CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fee Revenue and Other Income:
Information services payment and processing revenue	$ 83,713	$ 78,622	$ 77,427
Bank service fees	1,276	1,223	1,132
Gains on sales of securities	387	2,910	23
Other	760	613	1,325
Total fee revenue and other income	86,136	83,368	79,907
Interest Income:
Interest and fees on loans	29,063	28,669	29,726
Interest and dividends on securities:
Taxable	143	38	29
Exempt from federal income taxes	9,658	9,460	9,412
Interest on federal funds sold and other short-term investments	1,066	543	592
Total interest income	39,930	38,710	39,759
Interest Expense:
Interest on deposits	2,029	2,111	2,460
Total interest expense	2,029	2,111	2,460
Net interest income	37,901	36,599	37,299
Provision for loan losses	(1,500)	(850)
Net interest income after provision for loan losses	39,401	37,449	37,299
Total net revenue	125,537	120,817	117,206
Operating Expense:
Personnel	72,581	70,314	66,100
Occupancy	3,390	3,400	3,172
Equipment	4,451	4,291	4,130
Amortization of intangible assets	408	408	483
Other operating	12,643	11,370	11,529
Total operating expense	93,473	89,783	85,414
Income before income tax expense	32,064	31,034	31,792
Income tax expense	7,716	7,978	7,759
Net income	$ 24,348	$ 23,056	$ 24,033
Basic Earnings Per Share	$ 2.18	$ 2.03	$ 2.09
Diluted Earnings Per Share	$ 2.15	$ 2.00	$ 2.06