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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 6,393 $ 4,538
Interest rate swaps 1,938 3,211
Affordable housing investments 33,031 801
Other investments 15,995 5,977
Other assets 10,450 10,790
Total $ 67,807 $ 25,317