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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014
 
December 31, 2013
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
291,537

 
$
298,212

 
$
192,266

 
$
193,584

Residential mortgage loan commitments
 
520,829

 
9,971

 
258,873

 
2,656

Forward sales contracts
 
701,066

 
(4,001
)
 
435,867

 
4,306

 
 
 

 
$
304,182

 
 

 
$
200,546
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended
 
 
2014
 
2013
 
2012
Production revenue:
 
 
 
 
 
 
Net realized gains on sales of mortgage loans
 
$
56,696

 
$
95,309

 
$
115,879

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

 
(10,899
)
 
4,720

Change in the fair value of mortgage loan commitments
 
7,315

 
(10,077
)
 
6,136

Change in the fair value of forward sales contracts
 
(8,307
)
 
5,212

 
2,382

Total production revenue
 
61,061

 
79,545

 
129,117

Servicing revenue
 
48,032

 
42,389

 
40,185

Total mortgage banking revenue
 
$
109,093

 
$
121,934

 
$
169,302
Summary of Mortgage Servicing Rights
 
 
December 31,
 
 
2014
 
2013
 
2012
Number of residential mortgage loans serviced for others
 
117,483

 
106,137

 
98,246

Outstanding principal balance of residential mortgage loans serviced for others
 
$
16,162,887

 
$
13,718,942

 
$
11,981,624

Weighted average interest rate
 
4.29
%
 
4.40
%
 
4.71
%
Remaining term (in months)
 
296

 
292

 
289
Activity in Capitalized Mortgage Servicing Rights

Activity in capitalized mortgage servicing rights during the three years ended December 31, 2014 is as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
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

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
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,
 
 
2014
 
2013
Discount rate – risk-free rate plus a market premium
 
10.17%
 
10.21%
Prepayment rate – based upon loan interest rate, original term and loan type
 
7.70% - 30.44%
 
6.66% - 26.19%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$60 - $105
 
$60 - $105
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000 - $4,250
 
$1,000 - $4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.77%
 
1.80%
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, 2014 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%
 
5.00% - 5.99%
 
> 5.99%
 
Total
Fair value
 
$
67,412

 
$
80,405

 
$
19,383

 
$
4,776

 
$
171,976

Outstanding principal of loans serviced for others
 
6,332,112

 
6,882,025

 
1,989,977

 
958,773

 
16,162,887

Weighted average prepayment rate1
 
7.70
%
 
8.58
%
 
14.50
%
 
30.44
%
 
10.26
%
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, 2014 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
5,289,078

 
$
37,881

 
$
9,418

 
$
33,837

 
$
5,370,214

FNMA
 
5,200,509

 
27,089

 
5,736

 
22,087

 
5,255,421

GNMA
 
4,920,064

 
132,680

 
34,602

 
13,594

 
5,100,940

Other
 
422,598

 
6,674

 
1,491

 
5,549

 
436,312

Total
 
$
15,832,249

 
$
204,324

 
$
51,247

 
$
75,067

 
$
16,162,887
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
 
2014
 
2013
 
2012
Beginning balance
$
9,562

 
$
13,158

 
$
18,683

Provision for recourse losses
354

 
517

 
(100
)
Loans charged off, net
(2,617
)
 
(4,113
)
 
(5,425
)
Ending balance
$
7,299

 
$
9,562

 
$
13,158
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,
 
2014
 
2013
Number of unresolved deficiency requests
186

 
578

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
15,328

 
$
69,288

Unpaid principal balance subject to indemnification by the Company
4,047

 
3,200
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,
 
2014
 
2013
Beginning balance
$
12,716

 
$
8,983

Provision for losses
7,200

 
6,221

Charge-offs, net
(8,048
)
 
(2,488
)
Ending balance
$
11,868

 
$
12,716