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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2016
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
March 31, 2016
 
Dec. 31, 2015
 
March 31, 2015
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid
Principal
 Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
309,040

 
$
318,191

 
$
293,637

 
$
299,505

 
$
491,762

 
$
501,888

Residential mortgage loan commitments
 
902,986

 
20,170

 
601,147

 
8,134

 
824,036

 
17,500

Forward sales contracts
 
1,012,041

 
(6,321
)
 
884,710

 
800

 
1,200,769

 
(6,192
)
 
 
 

 
$
332,040

 
 

 
$
308,439

 
 

 
$
513,196
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
March 31,
 
 
2016
 
2015
Production revenue:
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
10,779

 
$
17,251

Net change in unrealized gain on mortgage loans held for sale
 
3,283

 
3,451

Net change in the fair value of mortgage loan commitments
 
12,036

 
7,529

Net change in the fair value of forward sales contracts
 
(7,121
)
 
(2,191
)
Total production revenue
 
18,977

 
26,040

Servicing revenue
 
15,453

 
13,280

Total mortgage banking revenue
 
$
34,430

 
$
39,320
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
March 31,
2016
 
Dec. 31,
2015
 
March 31,
2015
Number of residential mortgage loans serviced for others
 
134,040

 
131,859

 
120,653

Outstanding principal balance of residential mortgage loans serviced for others
 
$
20,294,662

 
$
19,678,226

 
$
16,937,128

Weighted average interest rate
 
4.10
%
 
4.12
%
 
4.24
%
Remaining term (in months)
 
300

 
300

 
297
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2016 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2015
 
$
9,911

 
$
208,694

 
$
218,605

Additions, net
 
—

 
13,582

 
13,582

Change in fair value due to loan runoff
 
(626
)
 
(7,518
)
 
(8,144
)
Change in fair value due to market changes
 
(3,336
)
 
(24,652
)
 
(27,988
)
Balance, March 31, 2016
 
$
5,949

 
$
190,106

 
$
196,055

 
 
Activity in capitalized mortgage servicing rights during the three months ended March 31, 2015 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2014
 
$
11,114

 
$
160,862

 
$
171,976

Additions, net
 
—

 
19,150

 
19,150

Change in fair value due to loan runoff
 
(781
)
 
(6,772
)
 
(7,553
)
Change in fair value due to market changes
 
(740
)
 
(7,782
)
 
(8,522
)
Balance, March 31, 2015
 
$
9,593

 
$
165,458

 
$
175,051

 
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 inputs were as follows:

 
 
March 31,
2016
 
Dec. 31,
2015
 
March 31,
2015
Discount rate – risk-free rate plus a market premium
 
10.11%
 
10.11%
 
10.15%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
    Performing loans
 
$63-$120
 
$63 - $105
 
$60 - $105
    Delinquent loans
 
$150 - $500
 
$150 - $500
 
$150 - $500
    Loans in foreclosure
 
$650 - $4,250
 
$650 - $4,250
 
$1000 - $4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.19%
 
1.73%
 
1.54%
Primary/secondary mortgage rate spread
 
120 bps
 
130 bps
 
138 bps
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, 2016 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%

 
5.00% - 5.99%

 
> 5.99%
 
Total
Fair value
 
$
98,157

 
$
85,587

 
$
8,969

 
$
3,342

 
$
196,055

Outstanding principal of loans serviced for others
 
$
9,938,179

 
$
8,107,804

 
$
1,393,590

 
$
855,089

 
$
20,294,662

Weighted average prepayment rate1
 
8.88
%
 
9.95
%
 
23.48
%
 
35.21
%
 
11.42
%
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, 2016 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
6,767,400

 
$
34,920

 
$
7,482

 
$
25,224

 
$
6,835,026

FNMA
 
6,835,689

 
29,996

 
5,252

 
17,303

 
6,888,240

GNMA
 
5,851,935

 
109,046

 
33,308

 
15,338

 
6,009,627

Other
 
555,737

 
3,587

 
475

 
1,970

 
561,769

Total
 
$
20,010,761

 
$
177,549

 
$
46,517

 
$
59,835

 
$
20,294,662
Activity in Allowance for Losses On Loans Sold With Recourse [Table Text Block]
 
Three Months Ended
March 31,
 
2016
 
2015
Beginning balance
$
4,649

 
$
7,299

Provision for recourse losses
146

 
170

Loans charged off, net
(352
)
 
(448
)
Ending balance
$
4,443

 
$
7,021
Summary of Unresolved Deficiency Requests and Related Accrual for Credit Losses [Table Text Block]
A summary of unresolved deficiency requests from the agencies follows (in thousands, except for number of unresolved deficiency requests):
 
March 31,
2016
 
March 31,
2015
Number of unresolved deficiency requests
220

 
213

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
20,292

 
$
17,979

Unpaid principal balance subject to indemnification by the Company
4,668

 
4,212
Activity in Accruals for Mortgage Losses [Table Text Block]
The activity in the accruals for mortgage losses is summarized as follows (in thousands).
 
Three Months Ended
March 31,
 
2016
 
2015
Beginning balance
$
7,732

 
$
11,868

Provision for losses
1,350

 
(788
)
Charge-offs, net
(953
)
 
60

Ending balance
$
8,129


$
11,140