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Income Tax (Tables)
 3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Summary of differences between income taxes at federal statutory tax rate and effective tax rate The following table summarizes the major components creating differences between income taxes at the federal statutory and the effective tax rate recorded in the consolidated statements of income for the three months ended March 31, 2019 and 2018:

Three Months Ended
March 31,
 
2019

2018
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 
Federal statutory income tax at 21%
$
9,609


$
9,091

Tax-exempt interest income
(2,267
)

(2,015
)
Share-based compensation
(350
)

(441
)
Tax-exempt earnings and gains on life insurance
(207
)

(247
)
Tax credits
(78
)

39

Other
234


184

Actual Tax Expense
$
6,941


$
6,611







Effective Tax Rate
15.2
%

15.3
%