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Income Tax (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017:

Three Months Ended
September 30,

Nine Months Ended
September 30,
 
2018

2017

2018

2017
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 

 

 
Federal statutory income tax at 21% for 2018 and 35% for 2017
$
10,414


$
11,304


$
29,500


$
32,900

Tax-exempt interest income
(2,118
)

(2,881
)

(6,178
)

(8,062
)
Share-based compensation
(38
)

(78
)

(570
)

(862
)
Tax-exempt earnings and gains on life insurance
(197
)

(551
)

(655
)

(1,905
)
Tax credits
(42
)

(61
)

(65
)

(249
)
Other
459


206


1,018


492

Actual Tax Expense
$
8,478


$
7,939


$
23,050


$
22,314













Effective Tax Rate
17.1
%

24.6
%

16.4
%

23.7
%