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Loan Sales and Servicing (Tables)
 3 Months Ended
Mar. 31, 2017
Transfers and Servicing [Abstract]  
Schedule of loans transferred to held for sale and loans sold
The following table summarizes the Company's activity in the loans held for sale portfolio and loan sales, excluding activity related to loans originated for sale in the secondary market.
 
Three Months Ended March 31,
 
2017
 
2016
 
(In Thousands)
Loans transferred from held for investment to held for sale
$
—

 
$
764,022

Charge-offs on loans recognized at transfer from held for investment to held for sale
—

 
—

Loans and loans held for sale sold
128,842

 
760,297
Schedule of loan sales and residential mortgage servicing rights
The following table is an analysis of the activity in the Company’s MSRs.
 
Three Months Ended March 31,
 
2017
 
2016
 
(In Thousands)
Carrying value, at beginning of period
$
51,428

 
$
44,541

Additions
2,018

 
4,407

Increase (decrease) in fair value:
 
 
 
Due to changes in valuation inputs or assumptions
346

 
(5,762
)
Due to other changes in fair value (7)
(3,016
)
 
(2,469
)
Carrying value, at end of period
$
50,776

 
$
40,717

(7)
Represents the realization of expected net servicing cash flows, expected borrower repayments and the passage of time.
The following table summarizes the Company's sales of loans originated for sale in the secondary market.
 
Three Months Ended March 31,
 
2017
 
2016
 
(In Thousands)
Residential real estate loans originated for sale in the secondary market sold (1)
$
172,206

 
$
128,911

Net gains recognized on sales of residential real estate loans originated for sale in the secondary market (2)
4,621

 
5,768

(1)
Includes loans originated for sale where the Company retained servicing responsibilities.
(2)
Net gains were recorded in mortgage banking income in the Company's Unaudited Condensed Consolidated Statements of Income.
Residential Real Estate Mortgage Loans Sold with Retained Servicing
The following table summarizes the Company's activity related to residential real estate mortgage loans sold with retained servicing.
 
Three Months Ended March 31,
 
2017
 
2016
 
(In Thousands)
Residential real estate mortgage loans sold with retained servicing (3)
$
172,206

 
$
444,807

Servicing fees recognized (4)
6,490

 
6,063

(3)
There is no recourse to the Company for the failures of borrowers to pay loans when due.
(4)
Recorded as a component of other noninterest income in the Company's Unaudited Condensed Consolidated Statements of Income.

The following table provides the recorded balance of loans sold with retained servicing and the related MSRs.
 
March 31, 2017
 
December 31, 2016
 
(In Thousands)
Recorded balance of residential real estate mortgage loans sold with retained servicing (5)
$
4,691,319

 
$
4,684,899

MSRs (6)
50,776

 
51,428

(5)
These loans are not included in loans on the Company's Unaudited Condensed Consolidated Balance Sheets.
(6)
Recorded under the fair value method and included in other assets on the Company's Unaudited Condensed Consolidated Balance Sheets.
Schedule of sensitivity of current fair value of residential real estate mortgage servicing rights
At March 31, 2017 and December 31, 2016, the sensitivity of the current fair value of the residential MSRs to immediate 10% and 20% adverse changes in key economic assumptions are included in the following table:
 
March 31, 2017
 
December 31, 2016
 
(Dollars in Thousands)
Fair value of MSRs
$
50,776

 
$
51,428

Composition of residential loans serviced for others:
 
 
 
Fixed rate mortgage loans
97.4
%
 
97.3
%
Adjustable rate mortgage loans
2.6

 
2.7

Total
100.0
%
 
100.0
%
Weighted average life (in years)
7.0

 
6.5

Prepayment speed:
6.6
%
 
15.7
%
Effect on fair value of a 10% increase
$
(1,502
)
 
$
(1,646
)
Effect on fair value of a 20% increase
(2,909
)
 
(3,184
)
Weighted average option adjusted spread:
8.7
%
 
8.1
%
Effect on fair value of a 10% increase
$
(1,756
)
 
$
(1,758
)
Effect on fair value of a 20% increase
(3,400
)
 
(3,402
)