Loans and Credit Quality - Newly Restructured Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	8	7
Pre-modification, total modification	$ 3,286	$ 4,625
Post-modification, number of contracts | contract	8	7
Post-modification, total modification	$ 3,151	$ 3,087
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	7	4
Pre-modification, total modification	$ 3,094	$ 2,704
Post-modification, number of contracts | contract	7	4
Post-modification, total modification	$ 2,969	$ 1,166
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1	3
Pre-modification, total modification	$ 192	$ 1,921
Post-modification, number of contracts | contract	1	3
Post-modification, total modification	$ 182	$ 1,921
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Rate Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Rate Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Term Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Term Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	701	4,625
Post-modification, total modification	590	3,087
Payment Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	509	2,704
Post-modification, total modification	408	1,166
Payment Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	192	1,921
Post-modification, total modification	182	1,921
Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	2,585	0
Post-modification, total modification	2,561	0
Combination Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	2,585	0
Post-modification, total modification	2,561	0
Combination Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	$ 0	$ 0