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Federal Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Statutory tax rate
 
21
%
 
35

 
21

 
35

Tax at statutory rate
 
$
14,097

 
23,560

 
33,513

 
67,836

Tax-advantaged interest
 
(1,338
)
 
(2,915
)
 
(4,242
)
 
(8,479
)
Dividends received deduction
 
(107
)
 
(382
)
 
(443
)
 
(1,338
)
Stock-based compensation
 
(415
)
 
(86
)
 
(2,963
)
 
(3,409
)
Other
 
(542
)
 
420

 
542

 
624

Federal income tax expense
 
$
11,695

 
20,597

 
26,407

 
55,234