Industry Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fee revenue and other income:
Income from customers	$ 30,963	$ 30,120	$ 61,732	$ 59,913
Intersegment income (expense)
Net income	5,869	5,548	11,702	11,087
Goodwill	11,590	11,590	11,590	11,590	$ 11,590
Other intangible assets, net	2,201	2,597	2,201	2,597
Total assets	1,521,184	1,366,880	1,521,184	1,366,880	$ 1,455,506
Information Services [Member]
Fee revenue and other income:
Income from customers	24,436	24,152	47,994	48,426
Intersegment income (expense)	2,815	2,350	6,073	4,544
Net income	3,478	3,591	6,425	7,407
Goodwill	11,454	11,454	11,454	11,454
Other intangible assets, net	2,201	2,597	2,201	2,597
Total assets	777,312	709,754	777,312	709,754
Banking Services [Member]
Fee revenue and other income:
Income from customers	6,527	5,968	13,738	11,487
Intersegment income (expense)	403	433	779	856
Net income	2,391	1,957	5,277	3,680
Goodwill	136	136	136	136
Other intangible assets, net
Total assets	753,333	675,777	753,333	675,777
Corporate Eliminations and Other [Member]
Fee revenue and other income:
Income from customers
Intersegment income (expense)	(3,218)	(2,783)	(6,852)	(5,400)
Net income
Goodwill
Other intangible assets, net
Total assets	$ (9,461)	$ (18,651)	$ (9,461)	$ (18,651)