Supplementary Financial Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplementary Financial Information (unaudited)
Total revenues	$ 131,900	$ 127,558	$ 139,293	$ 132,050	$ 121,534	$ 119,617	$ 126,910	$ 136,375	$ 530,801	$ 504,436	$ 572,037
Expenses:
Compensation and employee benefits	50,839	49,664	51,202	49,549	47,100	47,135	49,540	52,587	201,254	196,362	219,307
Transaction processing	19,971	19,790	22,499	21,532	19,965	19,336	19,649	22,223	83,792	81,173	91,602
Occupancy and equipment	15,940	15,821	20,720	16,541	16,892	16,033	15,063	14,649	69,022	62,637	60,191
Telecommunications and data processing services	13,142	12,649	13,718	14,098	15,037	15,034	14,712	15,067	53,607	59,850	58,460
Other general and administrative	20,544	18,351	19,760	18,776	21,049	21,220	23,597	22,677	77,431	88,543	90,808
Goodwill and other asset impairment							274,285		101	274,285	229,317
Restructuring charges			(75)		9,499				(75)	9,499	24,432
Interest expense	821	593	699	602	562	678	624	678	2,715	2,542	2,025
Total expenses	121,257	116,868	128,523	121,098	130,104	119,436	397,470	127,881	487,746	774,891	778,665
Income (loss) before income tax expense (benefit)	10,643	10,690	10,770	10,952	(8,570)	181	(270,560)	8,494	43,055	(270,455)	(206,628)
Income tax expense (benefit)	981	2,975	5,684	2,330	(2,117)	(51)	(23,464)	3,036	11,970	(22,596)	(26,839)
Net income (loss)	$ 9,662	$ 7,715	$ 5,086	$ 8,622	$ (6,453)	$ 232	$ (247,096)	$ 5,458	$ 31,085	$ (247,859)	$ (179,789)
Basic earnings (loss) per share (in dollars per share)	$ 0.27	$ 0.21	$ 0.14	$ 0.23	$ (0.17)	$ 0.01	$ (6.40)	$ 0.14	$ 0.84	$ (6.45)	$ (4.42)
Diluted earnings (loss) per share (in dollars per share)	$ 0.26	$ 0.20	$ 0.13	$ 0.22	$ (0.17)	$ 0.01	$ (6.40)	$ 0.14	$ 0.82	$ (6.45)	$ (4.42)
Basic weighted average number of common shares outstanding (in shares)	36,287	36,544	36,956	37,378	37,709	38,301	38,607	39,112	36,788	38,418	40,691
Diluted weighted average number of common shares outstanding (in shares)	37,685	37,781	38,000	38,615	37,709	39,252	38,607	40,303	38,114	38,418	40,691