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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2013
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
March 31, 2013
 
December 31, 2012
 
March 31, 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
 
$
264,608

 
$
274,710

 
$
269,718

 
$
281,935

 
$
230,241

 
$
237,741

Residential mortgage loan commitments
 
466,571

 
13,343

 
356,634

 
12,733

 
302,303

 
8,907

Forward sales contracts
 
712,144

 
(1,842
)
 
598,442

 
(906
)
 
520,165

 
391

 
 
 

 
$
286,211

 
 

 
$
293,762

 
 

 
$
247,039
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
 
 
March 31,
2013
 
March 31,
2012
Originating and marketing revenue:
 
 
 
 
Residential mortgages loan held for sale
 
$
30,235

 
$
17,092

Residential mortgage loan commitments
 
610

 
2,310

Forward sales contracts
 
(935
)
 
3,679

Total originating and marketing revenue
 
29,910

 
23,081

Servicing revenue
 
10,066

 
9,997

Total mortgage banking revenue
 
$
39,976

 
$
33,078
Summary of Mortgage Servicing Rights [Table Text Block]
 
 
March 31,
2013
 
December 31,
2012
 
March 31,
2012
Number of residential mortgage loans serviced for others
 
99,438

 
98,246

 
95,944

Outstanding principal balance of residential mortgage loans serviced for others
 
$
12,272,691

 
$
11,981,624

 
$
11,378,806

Weighted average interest rate
 
4.59
%
 
4.71
%
 
5.09
%
Remaining term (in months)
 
290

 
289

 
289
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2013 is as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2012
 
$
12,976

 
$
87,836

 
$
100,812

Additions, net
 
—

 
11,433

 
11,433

Change in fair value due to loan runoff
 
(871
)
 
(4,192
)
 
(5,063
)
Change in fair value due to market changes
 
1,098

 
1,560

 
2,658

Balance, March 31, 2013
 
$
13,203

 
$
96,637

 
$
109,840


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

 
$
67,880

 
$
86,783

Additions, net
 
—

 
8,372

 
8,372

Change in fair value due to loan runoff
 
(1,010
)
 
(3,134
)
 
(4,144
)
Change in fair value due to market changes
 
3,311

 
3,816

 
7,127

Balance, March 31, 2012
 
$
21,204

 
$
76,934

 
$
98,138
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 input were as follows:

 
 
March 31,
2013
 
December 31,
2012
 
March 31,
2012
Discount rate – risk-free rate plus a market premium
 
10.27%
 
10.29%
 
10.33%
Prepayment rate – based upon loan interest rate, original term and loan type
 
8.10% - 41.21%
 
8.38% - 43.94%
 
10.01% - 45.98%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
    Performing loans
 
$55 - $105
 
$55 - $105
 
$55 - $105
    Delinquent loans
 
$135 - $500
 
$135 - $500
 
$50 - $250
    Loans in foreclosure
 
$875 - $4,250
 
$875 - $4,250
 
$500 - $3,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
0.97%
 
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 March 31, 2013 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%

 
5.00% - 5.99%

 
> 5.99%
 
Total
Fair value
 
$
42,981

 
$
38,471

 
$
22,991

 
$
5,397

 
$
109,840

Outstanding principal of loans serviced for others
 
$
4,139,279

 
$
3,844,365

 
$
2,790,646

 
$
1,498,401

 
$
12,272,691

Weighted average prepayment rate1
 
8.10
%
 
10.60
%
 
19.67
%
 
41.21
%
 
15.55
%
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 March 31, 2013 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
4,583,387

 
$
33,374

 
$
8,253

 
$
37,211

 
$
4,662,225

FNMA
 
2,959,423

 
19,375

 
4,064

 
17,945

 
3,000,807

GNMA
 
4,219,579

 
112,968

 
20,962

 
11,391

 
4,364,900

Other
 
237,717

 
1,431

 
567

 
5,044

 
244,759

Total
 
$
12,000,106

 
$
167,148

 
$
33,846

 
$
71,591

 
$
12,272,691
Activity in Allowance for Losses On Loans Sold With Recourse [Table Text Block]
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
2012
Beginning balance
 
$
11,359

 
$
18,683

Provision for recourse losses
 
(761
)
 
1,672

Loans charged off, net
 
(523
)
 
(1,704
)
Ending balance
 
$
10,075

 
$
18,651
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):
 
March 31,
2013
 
December 31,
2012
Number of unresolved deficiency requests
430

 
389

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
50,861

 
$
44,831

Unpaid principal balance subject to indemnification by the Company
1,414

 
1,233

Accrual for credit losses related to potential loan repurchases under representations and warranties
5,877

 
5,291