Subordinated Debt Securities (Narrative) (Details) (Subordinated Debt [Member], USD $) In Millions, unless otherwise specified			0 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 21, 2005 Hallmark Statutory Trust I [Member]	Dec. 31, 2013 Hallmark Statutory Trust I [Member]	Aug. 23, 2007 Hallmark Statutory Trust I I [Member]	Dec. 31, 2013 Hallmark Statutory Trust I I [Member]	Jun. 21, 2005 London Interbank Offered Rate (LIBOR) [Member] Hallmark Statutory Trust I [Member]	Aug. 23, 2007 London Interbank Offered Rate (LIBOR) [Member] Hallmark Statutory Trust I I [Member]
Subordinated Borrowing [Line Items]
Long-term debt, gross	$ 56.7	$ 56.7	$ 30.9	$ 30.9	$ 25.8	$ 25.8
Debt instrument, maturity date			Jun. 15, 2035		Sep. 15, 2037
Proceeds from issuance of trust preferred securities			30.0		25.0
Proceeds from issuance of common stock			$ 0.9		$ 0.8
Subordinated borrowing, interest rate			7.725%		8.28%
Debt instrument interest rate fixed to floating date			Jun. 15, 2015		Sep. 15, 2017
Debt instrument, description of variable rate basis			interest will adjust quarterly to the three-month LIBOR rate plus 3.25 percentage points		three-month LIBOR rate plus 2.90 percentage points
Debt instrument, basis spread on variable rate							3.25%	2.90%