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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2012
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 loans 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, 2012
 
December 31, 2011
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
269,718

 
$
281,935

 
$
177,319

 
$
184,816

Residential mortgage loan commitments
 
356,634

 
12,733

 
189,770

 
6,597

Forward sales contracts
 
598,442

 
(906
)
 
349,447

 
(3,288
)
 
 
 

 
$
293,762

 
 

 
$
188,125
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
Originating and marketing revenue:
 
 
 
 
 
 
Residential mortgages loan held for sale
 
$
120,599

 
$
57,418

 
$
45,243

Residential mortgage loan commitments
 
6,136

 
4,345

 
1,755

Forward sales contracts
 
2,382

 
(9,781
)
 
2,440

Total originating and marketing revenue
 
129,117

 
51,982

 
49,438

Servicing revenue
 
40,185

 
39,661

 
38,162

Total mortgage banking revenue
 
$
169,302

 
$
91,643

 
$
87,600
Summary of Mortgage Servicing Rights
The following represents a summary of mortgage servicing rights (Dollars in thousands):

 
 
December 31,
2012
 
December 31,
2011
 
December 31,
2010
Number of residential mortgage loans serviced for others
 
98,246

 
95,841

 
96,443

Outstanding principal balance of residential mortgage loans serviced for others
 
$
11,981,624

 
$
11,300,986

 
$
11,194,582

Weighted average interest rate
 
4.71
%
 
5.19
%
 
5.44
%
Remaining term (in months)
 
289

 
290

 
292
Activity in Capitalized Mortgage Servicing Rights

Activity in capitalized mortgage servicing rights during the three years ended December 31, 2012 is as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2009
 
$
7,828

 
$
65,996

 
$
73,824

Additions, net
 
31,321

 
27,603

 
58,924

Gain on purchase of mortgage servicing rights
 
11,832

 
—

 
11,832

Change in fair value due to loan runoff
 
(6,791
)
 
(13,895
)
 
(20,686
)
Change in fair value due to market changes
 
(6,290
)
 
(1,881
)
 
(8,171
)
Balance, December 31, 2010
 
$
37,900

 
$
77,823

 
$
115,723

Additions, net
 
—

 
26,251

 
26,251

Change in fair value due to loan runoff
 
(4,699
)
 
(10,045
)
 
(14,744
)
Change in fair value due to market changes
 
(14,298
)
 
(26,149
)
 
(40,447
)
Balance, December 31, 2011
 
$
18,903

 
$
67,880

 
$
86,783

Additions, net
 
—

 
42,191

 
42,191

Change in fair value due to loan runoff
 
(4,164
)
 
(14,788
)
 
(18,952
)
Change in fair value due to market changes
 
(1,763
)
 
(7,447
)
 
(9,210
)
Balance, December 31, 2012
 
$
12,976

 
$
87,836

 
$
100,812
Assumptions to Value Mortgage Servicing Rights [Table Text Block]

There is no active market for trading in mortgage servicing rights after origination. Fair value is determined by discounting the projected net cash flows. Significant assumptions used to determine fair value considered to be significant unobservable inputs were as follows:

 
 
December 31,
2012
 
December 31,
2011
Discount rate – risk-free rate plus a market premium
 
10.29%
 
10.34%
Prepayment rate – based upon loan interest rate, original term and loan type
 
8.38% - 43.94%
 
10.88% - 49.68%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$55 - $105
 
$55 - $105
Delinquent loans
 
$135 - $500
 
$50 - $250
Loans in foreclosure
 
$875 - $4,250
 
$500 - $3,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
0.87%
 
1.21%
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, 2012 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%
 
5.00% - 5.99%
 
> 5.99%
 
Total
Fair value
 
$
33,456

 
$
40,560

 
$
21,472

 
$
5,324

 
$
100,812

Outstanding principal of loans serviced for others
 
$
3,351,636

 
$
3,982,534

 
$
3,030,001

 
$
1,617,453

 
$
11,981,624

Weighted average prepayment rate1
 
8.38
%
 
9.83
%
 
24.07
%
 
43.94
%
 
17.63
%
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, 2012 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
4,668,434

 
$
41,298

 
$
12,981

 
$
39,509

 
$
4,762,222

FNMA
 
2,622,914

 
18,803

 
5,393

 
18,991

 
2,666,101

GNMA
 
3,903,284

 
130,869

 
35,408

 
18,958

 
4,088,519

Other
 
447,142

 
9,288

 
2,128

 
6,224

 
464,782

Total
 
$
11,641,774

 
$
200,258

 
$
55,910

 
$
83,682

 
$
11,981,624
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 December 31,
 
2012
 
2011
 
2010
Beginning balance
$
18,683

 
$
16,667

 
$
13,781

Provision for recourse losses
(1,891
)
 
8,611

 
7,895

Loans charged off, net
(5,433
)
 
(6,595
)
 
(5,009
)
Ending balance
$
11,359

 
$
18,683

 
$
16,667
Residential Mortgage Loans Subject to Repurchase Under Standard Representation and Warranties [Table Text Block]
A summary of unresolved deficiency requests or from the agencies and related accrual for credit losses follows (in thousands):
 
December 31,
 
2012
 
2011
Number of unresolved deficiency requests
389

 
247

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
44,831

 
$
36,978

Unpaid principal balance subject to indemnification by the Company
1,233

 
870

Accrual for credit losses related to potential loan repurchases under representations and warranties
5,291

 
2,216