Industry Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fee revenue and other income:
Fee income from customers		$ 27,013	$ 25,374
Interest income	[1]	13,438	11,975
Interest expense		1,290	679
Intersegment income (expense)
Tax-equivalized pre-tax income	[1]	10,450	10,488
Goodwill		12,569	12,569	$ 12,569
Other intangible assets, net		1,446	1,885
Total assets		1,684,881	1,650,802	$ 1,695,176
Funding Sources		1,238,789	1,240,746
Information Services [Member]
Fee revenue and other income:
Fee income from customers		26,796	24,872
Interest income	[1]	6,177	6,157
Interest expense
Intersegment income (expense)
Tax-equivalized pre-tax income	[1]	7,588	7,375
Goodwill		12,433	12,433
Other intangible assets, net		1,446	1,885
Total assets		874,971	878,199
Funding Sources		647,590	644,909
Banking Services [Member]
Fee revenue and other income:
Fee income from customers		391	376
Interest income	[1]	7,486	6,895
Interest expense		1,290	679
Intersegment income (expense)		519	462
Tax-equivalized pre-tax income	[1]	3,260	4,064
Goodwill		136	136
Other intangible assets, net
Total assets		832,326	858,283
Funding Sources		591,199	595,837
Corporate Eliminations and Other [Member]
Fee revenue and other income:
Fee income from customers		(174)	126
Interest income	[1]	(225)	(1,077)
Interest expense
Intersegment income (expense)		(519)	(462)
Tax-equivalized pre-tax income	[1]	(398)	(951)
Goodwill
Other intangible assets, net
Total assets		(22,416)	(85,680)
Funding Sources

[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2019 and 2018. The tax-equivalent adjustment was approximately $541,000 and $687,000 for the three months ended March 31, 2019 and 2018, respectively.