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Subsequent Events (Details)
$ in Thousands
Feb. 09, 2018
USD ($)
bank
Jan. 08, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Executive Officers And Directors        
Subsequent Events        
Loan receivable     $ 6,120 $ 2,380
Subsequent Event | Executive Officers And Directors        
Subsequent Events        
Loan receivable   $ 4,000    
Subsequent Event | Grandpoint Capital, Inc.        
Subsequent Events        
Total assets acquired $ 3,200,000      
Gross loans acquired 2,400,000      
Deposits $ 2,400,000      
Number of regional offices | bank 14      
Equity issued (shares) 0.4750