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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale
The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments and forward contract sales and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands):
 
 
December 31, 2015
 
December 31, 2014
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
293,637

 
$
299,505

 
$
291,537

 
$
298,212

Residential mortgage loan commitments
 
601,147

 
8,134

 
627,505

 
9,971

Forward sales contracts
 
884,710

 
800

 
701,066

 
(4,001
)
 
 
 

 
$
308,439

 
 

 
$
304,182
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended
 
 
2015
 
2014
 
2013
Production revenue:
 
 
 
 
 
 
Net realized gains on sales of mortgage loans
 
$
75,780

 
$
56,696

 
$
95,309

Net change in unrealized gain on mortgage loans held for sale
 
(784
)
 
5,357

 
(10,899
)
Net change in the fair value of mortgage loan commitments
 
(1,837
)
 
7,315

 
(10,077
)
Net change in the fair value of forward sales contracts
 
4,801

 
(8,307
)
 
5,212

Total production revenue
 
77,960

 
61,061

 
79,545

Servicing revenue
 
56,415

 
48,032

 
42,389

Total mortgage banking revenue
 
$
134,375

 
$
109,093

 
$
121,934
Summary of Mortgage Servicing Rights
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
December 31,
 
 
2015
 
2014
 
2013
Number of residential mortgage loans serviced for others
 
131,859

 
117,483

 
106,137

Outstanding principal balance of residential mortgage loans serviced for others
 
$
19,678,226

 
$
16,162,887

 
$
13,718,942

Weighted average interest rate
 
4.12
%
 
4.29
%
 
4.40
%
Remaining contractual term (in months)
 
300

 
296

 
292
Activity in Capitalized Mortgage Servicing Rights

Activity in capitalized mortgage servicing rights during the three years ended December 31, 2015 is as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2012
 
$
12,976

 
$
87,836

 
$
100,812

Additions, net
 
—

 
49,431

 
49,431

Change in fair value due to loan runoff
 
(3,029
)
 
(16,601
)
 
(19,630
)
Change in fair value due to market changes
 
5,988

 
16,732

 
22,720

Balance, December 31, 2013
 
15,935

 
137,398

 
153,333

Additions, net
 
—

 
54,413

 
54,413

Change in fair value due to loan runoff
 
(2,357
)
 
(16,968
)
 
(19,325
)
Change in fair value due to market changes
 
(2,464
)
 
(13,981
)
 
(16,445
)
Balance, December 31, 2014
 
11,114

 
160,862

 
171,976

Additions, net
 
—

 
79,546

 
79,546

Change in fair value due to loan runoff
 
(2,645
)
 
(25,419
)
 
(28,064
)
Change in fair value due to market changes
 
1,442

 
(6,295
)
 
(4,853
)
Balance, December 31, 2015
 
$
9,911

 
$
208,694

 
$
218,605
Assumptions to Value Mortgage Servicing Rights [Table Text Block]
Significant assumptions used to determine fair value considered to be significant unobservable inputs were as follows:

 
 
December 31,
 
 
2015
 
2014
Discount rate – risk-free rate plus a market premium
 
10.11%
 
10.17%
Prepayment rate - based upon loan interest rate, original term and loan type
 
7.41% - 23.88%
 
7.70% - 30.44%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$63 - $105
 
$60 - $105
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$650 - $4,250
 
$1,000 - $4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.73%
 
1.77%
Stratification of Loan Servicing Portfolio
Stratification of the residential mortgage loan servicing portfolio and outstanding principal of loans serviced for others by interest rate at December 31, 2015 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%
 
5.00% - 5.99%
 
> 5.99%
 
Total
Fair value
 
$
104,302

 
$
93,090

 
$
16,474

 
$
4,739

 
$
218,605

Outstanding principal of loans serviced for others
 
9,419,078

 
7,897,323

 
1,586,885

 
774,940

 
19,678,226

Weighted average prepayment rate1
 
7.41
%
 
8.55
%
 
12.04
%
 
23.88
%
 
8.89
%
1 
Annual prepayment estimates based upon loan interest rate, original term and loan type. Weighted average prepayment rate is determined by weighting the prepayment speed for each loan by its unpaid principal balance.
Aging Status of Mortgage Loans Serviced For Others
The aging status of our mortgage loans serviced for others by investor at December 31, 2015 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
6,429,145

 
$
37,962

 
$
12,553

 
$
24,373

 
$
6,504,033

FNMA
 
6,723,183

 
35,813

 
5,128

 
19,930

 
6,784,054

GNMA
 
5,688,272

 
147,499

 
47,971

 
18,975

 
5,902,717

Other
 
477,052

 
5,932

 
970

 
3,468

 
487,422

Total
 
$
19,317,652

 
$
227,206

 
$
66,622

 
$
66,746

 
$
19,678,226
Activity in Accrual for Losses On Loans Sold With Recourse
The activity in the accrual for losses on loans sold with recourse included in Other liabilities in the Consolidated Balance Sheets is summarized as follows (in thousands):
 
Year Ended
 
2015
 
2014
 
2013
Beginning balance
$
7,299

 
$
9,562

 
$
13,158

Provision for recourse losses
(982
)
 
354

 
517

Loans charged off, net
(1,668
)
 
(2,617
)
 
(4,113
)
Ending balance
$
4,649

 
$
7,299

 
$
9,562
Summary of Unresolved Deficiency Requests [Table Text Block]
A summary of unresolved deficiency requests from the agencies follows (in thousands, except for number of unresolved deficiency requests):
 
December 31,
 
2015
 
2014
Number of unresolved deficiency requests
198

 
186

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
15,624

 
$
15,328

Unpaid principal balance subject to indemnification by the Company
4,365

 
4,047
Activity in Accruals for Mortgage Losses [Table Text Block]
The activity in the accruals for mortgage losses is summarized as follows (in thousands).
 
December 31,
 
2015
 
2014
Beginning balance
$
11,868

 
$
12,716

Provision for losses
391

 
7,200

Charge-offs, net
(4,527
)
 
(8,048
)
Ending balance
$
7,732

 
$
11,868