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Securities - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Jun. 30, 2015
Jan. 31, 2015
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Transfer of matured securities     $ 40.4
Council Oak Investment Corporation [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Pretax gain on sale of equity investments   $ 1.7  
Council Oak Partners [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Pretax gain on sale of equity investments $ 5.3