Loans and Credit Quality - Newly Restructured Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	2
Pre-modification, total modification	$ 4,369
Post-modification, number of contracts | contract	2
Post-modification, total modification	$ 4,367
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	2
Pre-modification, total modification	$ 4,369
Post-modification, number of contracts | contract	2
Post-modification, total modification	$ 4,367
Rate Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Rate Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Term Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	135
Post-modification, total modification	134
Term Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	135
Post-modification, total modification	134
Payment Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	4,234
Post-modification, total modification	4,233
Payment Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	4,234
Post-modification, total modification	4,233
Combination Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Combination Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0