CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fee Revenue and Other Income:
Information services payment and processing revenue	$ 66,695	$ 60,688	$ 54,183
Bank service fees	1,272	1,354	1,410
Gains on sales of securities	2,635	43	0
Other	536	739	553
Total fee revenue and other income	71,138	62,824	56,146
Interest Income:
Interest and fees on loans	35,525	39,515	39,785
Interest and dividends on securities:
Taxable	60	41	43
Exempt from federal income taxes	9,878	9,993	8,704
Interest on federal funds sold and other short-term investments	470	686	514
Total interest income	45,933	50,235	49,046
Interest Expense:
Interest on deposits	3,148	4,374	4,875
Total interest expense	3,148	4,374	4,875
Net interest income	42,785	45,861	44,171
Provision for loan losses	2,400	2,150	4,100
Net interest income after provision for loan losses	40,385	43,711	40,071
Total net revenue	111,523	106,535	96,217
Operating Expense:
Salaries and employee benefits	62,563	56,573	51,368
Occupancy	2,157	2,318	2,485
Equipment	3,516	3,525	3,561
Amortization of intangible assets	581	107	107
Other operating	11,516	12,506	10,763
Total operating expense	80,333	75,029	68,284
Income before income tax expense	31,190	31,506	27,933
Income tax expense	7,887	8,497	7,623
Net income	$ 23,303	$ 23,009	$ 20,310
Basic Earnings Per Share (in dollars per share)	$ 2.05	$ 2.03	$ 1.8
Diluted Earnings Per Share (in dollars per share)	$ 2.02	$ 2.01	$ 1.78