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Mortgage Banking Activities (Tables)
 9 Months Ended
Sep. 30, 2016
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
September 30, 2016
 
Dec. 31, 2015
 
September 30, 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
 
$
422,523

 
$
433,040

 
$
293,637

 
$
299,505

 
$
336,974

 
$
348,400

Residential mortgage loan commitments
 
630,804

 
18,598

 
601,147

 
8,134

 
742,742

 
18,161

Forward sales contracts
 
929,907

 
(4,046
)
 
884,710

 
800

 
1,073,343

 
(9,147
)
 
 
 

 
$
447,592

 
 

 
$
308,439

 
 

 
$
357,414
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
Sept. 30,
 
Nine Months Ended
September 30,
 
 
2016
 
2015
 
2016
 
2015
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
27,142

 
$
18,968

 
$
57,126

 
$
60,075

Net change in unrealized gain on mortgage loans held for sale
 
(2,518
)
 
6,666

 
4,649

 
4,751

Net change in the fair value of mortgage loan commitments
 
(6,901
)
 
9,838

 
10,464

 
8,190

Net change in the fair value of forward sales contracts
 
8,267

 
(16,755
)
 
(4,846
)
 
(5,146
)
Total production revenue
 
25,990

 
18,717

 
67,393

 
67,870

Servicing revenue
 
16,558

 
14,453

 
47,809

 
41,466

Total mortgage banking revenue
 
$
42,548

 
$
33,170

 
$
115,202

 
$
109,336
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
September 30,
2016
 
Dec. 31,
2015
 
September 30,
2015
Number of residential mortgage loans serviced for others
 
139,587

 
131,859

 
128,828

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,851,536

 
$
19,678,226

 
$
18,928,726

Weighted average interest rate
 
4.01
%
 
4.12
%
 
4.15
%
Remaining term (in months)
 
302

 
300

 
300
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended September 30, 2016 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, June 30, 2016
 
$
4,067

 
$
186,680

 
$
190,747

Additions, net
 
—

 
21,990

 
21,990

Change in fair value due to scheduled payments and full-balance payoffs
 
(753
)
 
(10,690
)
 
(11,443
)
Change in fair value due to market assumption changes
 
251

 
2,076

 
2,327

Balance, Sept. 30, 2016
 
$
3,565

 
$
200,056

 
$
203,621


Activity in capitalized mortgage servicing rights during the nine months ended September 30, 2016 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2015
 
$
9,911

 
$
208,694

 
$
218,605

Additions, net
 
—

 
56,345

 
56,345

Change in fair value due to scheduled payments and full-balance payoffs
 
(2,109
)
 
(27,276
)
 
(29,385
)
Change in fair value due to market assumption changes
 
(4,237
)
 
(37,707
)
 
(41,944
)
Balance, Sept. 30, 2016
 
$
3,565

 
$
200,056

 
$
203,621

Activity in capitalized mortgage servicing rights during the three months ended September 30, 2015 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, June 30, 2015
 
$
10,730

 
$
187,964

 
$
198,694

Additions, net
 
—

 
19,993

 
19,993

Change in fair value due to scheduled payments and full-balance payoffs
 
(661
)
 
(6,220
)
 
(6,881
)
Change in fair value due to market assumption changes
 
(656
)
 
(11,101
)
 
(11,757
)
Balance, Sept. 30, 2015
 
$
9,413

 
$
190,636

 
$
200,049



Activity in capitalized mortgage servicing rights during the nine months ended September 30, 2015 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2014
 
$
11,114

 
$
160,862

 
$
171,976

Additions, net
 
—

 
62,375

 
62,375

Change in fair value due to scheduled payments and full-balance payoffs
 
(2,171
)
 
(19,862
)
 
(22,033
)
Change in fair value due to market assumption changes
 
470

 
(12,739
)
 
(12,269
)
Balance, Sept. 30, 2015
 
$
9,413

 
$
190,636

 
$
200,049
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:
 
 
September 30,
2016
 
Dec. 31,
2015
 
September 30,
2015
Discount rate – risk-free rate plus a market premium
 
10.08%
 
10.11%
 
10.12%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
Performing loans
 
$63-$120
 
$63 - $105
 
$63 - $105
Delinquent loans
 
$150 - $500
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$650 - $4,250
 
$650 - $4,250
 
$650 - $4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.18%
 
1.73%
 
1.40%
Primary/secondary mortgage rate spread
 
115 bps
 
130 bps
 
135 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 September 30, 2016 follows (in thousands):
 
 
< 4.00%
 
4.00% - 4.99%

 
5.00% - 5.99%

 
> 5.99%
 
Total
Fair value
 
$
121,802

 
$
74,830

 
$
4,968

 
$
2,021

 
$
203,621

Outstanding principal of loans serviced for others
 
$
12,145,996

 
$
7,720,311

 
$
1,215,692

 
$
769,537

 
$
21,851,536

Weighted average prepayment rate1
 
9.16
%
 
12.48
%
 
36.75
%
 
47.15
%
 
13.20
%
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 September 30, 2016 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
7,760,547

 
$
34,145

 
$
10,399

 
$
23,938

 
$
7,829,029

FNMA
 
6,944,158

 
43,046

 
8,704

 
17,097

 
7,013,005

GNMA
 
6,338,155

 
150,386

 
48,790

 
16,624

 
6,553,955

Other
 
452,083

 
1,219

 
596

 
1,649

 
455,547

Total
 
$
21,494,943

 
$
228,796

 
$
68,489

 
$
59,308

 
$
21,851,536
Activity in Allowance for Losses On Loans Sold With Recourse [Table Text Block]
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Beginning balance
$
4,339

 
$
6,691

 
$
4,649

 
$
7,299

Provision for recourse losses
113

 
81

 
504

 
211

Loans charged off, net
(235
)
 
(506
)
 
(936
)
 
(1,244
)
Ending balance
$
4,217

 
$
6,266

 
$
4,217

 
$
6,266
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):
 
September 30,
 
2016
 
2015
Number of unresolved deficiency requests
221

 
194

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
15,750

 
$
14,237

Unpaid principal balance subject to indemnification by the Company
5,399

 
4,604
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
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Beginning balance
$
8,043

 
$
8,908

 
$
7,732

 
$
11,868

Provision for losses
1,357

 
(52
)
 
5,260

 
(3,056
)
Charge-offs, net
(1,758
)
 
(1,262
)
 
(5,350
)
 
(1,218
)
Ending balance
$
7,642


$
7,594


$
7,642


$
7,594