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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
December 31, 2017
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
145,057

 
$
146,971

 
$
212,525

 
$
215,113

Residential mortgage loan commitments
 
160,848

 
5,378

 
222,919

 
6,523

Forward sales contracts
 
274,000

 
(3,128
)
 
380,159

 
(258
)
 
 
 

 
$
149,221

 
 

 
$
221,378
Mortgage Banking Revenue [Table Text Block] Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended
 
 
2018
 
2017
 
2016
Production revenue:
 
 
 
 
 
 
Net realized gains on sales of mortgage loans
 
$
36,379

 
$
45,128

 
$
68,947

Net change in unrealized gain on mortgage loans held for sale
 
(674
)
 
2,031

 
(5,311
)
Net change in the fair value of mortgage loan commitments
 
(1,145
)
 
(3,210
)
 
1,599

Net change in the fair value of forward sales contracts
 
(2,870
)
 
(5,451
)
 
4,393

Total mortgage production revenue
 
31,690

 
38,498

 
69,628

Servicing revenue
 
66,097

 
66,221

 
64,286

Total mortgage banking revenue
 
$
97,787

 
$
104,719

 
$
133,914
Summary of Mortgage Servicing Rights [Table Text Block] The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
December 31,
 
 
2018
 
2017
 
2016
Number of residential mortgage loans serviced for others
 
132,463,000

 
136,528,000

 
139,340,000

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,658,335

 
$
22,046,632

 
$
21,997,568

Weighted average interest rate
 
3.99
%
 
3.94
%
 
3.97
%
Remaining contractual term (in months)
 
293

 
297

 
301
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three years ended December 31, 2018 is as follows (in thousands):
Balance, December 31, 2015
 
$
218,605

Additions, net
 
71,405

Change in fair value due to loan runoff
 
(40,744
)
Change in fair value due to market changes
 
(2,193
)
Balance, December 31, 2016
 
247,073

Additions, net
 
39,149

Change in fair value due to loan runoff
 
(33,527
)
Change in fair value due to market changes
 
172

Balance, December 31, 2017
 
252,867

Additions, net
 
35,247

Change in fair value due to loan runoff
 
(33,528
)
Change in fair value due to market changes
 
4,668

Balance, December 31, 2018
 
$
259,254
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,
 
 
2018
 
2017
Discount rate – risk-free rate plus a market premium
 
9.90%
 
9.84%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.05% - 15.74%
 
8.72%-15.16%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$67 - $93
 
$65 - $88
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000 - $4,000
 
$1,000 - $4,000
Primary/secondary mortgage rate spread
 
105 bps
 
105 bps
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
2.57%
 
2.24%
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, 2018 follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89
Days
 
90 Days or More
 
Total
FHLMC
 
$
7,798,790

 
$
58,271

 
$
11,139

 
$
25,239

 
$
7,893,439

FNMA
 
6,458,561

 
63,321

 
12,413

 
20,858

 
6,555,153

GNMA
 
6,568,459

 
200,747

 
56,024

 
15,996

 
6,841,226

Other
 
362,268

 
4,297

 
81

 
1,871

 
368,517

Total
 
$
21,188,078

 
$
326,636

 
$
79,657

 
$
63,964

 
$
21,658,335