Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest income
Loans	$ 11,997	$ 12,572	$ 23,878	$ 24,620
Securities held-to-maturity	1,419	1,924	2,939	3,387
Securities available-for-sale	5,571	5,668	11,188	11,383
Federal funds sold and interest-bearing deposits in other banks	145	148	264	287
Total interest income	19,132	20,312	38,269	39,677
Interest expense
Savings and NOW deposits	649	560	1,259	1,087
Money market accounts	582	618	1,114	1,230
Time deposits	1,234	1,600	2,568	3,281
Securities sold under agreements to repurchase	89	88	179	180
Other borrowed funds and subordinated debentures	2,066	2,057	4,092	4,108
Total interest expense	4,620	4,923	9,212	9,886
Net interest income	14,512	15,389	29,057	29,791
Provision for loan losses	750	900	1,500	2,000
Net interest income after provision for loan losses	13,762	14,489	27,557	27,791
Other operating income
Service charges on deposit accounts	2,034	1,922	3,976	3,910
Lockbox fees	838	781	1,610	1,480
Net gains on sales of investments	781	442	1,664	590
Gains on sales of mortgage loans held for sale	821	131	991	131
Other income	747	712	1,414	1,496
Total other operating income	5,221	3,988	9,655	7,607
Operating expenses
Salaries and employee benefits	8,382	8,191	17,000	16,332
Occupancy	1,193	1,176	2,475	2,298
Equipment	610	544	1,192	1,127
FDIC assessments	450	445	850	852
Other	3,027	3,095	5,610	5,642
Total operating expenses	13,662	13,451	27,127	26,251
Income before income taxes	5,321	5,026	10,085	9,147
Provision for income taxes	295	255	583	568
Net income	5,026	4,771	9,502	8,579
Class A Common Stock [Member]
Operating expenses
Net income	3,935	3,727	7,437	6,702
Share data:
Weighted average number of shares outstanding, basic	3,574,379	3,556,474	3,571,963	3,553,734
Weighted average number of shares outstanding, diluted	5,557,354	5,548,830	5,557,655	5,547,237
Basic earnings per share	$ 1.10	$ 1.05	$ 2.08	$ 1.89
Diluted earnings per share	$ 0.90	$ 0.86	$ 1.71	$ 1.55
Class B Common Stock [Member]
Operating expenses
Net income	$ 1,091	$ 1,044	$ 2,065	$ 1,877
Share data:
Weighted average number of shares outstanding, basic	1,982,180	1,991,880	1,984,530	1,992,818
Weighted average number of shares outstanding, diluted	1,982,180	1,991,880	1,984,530	1,992,818
Basic earnings per share	$ 0.55	$ 0.52	$ 1.04	$ 0.94
Diluted earnings per share	$ 0.55	$ 0.52	$ 1.04	$ 0.94