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Federal Income Taxes Federal Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Quarter ended March 31,
($ in thousands)
 
2018
 
2017
Statutory tax rate
 
21
%
 
35

Tax at statutory rate
 
$
4,185

 
23,651

Tax-advantaged interest
 
(1,511
)
 
(2,807
)
Dividends received deduction
 
(126
)
 
(331
)
Stock-based compensation
 
(2,466
)
 
(2,949
)
Other
 
924

 
(430
)
Federal income tax expense
 
$
1,006

 
17,134