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Mortgage Banking Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
June 30, 2017
 
Dec. 31, 2016
 
June 30, 2016
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid
Principal
 Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
269,772

 
$
275,179

 
$
286,414

 
$
286,971

 
$
404,507

 
$
417,542

Residential mortgage loan commitments
 
362,088

 
10,993

 
318,359

 
9,733

 
965,631

 
25,499

Forward sales contracts
 
587,595

 
1,087

 
569,543

 
5,193

 
1,216,966

 
(12,313
)
 
 
 

 
$
287,259

 
 

 
$
301,897

 
 

 
$
430,728
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
11,787

 
$
15,865

 
$
20,402

 
$
24,314

Net change in unrealized gain on mortgage loans held for sale
 
985

 
3,884

 
4,827

 
7,167

Net change in the fair value of mortgage loan commitments
 
(3,274
)
 
5,329

 
1,260

 
17,365

Net change in the fair value of forward sales contracts
 
4,342

 
(5,992
)
 
(4,106
)
 
(13,113
)
Total production revenue
 
13,840

 
19,086

 
22,383

 
35,733

Servicing revenue
 
16,436

 
15,798

 
33,084

 
31,251

Total mortgage banking revenue
 
$
30,276

 
$
34,884

 
$
55,467

 
$
66,984
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
June 30,
2017
 
Dec. 31,
2016
 
June 30,
2016
Number of residential mortgage loans serviced for others
 
138,335

 
139,340

 
137,210

Outstanding principal balance of residential mortgage loans serviced for others
 
$
22,095,232

 
$
21,997,568

 
$
21,178,387

Weighted average interest rate
 
3.95
%
 
3.97
%
 
4.06
%
Remaining term (in months)
 
299

 
301

 
301
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended June 30, 2017 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, March 31, 2017
 
$
8,316

 
$
241,087

 
$
249,403

Additions, net
 
—

 
11,078

 
11,078

Change in fair value due to scheduled payments and full-balance payoffs
 
(464
)
 
(7,835
)
 
(8,299
)
Change in fair value due to market assumption changes
 
143

 
(7,086
)
 
(6,943
)
Balance, June 30, 2017
 
$
7,995

 
$
237,244

 
$
245,239

 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2016
 
$
8,909

 
$
238,164

 
$
247,073

Additions, net
 
—

 
19,514

 
19,514

Change in fair value due to scheduled payments and full-balance payoffs
 
(973
)
 
(15,288
)
 
(16,261
)
Change in fair value due to market assumption changes
 
59

 
(5,146
)
 
(5,087
)
Balance, June 30, 2017
 
$
7,995

 
$
237,244

 
$
245,239

Activity in capitalized mortgage servicing rights during the three months ended June 30, 2016 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, March 31, 2016
 
$
5,949

 
$
190,106

 
$
196,055

Additions, net
 
—

 
20,773

 
20,773

Change in fair value due to scheduled payments and full-balance payoffs
 
(730
)
 
(9,068
)
 
(9,798
)
Change in fair value due to market assumption changes
 
(1,152
)
 
(15,131
)
 
(16,283
)
Balance, June 30, 2016
 
$
4,067

 
$
186,680

 
$
190,747


 
 
Purchased
 
Originated
 
Total
Balance, Dec. 31, 2015
 
$
9,911

 
$
208,694

 
$
218,605

Additions, net
 
—

 
34,355

 
34,355

Change in fair value due to scheduled payments and full-balance payoffs
 
(1,356
)
 
(16,586
)
 
(17,942
)
Change in fair value due to market assumption changes
 
(4,488
)
 
(39,783
)
 
(44,271
)
Balance, June 30, 2016
 
$
4,067

 
$
186,680

 
$
190,747
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:
 
 
June 30,
2017
 
Dec. 31,
2016
 
June 30,
2016
Discount rate – risk-free rate plus a market premium
 
9.84%
 
10.08%
 
10.09%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.61%-15.91%
 
8.98%-16.91%
 
9.26%-42.77%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
Performing loans
 
$65-$120
 
$63 - $120
 
$63 - $120
Delinquent loans
 
$150-$500
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000-$4,250
 
$650 - $4,250
 
$650 - $4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.95%
 
1.98%
 
0.99%
Primary/secondary mortgage rate spread
 
105 bps
 
105 bps
 
115 bps
Aging Status of Mortgage Loans Serviced For Others [Table Text Block]
The aging status of our mortgage loans serviced for others by investor at June 30, 2017 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
8,083,330

 
$
48,659

 
$
12,294

 
$
27,338

 
$
8,171,621

FNMA
 
6,756,211

 
46,918

 
10,679

 
23,981

 
6,837,789

GNMA
 
6,331,439

 
170,889

 
47,335

 
16,082

 
6,565,745

Other
 
514,272

 
3,278

 
932

 
1,595

 
520,077

Total
 
$
21,685,252

 
$
269,744

 
$
71,240

 
$
68,996

 
$
22,095,232
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):
 
June 30,
 
2017
 
2016
Number of unresolved deficiency requests
206

 
211

Aggregate outstanding principal balance subject to unresolved deficiency requests
$
13,370

 
$
15,920

Unpaid principal balance subject to indemnification by the Company
5,074

 
5,519
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).
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Beginning balance
$
2,587

 
$
2,974

 
$
2,788

 
$
3,359

Provision for losses
(895
)
 
368

 
(1,094
)
 
250

Charge-offs, net
(45
)
 
(89
)
 
(47
)
 
(356
)
Ending balance
$
1,647


$
3,253


$
1,647


$
3,253