Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income
Loans	$ 15,045	$ 14,051	$ 43,380	$ 38,597
Securities held-to-maturity	8,238	8,834	24,178	26,373
Securities available-for-sale	1,439	830	3,546	2,299
Federal funds sold and interest-bearing deposits in other banks	283	35	906	328
Total interest income	25,005	23,750	72,010	67,597
Interest expense
Savings and NOW deposits	1,083	729	2,859	2,049
Money market accounts	909	760	2,485	2,276
Time deposits	1,464	1,231	4,216	3,594
Securities sold under agreements to repurchase	122	129	363	371
Other borrowed funds and subordinated debentures	2,213	2,285	6,767	6,570
Total interest expense	5,791	5,134	16,690	14,860
Net interest income	19,214	18,616	55,320	52,737
Provision for loan losses	375		1,175	200
Net interest income after provision for loan losses	18,839	18,616	54,145	52,537
Other operating income
Service charges on deposit accounts	1,983	1,941	5,882	5,788
Lockbox fees	759	782	2,431	2,458
Net gains on sales of securities	19	52	64	170
Gains on sales of mortgage loans	533	225	1,331	742
Other income	931	830	2,814	2,387
Total other operating income	4,225	3,830	12,522	11,545
Operating expenses
Salaries and employee benefits	10,544	10,087	30,360	28,701
Occupancy	1,509	1,499	4,639	4,621
Equipment	772	697	2,087	1,949
FDIC assessments	343	554	1,503	1,602
Other	3,462	3,263	10,012	9,531
Total operating expenses	16,630	16,100	48,601	46,404
Income before income taxes	6,434	6,346	18,066	17,678
Provision for income taxes	(52)	180	32	628
Net income	6,486	6,166	18,034	17,050
Class A Common Stock [Member]
Operating expenses
Net income	$ 5,094	$ 4,843	$ 14,165	$ 13,392
Share data:
Weighted average number of shares outstanding, basic	3,600,729	3,600,729	3,600,729	3,600,729
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909
Basic earnings per share	$ 1.41	$ 1.35	$ 3.93	$ 3.72
Diluted earnings per share	$ 1.16	$ 1.11	$ 3.24	$ 3.06
Class B Common Stock [Member]
Operating expenses
Net income	$ 1,392	$ 1,323	$ 3,869	$ 3,658
Share data:
Weighted average number of shares outstanding, basic	1,967,180	1,967,180	1,967,180	1,967,180
Weighted average number of shares outstanding, diluted	1,967,180	1,967,180	1,967,180	1,967,180
Basic earnings per share	$ 0.71	$ 0.67	$ 1.97	$ 1.86
Diluted earnings per share	$ 0.71	$ 0.67	$ 1.97	$ 1.86