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Mortgage Banking Activities (Tables)
 9 Months Ended
Sep. 30, 2018
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
September 30, 2018
 
December 31, 2017
 
September 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
 
$
169,095

 
$
169,226

 
$
212,525

 
$
215,113

 
$
261,868

 
$
265,783

Residential mortgage loan commitments
 
197,752

 
5,027

 
222,919

 
6,523

 
334,337

 
9,066

Forward sales contracts
 
330,876

 
1,613

 
380,159

 
(258
)
 
524,878

 
794

 
 
 

 
$
175,866

 
 

 
$
221,378

 
 

 
$
275,643
Mortgage Banking Revenue [Table Text Block] Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
9,063

 
$
12,041

 
$
28,699

 
$
32,443

Net change in unrealized gain on mortgage loans held for sale
 
(2,135
)
 
(1,492
)
 
(2,457
)
 
3,335

Net change in the fair value of mortgage loan commitments
 
(2,446
)
 
(1,927
)
 
(1,496
)
 
(667
)
Net change in the fair value of forward sales contracts
 
2,768

 
(293
)
 
1,871

 
(4,399
)
Total production revenue
 
7,250

 
8,329

 
26,617

 
30,712

Servicing revenue
 
16,286

 
16,561

 
49,290

 
49,645

Total mortgage banking revenue
 
$
23,536

 
$
24,890

 
$
75,907

 
$
80,357
Summary of Mortgage Servicing Rights [Table Text Block] The following represents a summary of mortgage servicing rights (dollars in thousands):
 
 
September 30,
2018
 
December 31, 2017
 
September 30,
2017
Number of residential mortgage loans serviced for others
 
133,538

 
136,528

 
137,359

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,826,773

 
$
22,046,632

 
$
22,063,121

Weighted average interest rate
 
3.97
%
 
3.94
%
 
3.95
%
Remaining term (in months)
 
295

 
297

 
298
Activity in Capitalized Mortgage Servicing Rights [Table Text Block] The following represents activity in capitalized mortgage servicing rights (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Beginning Balance
$
278,719

 
$
245,239

 
$
252,867

 
$
247,073

Additions, net
8,968

 
9,925

 
28,688

 
29,439

Change in fair value due to principal payments
(8,986
)
 
(8,667
)
 
(25,783
)
 
(24,928
)
Change in fair value due to market assumption changes
5,972

 
(639
)
 
28,901

 
(5,726
)
Ending Balance
$
284,673

 
$
245,858

 
$
284,673

 
$
245,858
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:
 
 
September 30,
2018
 
December 31, 2017
 
September 30,
2017
Discount rate – risk-free rate plus a market premium
 
9.95%
 
9.84%
 
9.84%
Prepayment rate - based upon loan interest rate, original term and loan type
 
7.85%-15.04%
 
8.72%-15.16%
 
8.71%-15.43%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
 
 
Performing loans
 
$66-$92
 
$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
 
3.07%
 
2.24%
 
2.00%
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 September 30, 2018 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
7,804,568

 
$
84,339

 
$
14,825

 
$
22,326

 
$
7,926,058

FNMA
 
6,495,003

 
91,699

 
14,698

 
17,281

 
6,618,681

GNMA
 
6,569,093

 
245,827

 
54,429

 
16,867

 
6,886,216

Other
 
388,107

 
5,290

 
529

 
1,892

 
395,818

Total
 
$
21,256,771

 
$
427,155

 
$
84,481

 
$
58,366

 
$
21,826,773