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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Tax Rate Reconciliation
Income Tax Rate Reconciliation
 
Three Months Ended March 31,
 
2019
2018
Tax provision at U.S. federal statutory rate
$
163

$
109

Tax-exempt interest
(15
)
(17
)
Executive compensation
4

4

Stock-based compensation
(3
)
(2
)
Tax Reform

(3
)
Other
(4
)

Provision for income taxes
$
145

$
91

Roll-forward of Unrecognized Tax Benefits
Rollforward of Unrecognized Tax Benefits
 
Three Months Ended March 31,
 
2019
2018
Balance, beginning of period
$
14

$
9

Gross increases - tax positions in prior period


Gross decreases - tax positions in prior period


Balance, end of period
$
14

$
9