Allowance for Loan and Lease Losses - Loans by Class Modified as Troubled Debt Restructurings (Details) - Originated Loans and Leases
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2017
USD ($)
loan
|
Dec. 31, 2016
USD ($)
loan
|
| Financing Receivable, Modifications [Line Items] |
|
|
| Number of Loans | loan |
6
|
15
|
| Pre-Modification Outstanding Recorded Investment |
$ 716
|
$ 2,439
|
| Post- Modification Outstanding Recorded Investment |
$ 716
|
$ 2,439
|
| Number of Loans TDRs | loan |
1
|
1
|
| Post- Modification Outstanding Recorded Investment TDRs |
$ 55
|
$ 1,800
|
| Commercial and industrial | Other |
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
| Number of Loans | loan |
|
2
|
| Pre-Modification Outstanding Recorded Investment |
|
$ 1,115
|
| Post- Modification Outstanding Recorded Investment |
|
$ 1,115
|
| Number of Loans TDRs | loan |
|
0
|
| Post- Modification Outstanding Recorded Investment TDRs |
|
$ 0
|
| Commercial real estate | Other |
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
| Number of Loans | loan |
|
1
|
| Pre-Modification Outstanding Recorded Investment |
|
$ 50
|
| Post- Modification Outstanding Recorded Investment |
|
$ 50
|
| Number of Loans TDRs | loan |
|
1
|
| Post- Modification Outstanding Recorded Investment TDRs |
|
$ 1,800
|
| Residential real estate | Home equity |
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
| Number of Loans | loan |
6
|
12
|
| Pre-Modification Outstanding Recorded Investment |
$ 716
|
$ 1,274
|
| Post- Modification Outstanding Recorded Investment |
$ 716
|
$ 1,274
|
| Number of Loans TDRs | loan |
1
|
0
|
| Post- Modification Outstanding Recorded Investment TDRs |
$ 55
|
$ 0
|