XML 63 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1
Loans and Allowance for Loan Losses - Percentage of Loans Geographically and by Collateral (Details)
Dec. 31, 2017
Dec. 31, 2016
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans by class to all loans 67.00%  
Commercial real estate | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans by class and geographic location 85.00%  
Loans secured by real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans by class to all loans 87.00% 85.00%