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Mortgage Banking Activities (Tables)
 6 Months Ended
Jun. 30, 2018
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
June 30, 2018
 
December 31, 2017
 
June 30, 2017
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid
Principal
 Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
214,717

 
$
216,983

 
$
212,525

 
$
215,113

 
$
269,772

 
$
275,179

Residential mortgage loan commitments
 
251,231

 
7,473

 
222,919

 
6,523

 
362,088

 
10,993

Forward sales contracts
 
440,735

 
(1,155
)
 
380,159

 
(258
)
 
587,595

 
1,087

 
 
 

 
$
223,301

 
 

 
$
221,378

 
 

 
$
287,259
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
10,718

 
$
11,787

 
$
19,636

 
$
20,402

Net change in unrealized gain on mortgage loans held for sale
 
1,047

 
985

 
(322
)
 
4,827

Net change in the fair value of mortgage loan commitments
 
(1,124
)
 
(3,274
)
 
950

 
1,260

Net change in the fair value of forward sales contracts
 
(726
)
 
4,342

 
(897
)
 
(4,106
)
Total production revenue
 
9,915

 
13,840

 
19,367

 
22,383

Servicing revenue
 
16,431

 
16,436

 
33,004

 
33,084

Total mortgage banking revenue
 
$
26,346

 
$
30,276

 
$
52,371

 
$
55,467
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
June 30,
2018
 
December 31, 2017
 
June 30,
2017
Number of residential mortgage loans serviced for others
 
134,868

 
136,528

 
138,335

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,963,309

 
$
22,046,632

 
$
22,095,232

Weighted average interest rate
 
3.96
%
 
3.94
%
 
3.95
%
Remaining term (in months)
 
295

 
297

 
299
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
The following represents activity in capitalized mortgage servicing rights (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Beginning Balance
$
274,978

 
$
249,403

 
$
252,867

 
$
247,073

Additions, net
10,820

 
11,078

 
19,720

 
19,514

Change in fair value due to principal payments
(8,802
)
 
(8,299
)
 
(16,797
)
 
(16,261
)
Change in fair value due to market assumption changes
1,723

 
(6,943
)
 
22,929

 
(5,087
)
Ending Balance
$
278,719

 
$
245,239

 
$
278,719

 
$
245,239
Assumptions to Value Mortgage Servicing Rights [Table Text Block]

Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant market assumptions used to determine fair value based on significant unobservable inputs were as follows:
 
 
June 30,
2018
 
December 31, 2017
 
June 30,
2017
Discount rate – risk-free rate plus a market premium
 
9.91%
 
9.84%
 
9.84%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.12% - 15.08%
 
8.72% - 15.16%
 
8.61%-15.91%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
Performing loans
 
$65 - $88
 
$65 - $88
 
$65-$120
Delinquent loans
 
$150 - $500
 
$150 - $500
 
$150-$500
Loans in foreclosure
 
$1,000 - $4,000
 
$1,000 - $4,000
 
$1,000-$4,250
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
2.88%
 
2.24%
 
1.95%
Primary/secondary mortgage rate spread
 
105 bps
 
105 bps
 
105 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, 2018 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
7,932,832

 
$
68,996

 
$
9,405

 
$
25,129

 
$
8,036,362

FNMA
 
6,491,492

 
77,424

 
9,118

 
20,918

 
6,598,952

GNMA
 
6,624,862

 
198,852

 
47,791

 
15,204

 
6,886,709

Other
 
433,830

 
4,989

 
221

 
2,246

 
441,286

Total
 
$
21,483,016

 
$
350,261

 
$
66,535

 
$
63,497

 
$
21,963,309