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% |