Loans - Additional Information (Details) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2017
USD ($)
Loan
|
Dec. 31, 2016
USD ($)
Loan
|
|
| Financing Receivable Recorded Investment [Line Items] | ||
| Loans acquired | $ 1,100 | $ 1,600 |
| 90 Days or More Past Due and Still Accruing | 2,145 | 5,928 |
| Nonaccrual Past Due and Still Accruing | $ 6,494 | $ 8,238 |
| Percentage of Total Loans Due 90 Days or More | 0.07% | 0.23% |
| Number of additional loans classified as troubled debt restructuring | Loan | 0 | |
| Number of loans classified as troubled debt restructurings | Loan | 5 | 5 |
| DCB | ||
| Financing Receivable Recorded Investment [Line Items] | ||
| 90 Days or More Past Due and Still Accruing | $ 8,600 | |
| Nonaccrual Past Due and Still Accruing | $ 3,100 | |
| Percentage of Total Loans Due 90 Days or More | 36.00% |