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Mortgage Banking Activities (Tables)
 9 Months Ended
Sep. 30, 2017
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
September 30, 2017
 
December 31, 2016
 
September 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
 
$
261,868

 
$
265,783

 
$
286,414

 
$
286,971

 
$
422,523

 
$
433,040

Residential mortgage loan commitments
 
334,337

 
9,066

 
318,359

 
9,733

 
630,804

 
18,598

Forward sales contracts
 
524,878

 
794

 
569,543

 
5,193

 
929,907

 
(4,046
)
 
 
 

 
$
275,643

 
 

 
$
301,897

 
 

 
$
447,592
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
12,041

 
$
23,110

 
$
32,443

 
$
47,424

Net change in unrealized gain on mortgage loans held for sale
 
(1,492
)
 
(2,518
)
 
3,335

 
4,649

Net change in the fair value of mortgage loan commitments
 
(1,927
)
 
(6,901
)
 
(667
)
 
10,464

Net change in the fair value of forward sales contracts
 
(293
)
 
8,267

 
(4,399
)
 
(4,846
)
Total production revenue
 
8,329

 
21,958

 
30,712

 
57,691

Servicing revenue
 
16,561

 
16,558

 
49,645

 
47,809

Total mortgage banking revenue
 
$
24,890

 
$
38,516

 
$
80,357

 
$
105,500
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
September 30,
2017
 
December 31, 2016
 
September 30,
2016
Number of residential mortgage loans serviced for others
 
137,359

 
139,340

 
139,587

Outstanding principal balance of residential mortgage loans serviced for others
 
$
22,063,121

 
$
21,997,568

 
$
21,851,536

Weighted average interest rate
 
3.95
%
 
3.97
%
 
4.01
%
Remaining term (in months)
 
298

 
301

 
302
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three months ended September 30, 2017 was as follows (in thousands):
 
 
Purchased
 
Originated
 
Total
Balance, June 30, 2017
 
$
7,995

 
$
237,244

 
$
245,239

Additions, net
 
—

 
9,925

 
9,925

Change in fair value due to principal payments
 
(470
)
 
(8,197
)
 
(8,667
)
Change in fair value due to market assumption changes
 
303

 
(942
)
 
(639
)
Balance, September 30, 2017
 
$
7,828

 
$
238,030

 
$
245,858

 
 
Purchased
 
Originated
 
Total
Balance, December 31, 2016
 
$
8,909

 
$
238,164

 
$
247,073

Additions, net
 
—

 
29,439

 
29,439

Change in fair value due to principal payments
 
(1,443
)
 
(23,485
)
 
(24,928
)
Change in fair value due to market assumption changes
 
362

 
(6,088
)
 
(5,726
)
Balance, September 30, 2017
 
$
7,828

 
$
238,030

 
$
245,858

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, September 30, 2016
 
$
3,565

 
$
200,056

 
$
203,621


 
 
Purchased
 
Originated
 
Total
Balance, December 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, September 30, 2016
 
$
3,565

 
$
200,056

 
$
203,621
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,
2017
 
December 31, 2016
 
September 30,
2016
Discount rate – risk-free rate plus a market premium
 
9.84%
 
10.08%
 
10.08%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.71%-15.43%
 
8.98%-16.91%
 
9.16%-47.15%
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
 
2.00%
 
1.98%
 
1.18%
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 September 30, 2017 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
8,021,016

 
$
78,542

 
$
13,100

 
$
26,171

 
$
8,138,829

FNMA
 
6,635,428

 
76,065

 
10,398

 
20,596

 
6,742,487

GNMA
 
6,376,127

 
215,506

 
59,659

 
20,925

 
6,672,217

Other
 
502,768

 
3,492

 
1,167

 
2,161

 
509,588

Total
 
$
21,535,339

 
$
373,605

 
$
84,324

 
$
69,853

 
$
22,063,121