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Income Tax (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017 and 2016:

Three Months Ended
September 30,
Nine Months Ended
September 30,
 
2017

2016
2017

2016
Reconciliation of Federal Statutory to Actual Tax Expense:
 

 
 

 
Federal statutory income tax at 35%
$
11,304


$
9,985

$
32,900


$
27,481

Tax-exempt interest income
(2,881
)

(2,198
)
(8,062
)

(6,328
)
Share-based compensation
(78
)

(29
)
(862
)

(10
)
Tax-exempt earnings and gains on life insurance
(551
)

(216
)
(1,905
)

(1,186
)
Tax credits
(132
)

(165
)
(396
)

(423
)
Other
277


92

639


225

Actual Tax Expense
$
7,939


$
7,469

$
22,314


$
19,759












Effective Tax Rate
24.6
%

26.2
%
23.7
%

25.2
%