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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2019
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
March 31, 2019
 
December 31, 2018
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
153,818

 
$
155,679

 
$
145,057

 
$
146,971

Residential mortgage loan commitments
 
263,434

 
8,091

 
160,848

 
5,378

Forward sales contracts
 
376,411

 
(3,613
)
 
274,000

 
(3,128
)
 
 
 

 
$
160,157

 
 

 
$
149,221
Mortgage Banking Revenue [Table Text Block] Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
March 31,
 
 
2019
 
2018
Production revenue:
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
5,693

 
$
8,918

Net change in unrealized gain on mortgage loans held for sale
 
(53
)
 
(1,369
)
Net change in the fair value of mortgage loan commitments
 
2,713

 
2,074

Net change in the fair value of forward sales contracts
 
(485
)
 
(171
)
Total production revenue
 
7,868

 
9,452

Servicing revenue
 
15,966

 
16,573

Total mortgage banking revenue
 
$
23,834

 
$
26,025
Summary of Mortgage Servicing Rights [Table Text Block] The following represents a summary of mortgage servicing rights (dollars in thousands):
 
 
March 31, 2019
 
December 31, 2018
Number of residential mortgage loans serviced for others
 
131,636,000

 
132,463,000

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,544,295

 
$
21,658,335

Weighted average interest rate
 
4.00
%
 
3.99
%
Remaining term (in months)
 
292

 
293
Activity in Capitalized Mortgage Servicing Rights [Table Text Block] The following represents activity in capitalized mortgage servicing rights (in thousands):
 
 
Three Months Ended
March 31,
 
 
2019
 
2018
Beginning Balance
 
$
259,254

 
$
252,867

Additions, net
 
6,188

 
8,900

Change in fair value due to principal payments
 
(6,583
)
 
(7,995
)
Change in fair value due to market assumption changes
 
(20,666
)
 
21,206

Ending Balance
 
$
238,193

 
$
274,978
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:
 
 
March 31, 2019
 
December 31, 2018
Discount rate – risk-free rate plus a market premium
 
9.83%
 
9.90%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.14% - 16.02%
 
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
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
2.29%
 
2.57%
Primary/secondary mortgage rate spread
 
105 bps
 
105 bps