

 
—

Carrying value at beginning of period
 
76,107

 
33,081

 
29,711

Capitalization
 
54,913

 
58,984

 
46,070

Amortization
 
—

 
—

 
(8,321
)
Sales
 
(39,428
)
 
(11,686
)
 
(34,118
)
(Loss) gain on sale
 
—

 
(249
)
 
3,406

Impairment
 
—

 
—

 
(4,678
)
Change in fair value:
 
 
 
 
 
 
Due to pay-offs/pay-downs
 
(11,062
)
 
(3,104
)
 
—

Due to change in valuation inputs or assumptions
 
8,299

 
(919
)
 
—

Carrying value at December 31
 
$
88,829

 
$
76,107

 
$
32,070
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 years ended December 31, 2018, 2017 and 2016, respectively: 
 
 
Year Ended December 31,
 
 
 
2018

 
2017

 
2016

Servicing income:
 
 
 
 
 
 
Servicing income
 
$
20,591

 
$
13,168

 
$
12,063

Change in fair value of mortgage servicing rights
 
(2,763
)
 
(4,023
)
 
—

Change in fair value of derivative hedging instruments
 
(5,910
)
 
599

 
—

Total servicing income
 
11,918

 
9,744

 
12,063

Servicing expenses:
 
 
 
 
 
 
Servicing asset amortization
 
—

 
—

 
8,321

Servicing asset impairment
 
—

 
—

 
4,678

Loss on sale of mortgage servicing rights, related hedges and
    transaction costs on sale
 
—

 
249

 
4,447

Other servicing expenses
 
7,675

 
4,896

 
2,325

Total servicing expenses
 
7,675

 
5,145

 
19,771

Net servicing income (loss)
 
$
4,243

 
$
4,599

 
$
(7,708
)
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 December 31, 2018 and 2017 are as follows: 
 
 
As of December 31,
 
 
 
2018


2017

Unpaid principal balance
 
$
6,755,114

 
$
6,529,431

Weighted-average prepayment speed (CPR)
 
8.58
%
 
8.90
%
Estimated impact on fair value of a 10% increase
 
(2,072
)
 
(3,026
)
Estimated impact on fair value of a 20% increase
 
(4,006
)
 
(5,855
)
Discount rate
 
10.45
%
 
9.75
%
Estimated impact on fair value of a 100 bp increase
 
(2,505
)
 
(3,052
)
Estimated impact on fair value of a 200 bp increase
 
(4,807
)
 
(5,867
)
Weighted-average coupon interest rate
 
4.21
%
 
3.94
%
Weighted-average servicing fee (basis points)
 
30


28

Weighted-average remaining maturity (in months)
 
325

 
335