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Mortgage Banking Activities (Tables)
 6 Months Ended
Jun. 30, 2013
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
June 30, 2013
 
December 31, 2012
 
June 30, 2012
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid
Principal
 Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
284,454

 
$
280,962

 
$
269,718

 
$
281,935

 
$
236,160

 
$
247,893

Residential mortgage loan commitments
 
547,508

 
(1,709
)
 
356,634

 
12,733

 
392,247

 
15,807

Forward sales contracts
 
740,752

 
21,804

 
598,442

 
(906
)
 
605,856

 
(4,526
)
 
 
 

 
$
301,057

 
 

 
$
293,762

 
 

 
$
259,174
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30, 2013
 
June 30, 2012
 
June 30, 2013
 
June 30, 2012
Originating and marketing revenue:
 
 
 
 
 
 
 
 
Residential mortgages loan held for sale
 
$
17,763

 
$
27,706

 
$
47,998

 
$
44,798

Residential mortgage loan commitments
 
(15,052
)
 
6,900

 
(14,442
)
 
9,210

Forward sales contracts
 
23,645

 
(4,917
)
 
22,710

 
(1,238
)
Total originating and marketing revenue
 
26,356

 
29,689

 
56,266

 
52,770

Servicing revenue
 
10,240

 
9,859

 
20,306

 
19,856

Total mortgage banking revenue
 
$
36,596

 
$
39,548

 
$
76,572

 
$
72,626
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
June 30, 2013
 
December 31, 2012
 
June 30, 2012
Number of residential mortgage loans serviced for others
 
101,498

 
98,246

 
96,772

Outstanding principal balance of residential mortgage loans serviced for others
 
$
12,741,651

 
$
11,981,624

 
$
11,564,643

Weighted average interest rate
 
4.47
%
 
4.71
%
 
4.99
%
Remaining term (in months)
 
291

 
289

 
289
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended June 30, 2013 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Mar. 31, 2013
 
$
13,203

 
$
96,637

 
$
109,840

Additions, net
 
—

 
14,499

 
14,499

Change in fair value due to loan runoff
 
(940
)
 
(4,825
)
 
(5,765
)
Change in fair value due to market changes
 
3,319

 
10,996

 
14,315

Balance, June 30, 2013
 
$
15,582

 
$
117,307

 
$
132,889


Activity in capitalized mortgage servicing rights during the six months ended June 30, 2013 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2012
 
$
12,976

 
$
87,836

 
$
100,812

Additions, net
 
—

 
25,932

 
25,932

Change in fair value due to loan runoff
 
(1,811
)
 
(9,017
)
 
(10,828
)
Change in fair value due to market changes
 
4,417

 
12,556

 
16,973

Balance, June 30, 2013
 
$
15,582

 
$
117,307

 
$
132,889


Activity in capitalized mortgage servicing rights during the three months ended June 30, 2012 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Mar. 31, 2012
 
$
21,204

 
$
76,934

 
$
98,138

Additions, net
 
—

 
9,275

 
9,275

Change in fair value due to loan runoff
 
(950
)
 
(3,230
)
 
(4,180
)
Change in fair value due to market changes
 
(3,893
)
 
(7,557
)
 
(11,450
)
Balance, June 30, 2012
 
$
16,361

 
$
75,422

 
$
91,783


Activity in capitalized mortgage servicing rights during the six months ended June 30, 2012 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2011
 
$
18,903

 
$
67,880

 
$
86,783

Additions, net
 
—

 
17,647

 
17,647

Change in fair value due to loan runoff
 
(1,960
)
 
(6,364
)
 
(8,324
)
Change in fair value due to market changes
 
(582
)
 
(3,741
)
 
(4,323
)
Balance, June 30, 2012
 
$
16,361

 
$
75,422

 
$
91,783
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 based on significant unobservable input were as follows:

 
 
June 30, 2013
 
December 31, 2012
 
June 30, 2012
Discount rate – risk-free rate plus a market premium
 
10.25%
 
10.29%
 
10.33%
Prepayment rate – based upon loan interest rate, original term and loan type
 
7.00% - 32.30%
 
8.38% - 43.94%
 
11.44% - 53.10%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
    Performing loans
 
$58 - $105
 
$55 - $105
 
$55 - $105
    Delinquent loans
 
$135 - $500
 
$135 - $500
 
$135 - $500
    Loans in foreclosure
 
$875 - $4,250
 
$875 - $4,250
 
$875 - $3,750
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.56%
 
0.87%
 
1.28%
Stratification of Loan Servicing Portfolio [Table Text Block]
Stratification of the residential mortgage loan servicing portfolio and outstanding principal of loans serviced for others by interest rate at June 30, 2013 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%

 
5.00% - 5.99%

 
> 5.99%
 
Total
Fair value
 
$
57,807

 
$
41,673

 
$
26,815

 
$
6,594

 
$
132,889

Outstanding principal of loans serviced for others
 
$
5,075,651

 
$
3,739,420

 
$
2,551,306

 
$
1,375,274

 
$
12,741,651

Weighted average prepayment rate1
 
7.00
%
 
8.51
%
 
12.70
%
 
32.30
%
 
11.31
%
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 [Table Text Block]
The aging status of our mortgage loans serviced for others by investor at June 30, 2013 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
4,496,062

 
$
41,399

 
$
9,992

 
$
36,381

 
$
4,583,834

FNMA
 
3,409,245

 
24,891

 
5,136

 
16,941

 
3,456,213

GNMA
 
4,245,789

 
143,568

 
31,781

 
13,973

 
4,435,111

Other
 
258,397

 
2,103

 
620

 
5,373

 
266,493

Total
 
$
12,409,493

 
$
211,961

 
$
47,529

 
$
72,668

 
$
12,741,651
Activity in Allowance for Losses On Loans Sold With Recourse [Table Text Block]
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2013
 
2012
 
2013
 
2012
Beginning balance
 
$
10,075

 
$
18,651

 
$
11,359

 
$
18,683

Provision for recourse losses
 
430

 
768

 
(331
)
 
2,440

Loans charged off, net
 
(840
)
 
(1,587
)
 
(1,363
)
 
(3,291
)
Ending balance
 
$
9,665

 
$
17,832

 
$
9,665

 
$
17,832
Summary of Unresolved Deficiency Requests and Related Accrual for Credit Losses [Table Text Block]
A summary of unresolved deficiency requests from the agencies and related accrual for credit losses follows (in thousands):
 
June 30, 2013
 
December 31, 2012
Number of unresolved deficiency requests
464

 
389

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
55,517

 
$
44,831

Unpaid principal balance subject to indemnification by the Company
1,774

 
1,233

Accrual for credit losses related to potential loan repurchases under representations and warranties
6,181

 
5,291