Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Loans	$ 16,910	$ 14,163	$ 32,010	$ 28,335
Securities held-to-maturity	9,824	8,128	19,359	15,940
Securities available-for-sale	1,723	1,143	3,334	2,107
Federal funds sold and interest-bearing deposits in other banks	349	308	742	623
Total interest income	28,806	23,742	55,445	47,005
Interest expense
Savings and NOW deposits	1,500	938	2,727	1,776
Money market accounts	1,234	781	2,508	1,576
Time deposits	1,902	1,394	3,553	2,752
Securities sold under agreements to repurchase	120	126	223	241
Other borrowed funds and subordinated debentures	1,945	2,247	3,873	4,554
Total interest expense	6,701	5,486	12,884	10,899
Net interest income	22,105	18,256	42,561	36,106
Provision for loan losses	490	350	890	800
Net interest income after provision for loan losses	21,615	17,906	41,671	35,306
Other operating income
Service charges on deposit accounts	2,074	1,962	4,090	3,899
Lockbox fees	861	883	1,632	1,672
Net gains on sales of securities		45		45
Gains on sales of mortgage loans	269	798	370	798
Other income	1,087	955	2,108	1,883
Total other operating income	4,291	4,643	8,200	8,297
Operating expenses
Salaries and employee benefits	10,719	10,040	21,862	19,816
Occupancy	1,495	1,551	3,236	3,130
Equipment	757	679	1,463	1,315
FDIC assessments	440	592	878	1,160
Other	3,786	3,426	7,483	6,549
Total operating expenses	17,197	16,288	34,922	31,970
Income before income taxes	8,709	6,261	14,949	11,633
Provision for income taxes	552	20	696	84
Net income	$ 8,157	$ 6,241	$ 14,253	$ 11,549
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,603,729	3,600,729	3,602,229	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	$ 1.78	$ 1.36	$ 3.11	$ 2.52
Diluted earnings per share	$ 1.47	$ 1.12	$ 2.56	$ 2.07
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,964,180	1,967,180	1,965,680	1,967,180
Weighted average number of shares outstanding, diluted	1,964,180	1,967,180	1,965,680	1,967,180
Basic earnings per share	$ 0.89	$ 0.68	$ 1.55	$ 1.26
Diluted earnings per share	$ 0.89	$ 0.68	$ 1.55	$ 1.26