Loans and Credit Quality - Troubled Debt Restructured Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	$ 3,087
Existing Troubled Debt Restructurings	11,744
Total	14,831	$ 23,800
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	1,166
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	1,921
Accrual Status
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	227
Existing Troubled Debt Restructurings	3,186
Total	3,413
Accrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	0
Accrual Status | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	227
Nonaccrual Status
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	2,860
Existing Troubled Debt Restructurings	8,558
Total	11,418
Nonaccrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	1,166
Nonaccrual Status | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	$ 1,694