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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2016
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
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, 2016
 
December 31, 2015
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
286,414

 
$
286,971

 
$
293,637

 
$
299,505

Residential mortgage loan commitments
 
318,359

 
9,733

 
601,147

 
8,134

Forward sales contracts
 
569,543

 
5,193

 
884,710

 
800

 
 
 

 
$
301,897

 
 

 
$
308,439
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended
 
 
2016
 
2015
 
2014
Production revenue:
 
 
 
 
 
 
Net realized gains on sales of mortgage loans
 
$
68,947

 
$
67,407

 
$
56,696

Net change in unrealized gain on mortgage loans held for sale
 
(5,311
)
 
(784
)
 
5,357

Net change in the fair value of mortgage loan commitments
 
1,599

 
(1,837
)
 
7,315

Net change in the fair value of forward sales contracts
 
4,393

 
4,801

 
(8,307
)
Total production revenue
 
69,628

 
69,587

 
61,061

Servicing revenue
 
64,286

 
56,415

 
48,032

Total mortgage banking revenue
 
$
133,914

 
$
126,002

 
$
109,093
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
December 31,
 
 
2016
 
2015
 
2014
Number of residential mortgage loans serviced for others
 
139,340

 
131,859

 
117,483

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,997,568

 
$
19,678,226

 
$
16,162,887

Weighted average interest rate
 
3.97
%
 
4.12
%
 
4.29
%
Remaining contractual term (in months)
 
301

 
300

 
296
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]

Activity in capitalized mortgage servicing rights during the three years ended December 31, 2016 is as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
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

Additions, net
 
—

 
79,546

 
79,546

Change in fair value due to loan runoff
 
(2,645
)
 
(25,419
)
 
(28,064
)
Change in fair value due to market changes
 
1,442

 
(6,295
)
 
(4,853
)
Balance, December 31, 2015
 
9,911

 
208,694

 
218,605

Additions, net
 
—

 
71,405

 
71,405

Change in fair value due to loan runoff
 
(2,844
)
 
(37,900
)
 
(40,744
)
Change in fair value due to market changes
 
1,842

 
(4,035
)
 
(2,193
)
Balance, December 31, 2016
 
$
8,909

 
$
238,164

 
$
247,073
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,
 
 
2016
 
2015
Discount rate – risk-free rate plus a market premium
 
10.08%
 
10.11%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.98%-16.91%
 
7.41% - 23.88%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$63 - $120
 
$63 - $105
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$650 - $4,250
 
$650 - $4,250
Primary/secondary mortgage rate spread
 
105 bps
 
130 bps
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.98%
 
1.73%
Aging Status of Mortgage Loans Serviced For Others [Table Text Block]
The aging status of our mortgage loans serviced for others by investor at December 31, 2016 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
7,950,818

 
$
52,434

 
$
9,812

 
$
25,670

 
$
8,038,734

FNMA
 
6,922,833

 
44,532

 
11,233

 
21,486

 
7,000,084

GNMA
 
6,304,914

 
181,669

 
56,534

 
22,471

 
6,565,588

Other
 
390,109

 
763

 
351

 
1,939

 
393,162

Total
 
$
21,568,674

 
$
279,398

 
$
77,930

 
$
71,566

 
$
21,997,568
Activity in Accrual for Losses On Loans Sold With Recourse [Table Text Block]
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
 
2016
 
2015
 
2014
Beginning balance
$
4,649

 
$
7,299

 
$
9,562

Provision for recourse losses
725

 
(982
)
 
354

Loans charged off, net
(1,358
)
 
(1,668
)
 
(2,617
)
Ending balance
$
4,016

 
$
4,649

 
$
7,299
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,
 
2016
 
2015
Number of unresolved deficiency requests
233

 
198

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
17,382

 
$
15,624

Unpaid principal balance subject to indemnification by the Company
5,803

 
4,365
Activity in Accruals for Mortgage Losses [Table Text Block]
The activity in the accruals for mortgage losses related to repurchases is summarized as follows (in thousands).
 
December 31,
 
2016
 
2015
Beginning balance
$
3,359

 
$
3,220

Provision for losses
27

 
353

Charge-offs, net
(598
)
 
(214
)
Ending balance
$
2,788

 
$
3,359