XML 63 R50.htm IDEA: XBRL DOCUMENT v3.10.0.1
Summary of Significant Accounting Policies - Summary of Purchase Price Accounting (Parenthetical) (Detail) - USD ($)
$ in Thousands
Apr. 02, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Investments In Loans [Line Items]        
Premiums in loan portfolio   $ 50,695   $ 88,886
Affiliated Entity [Member]        
Investments In Loans [Line Items]        
Notes payable     $ 20,177  
US Treasury Securities [Member] | Capital Purchase Program [Member]        
Investments In Loans [Line Items]        
Preferred stock $ 26,303      
61-90 [Member]        
Investments In Loans [Line Items]        
Premiums in loan portfolio $ 12,387 $ 9,395   $ 12,387