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Income Tax (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017:

Three Months Ended
March 31,
 
2018

2017
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 
Federal statutory income tax at 21% for 2018 and 35% for 2017
$
9,091


$
10,627

Tax-exempt interest income
(2,015
)

(2,549
)
Share-based compensation
(441
)

(755
)
Tax-exempt earnings and gains on life insurance
(247
)

(314
)
Tax credits
39


(106
)
Other
184


265

Actual Tax Expense
$
6,611


$
7,168







Effective Tax Rate
15.3
%

23.6
%