Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income
Loans	$ 14,163	$ 12,470	$ 28,335	$ 24,546
Securities held-to-maturity	8,128	9,371	15,940	17,539
Securities available-for-sale	1,143	737	2,107	1,469
Federal funds sold and interest-bearing deposits in other banks	308	97	623	293
Total interest income	23,742	22,675	47,005	43,847
Interest expense
Savings and NOW deposits	938	692	1,776	1,320
Money market accounts	781	734	1,576	1,516
Time deposits	1,394	1,207	2,752	2,363
Securities sold under agreements to repurchase	126	128	241	242
Other borrowed funds and subordinated debentures	2,247	2,200	4,554	4,285
Total interest expense	5,486	4,961	10,899	9,726
Net interest income	18,256	17,714	36,106	34,121
Provision for loan losses	350		800	200
Net interest income after provision for loan losses	17,906	17,714	35,306	33,921
Other operating income
Service charges on deposit accounts	1,962	1,934	3,899	3,847
Lockbox fees	883	888	1,672	1,676
Net gains on sales of securities	45	118	45	118
Gains on sales of mortgage loans	798	418	798	517
Other income	955	852	1,883	1,557
Total other operating income	4,643	4,210	8,297	7,715
Operating expenses
Salaries and employee benefits	10,040	9,480	19,816	18,614
Occupancy	1,551	1,517	3,130	3,122
Equipment	679	659	1,315	1,252
FDIC assessments	592	545	1,160	1,048
Other	3,426	3,565	6,549	6,268
Total operating expenses	16,288	15,766	31,970	30,304
Income before income taxes	6,261	6,158	11,633	11,332
Provision for income taxes	20	233	84	448
Net income	6,241	5,925	11,549	10,884
Class A Common Stock [Member]
Operating expenses
Net income	$ 4,902	$ 4,654	$ 9,071	$ 8,549
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	$ 1.36	$ 1.29	$ 2.52	$ 2.37
Diluted earnings per share	$ 1.12	$ 1.06	$ 2.07	$ 1.95
Class B Common Stock [Member]
Operating expenses
Net income	$ 1,339	$ 1,271	$ 2,478	$ 2,335
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	$ 0.68	$ 0.65	$ 1.26	$ 1.19
Diluted earnings per share	$ 0.68	$ 0.65	$ 1.26	$ 1.19