Summary of Significant Accounting Policies - EPS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net earnings per common share - basic and diluted:
Net earnings	$ 796,000	$ 631,000	$ 557,000	$ 279,000
Allocation to nonvested restricted stock awards	20,000	15,000	14,000	7,000
Net earnings available to common stockholders	$ 776,000	$ 616,000	$ 543,000	$ 272,000
Weighted-average shares outstanding - basic and diluted	32,202,000	32,086,000	32,200,000	32,084,000
Net earnings per common share - basic and diluted	$ 0.02	$ 0.02	$ 0.02	$ 0.01
Options outstanding (in shares)	0	0	0	0
Dividends paid	$ 0	$ 0	$ 0	$ 0
Accounting for stock-based compensation
Stock-based compensation expense for restricted stock awards	74,000	90,000	177,000	195,000
Income tax benefit (expense) related to restricted stock awards	$ 30,000	$ 36,000	$ (47,000)	$ (93,000)