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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
December 31, 2018
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
175,117

 
$
177,703

 
$
145,057

 
$
146,971

Residential mortgage loan commitments
 
158,460

 
5,233

 
160,848

 
5,378

Forward sales contracts
 
315,203

 
(665
)
 
274,000

 
(3,128
)
 
 
 

 
$
182,271

 
 

 
$
149,221
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 
 
Year Ended
 
 
2019
 
2018
 
2017
Production revenue:
 
 
 
 
 
 
Net realized gains on sales of mortgage loans
 
$
39,730

 
$
36,379

 
$
45,128

Net change in unrealized gain on mortgage loans held for sale
 
672

 
(674
)
 
2,031

Net change in the fair value of mortgage loan commitments
 
(145
)
 
(1,145
)
 
(3,210
)
Net change in the fair value of forward sales contracts
 
2,463

 
(2,870
)
 
(5,451
)
Total mortgage production revenue
 
42,720

 
31,690

 
38,498

Servicing revenue
 
64,821

 
66,097

 
66,221

Total mortgage banking revenue
 
$
107,541

 
$
97,787

 
$
104,719
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
 
 
December 31,
 
 
2019
 
2018
 
2017
Number of residential mortgage loans serviced for others
 
126,828

 
132,463

 
136,528

Outstanding principal balance of residential mortgage loans serviced for others
 
$
20,727,106

 
$
21,658,335

 
$
22,046,632

Weighted average interest rate
 
3.98
%
 
3.99
%
 
3.94
%
Remaining contractual term (in months)
 
289

 
293

 
297
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]

Activity in capitalized mortgage servicing rights during the three years ended December 31, 2019 is as follows (in thousands):
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

Additions, net
 
35,128

Change in fair value due to loan runoff
 
(38,979
)
Change in fair value due to market changes
 
(53,517
)
Balance, December 31, 2019
 
$
201,886
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,
 
 
2019
 
2018
Discount rate – risk-free rate plus a market premium
 
9.81%
 
9.90%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.28% - 16.05%
 
8.05% - 15.74%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$68 - $94
 
$67 - $93
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000 - $4,000
 
$1,000 - $4,000
Primary/secondary mortgage rate spread
 
104 bps
 
105 bps
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.73%
 
2.57%
Delinquency rate
 
2.73%
 
2.74%