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Retirement and Compensation Plans Stock based compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Stock Option Activity
 
 
 
 
 
 
 
 
Number of Shares
 
Weighted-Average
Exercise Price
per Share
 
Weighted-Average
Remaining
Contractual
Term (in
Years)
 
Aggregate
Intrinsic
Value (1)
 
(Dollars in thousands, except per share data)
Shares under option at January 1, 2019
11,176

 
$
25.11

 
 
 
 
Exercised
(4,480
)
 
25.70

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Shares under option at December 31, 2019
6,696

 
24.71

 
0.61

 
$
229

 
 
 
 
 
 
 
 
Vested at December 31, 2019
6,696

 
$
24.71

 
0.61

 
$
229

Exercisable options at December 31, 2019
6,696

 
$
24.71

 
0.61

 
$
229


(1)
Represents the difference between the share price and exercise price for each option, excluding options for which the exercise price is above the share price, at December 31, 2019.
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Restricted Stock Unit Activity
 
 
 
 
Number of Units
 
Weighted-Average Grant-Date Fair Value
per Unit
Restricted stock units at January 1, 2019
77,191

 
$
60.76

Granted
23,982

 
70.88

Vested
(30,806
)
 
53.85

Forfeited or canceled
(6,350
)
 
66.56

Restricted stock units at December 31, 2019
64,017

 
67.30