Allowance for Credit Losses (Recorded Investments in Troubled Debt Restructured Loans) (Details) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Pre-modification outstanding recorded investment |
$ 1,934
|
$ 942
|
| Post-modification outstanding recorded investment |
2,065
|
1,073
|
| Recorded Investment |
1,872
|
914
|
| Residential Mortgage [Member] |
|
|
| Pre-modification outstanding recorded investment |
754
|
754
|
| Post-modification outstanding recorded investment |
883
|
883
|
| Recorded Investment |
699
|
726
|
| Commercial Mortgage [Member] |
|
|
| Pre-modification outstanding recorded investment |
992
|
|
| Post-modification outstanding recorded investment |
992
|
|
| Recorded Investment |
987
|
|
| Consumer: Home Equity [Member] |
|
|
| Pre-modification outstanding recorded investment |
148
|
148
|
| Post-modification outstanding recorded investment |
148
|
148
|
| Recorded Investment |
147
|
148
|
| Consumer: Other [Member] |
|
|
| Pre-modification outstanding recorded investment |
40
|
40
|
| Post-modification outstanding recorded investment |
42
|
42
|
| Recorded Investment |
$ 39
|
$ 40
|