Loans and Credit Quality - Newly Restructured Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	7	3
Pre-modification, total modification	$ 4,625	$ 12,953
Post-modification, number of contracts | contract	7	3
Post-modification, total modification	$ 3,087	$ 10,610
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract		1
Pre-modification, total modification		$ 2,078
Post-modification, number of contracts | contract		1
Post-modification, total modification		$ 2,059
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	4	2
Pre-modification, total modification	$ 2,704	$ 10,875
Post-modification, number of contracts | contract	4	2
Post-modification, total modification	$ 1,166	$ 8,551
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	3
Pre-modification, total modification	$ 1,921
Post-modification, number of contracts | contract	3
Post-modification, total modification	$ 1,921
Rate Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Rate Modification | Commercial | Asset Quality Rating - Special Mention
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	0
Post-modification, total modification	0	0
Rate Modification | Real estate term owner occupied | 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	0	12,743
Post-modification, total modification	0	10,408
Term Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification		2,078
Post-modification, total modification		2,059
Term Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0	10,665
Post-modification, total modification	0	8,349
Term Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Payment Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	4,625	210
Post-modification, total modification	3,087	202
Payment Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification		0
Post-modification, total modification		0
Payment Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	2,704	210
Post-modification, total modification	1,166	202
Payment Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	1,921
Post-modification, total modification	1,921
Combination Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Combination Modification | Commercial | Asset Quality Rating - Special Mention
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	0
Post-modification, total modification	0	$ 0
Combination Modification | Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0