Earnings per share ("EPS") (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of Basic EPS and Diluted EPS

The following table is a reconciliation of basic EPS and diluted EPS:

Year Ended December 31,	2016		2015		2014
(in thousands except share and per share data)
BASIC EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Denominator:
Weighted average shares outstanding, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Basic EPS, Class A	$	5.35	$	5.02	$	4.78
Basic EPS, Class B	$	2.68	$	2.51	$	2.39
DILUTED EPS COMPUTATION
Numerator:
Net income, Class A	$	19,270	$	18,081	$	17,157
Net income, Class B		5,264		4,940		4,703
Total net income, for diluted EPS, Class A computation		24,534		23,021		21,860
Denominator:
Weighted average shares outstanding, basic, Class A		3,600,729		3,600,729		3,591,732
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Dilutive effect of Class A stock options		—		—		1,447
Weighted average shares outstanding diluted, Class A		5,567,909		5,567,909		5,562,209
Weighted average shares outstanding, Class B		1,967,180		1,967,180		1,969,030
Diluted EPS, Class A	$	4.41	$	4.13	$	3.93
Diluted EPS, Class B	$	2.68	$	2.51	$	2.39