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Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Jan. 01, 2018
USD ($)
Aug. 23, 2007
USD ($)
Jun. 21, 2005
USD ($)
Jun. 21, 2005
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Number of reportable segments | segment         3    
Deferred policy acquisition costs, additions         $ 31.1 $ 37.9 $ 32.3
Deferred policy acquisition costs, amortized         (34.3) (39.1) (32.7)
Deferred policy acquisition cost, (amortization) deferrals         (3.2) (1.2) (0.4)
Property and equipment, gross         $ 24.9 22.2  
Property and equipment, depreciation method         straight-line method    
Depreciation         $ 2.2 1.4 1.0
Property and equipment, accumulated depreciation         17.3 15.1  
Policy fees         7.6 9.8 $ 11.2
Charge from revaluation of deferred tax balances as a result of Tax Cuts and Jobs Act         1.3    
Hallmark Statutory Trust I [Member]              
Long-term debt, gross     $ 30.9 $ 30.9 30.9    
Proceeds from issuance of trust preferred securities     30.0        
Hallmark Statutory Trust I I [Member]              
Long-term debt, gross   $ 25.8     25.8    
Proceeds from issuance of trust preferred securities   25.0          
Facility B Revolving Credit Facility [Member]              
Credit facility, carried value         30.0 30.0  
Credit facility, fair value         $ 30.2 $ 30.2  
Minimum [Member]              
Property and equipment, estimated useful lives         3 years 3 years  
Minimum [Member] | Facility B Revolving Credit Facility [Member]              
Fair value inputs, discount rate         3.60%    
Maximum [Member]              
Property and equipment, estimated useful lives         10 years 10 years  
Maximum [Member] | Facility B Revolving Credit Facility [Member]              
Fair value inputs, discount rate         4.20%    
Scenario, Plan [Member]              
Reclassification out of AOCI as a result of Tax Act $ (2.6)            
Subordinated Debt [Member]              
Long-term debt, gross         $ 55.8 $ 55.7  
Trust Preferred Securities, fair value         $ 43.7 $ 44.2  
Current yield to maturity, percentage         8.00%    
Subordinated Debt [Member] | Hallmark Statutory Trust I [Member]              
Long-term debt, gross     $ 30.9 30.9      
Proceeds from issuance of trust preferred securities       $ 30.0      
Subordinated Debt [Member] | Hallmark Statutory Trust I I [Member]              
Long-term debt, gross   25.8          
Proceeds from issuance of trust preferred securities   $ 25.0          
Standard Commercial P & C Business Unit [Member] | Quota Share Treaty Effective January 1, 2006 [Member]              
Profit sharing payable         $ 0.3    
MGA Commercial Products [Member] | Quota Share Treaty Effective January 1, 2006 [Member]              
Profit sharing payable         $ 0.5