Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income
Loans	$ 12,856	$ 14,494	$ 36,734	$ 39,114
Securities held-to-maturity	6,181	1,744	9,120	5,131
Securities available-for-sale	1,392	5,671	12,580	17,054
Federal funds sold and interest-bearing deposits in other banks	120	170	384	457
Total interest income	20,549	22,079	58,818	61,756
Interest expense
Savings and NOW deposits	674	562	1,933	1,649
Money market accounts	681	603	1,795	1,833
Time deposits	1,089	1,493	3,657	4,774
Securities sold under agreements to repurchase	89	94	268	274
Other borrowed funds and subordinated debentures	2,218	2,107	6,310	6,215
Total interest expense	4,751	4,859	13,963	14,745
Net interest income	15,798	17,220	44,855	47,011
Provision for loan losses	750	1,250	2,250	3,250
Net interest income after provision for loan losses	15,048	15,970	42,605	43,761
Other operating income
Service charges on deposit accounts	2,064	1,977	6,040	5,887
Lockbox fees	736	745	2,346	2,225
Net gains on sales of investments	1,001	529	2,665	1,119
Gains on sales of mortgage loans held for sale	247	166	1,238	296
Other income	726	688	2,140	2,185
Total other operating income	4,774	4,105	14,429	11,712
Operating expenses
Salaries and employee benefits	8,858	8,400	25,858	24,732
Occupancy	1,240	1,161	3,715	3,459
Equipment	554	627	1,746	1,754
FDIC assessments	462	450	1,312	1,302
Other	2,881	3,070	8,491	8,712
Total operating expenses	13,995	13,708	41,122	39,959
Income before income taxes	5,827	6,367	15,912	15,514
Provision for income taxes	308	685	891	1,253
Net income	5,519	5,682	15,021	14,261
Class A Common Stock [Member]
Operating expenses
Net income	4,324	4,441	11,760	11,142
Share data:
Weighted average number of shares outstanding, basic	3,578,400	3,559,125	3,574,109	3,555,536
Weighted average number of shares outstanding, diluted	5,558,031	5,549,810	5,557,783	5,548,133
Basic earnings per share	$ 1.21	$ 1.25	$ 3.29	$ 3.13
Diluted earnings per share	$ 0.99	$ 1.02	$ 2.70	$ 2.57
Class B Common Stock [Member]
Operating expenses
Net income	$ 1,195	$ 1,241	$ 3,261	$ 3,119
Share data:
Weighted average number of shares outstanding, basic	1,978,180	1,989,380	1,982,413	1,991,671
Weighted average number of shares outstanding, diluted	1,978,180	1,989,380	1,982,413	1,991,671
Basic earnings per share	$ 0.60	$ 0.62	$ 1.64	$ 1.57
Diluted earnings per share	$ 0.60	$ 0.62	$ 1.64	$ 1.57