Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income
Loans	$ 14,051	$ 12,708	$ 38,597	$ 37,768
Securities held-to-maturity	8,834	8,104	26,373	23,904
Securities available-for-sale	830	752	2,299	2,366
Federal funds sold and interest-bearing deposits in other banks	35	60	328	271
Total interest income	23,750	21,624	67,597	64,309
Interest expense
Savings and NOW deposits	729	642	2,049	1,911
Money market accounts	760	725	2,276	2,033
Time deposits	1,231	1,089	3,594	3,315
Securities sold under agreements to repurchase	129	90	371	284
Other borrowed funds and subordinated debentures	2,285	2,333	6,570	6,753
Total interest expense	5,134	4,879	14,860	14,296
Net interest income	18,616	16,745	52,737	50,013
Provision for loan losses		600	200	1,650
Net interest income after provision for loan losses	18,616	16,145	52,537	48,363
Other operating income
Service charges on deposit accounts	1,941	2,022	5,788	6,068
Lockbox fees	782	723	2,458	2,345
Net gains on sales of securities	52		170
Gains on sales of mortgage loans	225	133	742	221
Other income	830	880	2,387	2,209
Total other operating income	3,830	3,758	11,545	10,843
Operating expenses
Salaries and employee benefits	10,087	8,681	28,701	26,332
Occupancy	1,499	1,341	4,621	4,105
Equipment	697	552	1,949	1,709
FDIC assessments	554	502	1,602	1,476
Other	3,263	2,900	9,531	8,602
Total operating expenses	16,100	13,976	46,404	42,224
Income before income taxes	6,346	5,927	17,678	16,982
Provision for income taxes	180	221	628	745
Net income	6,166	5,706	17,050	16,237
Class A Common Stock [Member]
Operating expenses
Net income	$ 4,843	$ 4,480	$ 13,392	$ 12,741
Share data:
Weighted average number of shares outstanding, basic	3,600,729	3,594,583	3,600,729	3,588,728
Weighted average number of shares outstanding, diluted	5,567,909	5,563,278	5,567,909	5,559,909
Basic earnings per share	$ 1.35	$ 1.25	$ 3.72	$ 3.55
Diluted earnings per share	$ 1.11	$ 1.03	$ 3.06	$ 2.92
Class B Common Stock [Member]
Operating expenses
Net income	$ 1,323	$ 1,226	$ 3,658	$ 3,496
Share data:
Weighted average number of shares outstanding, basic	1,967,180	1,967,180	1,967,180	1,969,647
Weighted average number of shares outstanding, diluted	1,967,180	1,967,180	1,967,180	1,969,647
Basic earnings per share	$ 0.67	$ 0.62	$ 1.86	$ 1.78
Diluted earnings per share	$ 0.67	$ 0.62	$ 1.86	$ 1.78