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Senior and Subordinated Debt (Details) - Narrative - USD ($)
Sep. 29, 2016
Dec. 31, 2016
Nov. 22, 2016
Apr. 01, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Subordinated notes   $ 146,573,000     $ 38,499,000
Senior notes   0     114,891,000
Subordinated notes due in 2016          
Debt Instrument [Line Items]          
Subordinated notes   0   $ 38,500,000 $ 38,499,000
Interest rate       5.85% 5.85%
Senior notes          
Debt Instrument [Line Items]          
Interest rate     5.875%   5.875%
Senior notes     $ 115,000,000    
Subordinated notes due in 2026          
Debt Instrument [Line Items]          
Subordinated notes   $ 146,573,000     $ 0
Interest rate 5.875% 5.875%      
Debt instrument, face amount $ 150,000,000        
Proceeds from issuance of debt $ 146,500,000