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Income Tax (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2017 and 2016:

Three Months Ended
June 30,
Six Months Ended
June 30,
 
2017

2016
2017

2016
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 
 

 
Federal statutory income tax at 35%
$
10,970


$
9,353

$
21,596


$
17,496

Tax-exempt interest income
(2,632
)

(2,104
)
(5,181
)

(4,130
)
Share-based compensation
(29
)

17

(784
)

19

Tax-exempt earnings and gains on life insurance
(1,040
)

(453
)
(1,354
)

(970
)
Tax credits
(132
)

(129
)
(264
)

(258
)
Other
70


32

362


133

Actual Tax Expense
$
7,207


$
6,716

$
14,375


$
12,290












Effective Tax Rate
23.0
%

25.1
%
23.3
%

24.6
%