Basis of Presentation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended
	Mar. 31, 2014	Jun. 21, 2005 Hallmark Statutory Trust I [Member]	Aug. 23, 2007 Hallmark Statutory Trust II [Member]	Mar. 31, 2014 Subordinated Debt [Member]	Jun. 21, 2005 Subordinated Debt [Member] Hallmark Statutory Trust I [Member]	Aug. 23, 2007 Subordinated Debt [Member] Hallmark Statutory Trust II [Member]
Variable Interest Entity [Line Items]
Trust preferred securities, carrying value				$ 56.7
Trust preferred securities, fair value				51.3
Current yield to maturity percentage	9.00%			8.00%
Proceeds from issuance of trust preferred securities		30.0	25.0
Payments to acquire trust preferred investments					$ 30.9	$ 25.8