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Loans - Summary of Average of Impaired Loans and Related Interest Income by Loan Portfolio Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	$ 36	$ 74	$ 18	$ 639
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	6,640	7,532	6,942	7,826
Impaired Loans with No Allowance: Interest Income	144	36	462	162
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	36	0	18	545
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	0	0	0	92
Impaired Loans with No Allowance: Interest Income	0	0	0	44
Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	0	0	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	6,163	7,215	6,435	7,525
Impaired Loans with No Allowance: Interest Income	136	36	454	118
Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	0	0	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	0	0	0	0
Impaired Loans with No Allowance: Interest Income	0	0	0	0
Residential mortgage
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	0	0	94
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	430	317	484	209
Impaired Loans with No Allowance: Interest Income	8	0	8	0
Home equity lines of credit
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	74	0	37
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	47	0	23	0
Impaired Loans with No Allowance: Interest Income	$ 0	$ 0	$ 0	$ 0

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
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Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

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Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

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