v3.8.0.1
Loans - Composition of TDRs by Accrual and Nonaccrual Status (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Troubled Debt Restructurings, Nonaccrual $ 11,260 $ 11,359
Troubled Debt Restructurings, Total 4,400 4,500
Principal Reduction And Extended Maturity    
Accounts Notes And Loans Receivable [Line Items]    
Troubled Debt Restructurings, Accrual 165 195
Troubled Debt Restructurings, Nonaccrual 4,220 4,296
Troubled Debt Restructurings, Total 4,385 4,491
Principal Reduction And Extended Maturity | Commercial Real Estate Loans    
Accounts Notes And Loans Receivable [Line Items]    
Troubled Debt Restructurings, Accrual 0 0
Troubled Debt Restructurings, Nonaccrual 1,572 1,598
Troubled Debt Restructurings, Total 1,572 1,598
Principal Reduction And Extended Maturity | Commercial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Troubled Debt Restructurings, Accrual 165 195
Troubled Debt Restructurings, Nonaccrual 2,648 2,698
Troubled Debt Restructurings, Total $ 2,813 $ 2,893