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Income Tax (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:

Three Months Ended
March 31,
 
2017

2016
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 
Federal statutory income tax at 35%
$
10,627


$
8,143

Tax-exempt interest income
(2,549
)

(2,026
)
Share-based compensation
(755
)

2

Earnings on life insurance
(314
)

(517
)
Tax credits
(132
)

(129
)
Other
291


101

Actual Tax Expense
$
7,168


$
5,574







Effective Tax Rate
23.6
%

24.0
%