Loans and Allowance for Loan Losses - Impaired Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	$ 4,193		$ 4,193		$ 4,411
Impaired financing receivable, with no allowance recorded, unpaid principal balance	4,371		4,371		4,577
Impaired financing receivable, with an allowance recorded, recorded investment	176		176		148
Impaired financing receivable, with an allowance recorded, unpaid principal balance	176		176		182
Impaired financing receivable, with an allowance recorded, related allowance	1		1		19
Average Recorded Investment	4,547	$ 1,777	4,826	$ 1,790
Interest Income	11	8	22	16
Interest Foregone on Impaired Loans [Abstract]
Interest income that would have been recognized had impaired loans performed in accordance with their original terms	67	32	146	64
Less: interest income recognized on impaired loans on a cash basis	(11)	(8)	(22)	(16)
Interest income foregone on impaired loans	56	24	124	48
Real Estate \| Commercial property
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	337		337		339
Impaired financing receivable, with no allowance recorded, unpaid principal balance	335		335		338
Impaired financing receivable, with an allowance recorded, recorded investment	0		0		0
Impaired financing receivable, with an allowance recorded, unpaid principal balance	0		0		0
Impaired financing receivable, with an allowance recorded, related allowance	0		0		0
Average Recorded Investment	337	0	338	0
Interest Income	6	0	11	0
Real Estate \| Residential property
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			0	76
Interest Income			0	0
Real Estate \| SBA property
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	1,458		1,458		1,699
Impaired financing receivable, with no allowance recorded, unpaid principal balance	1,596		1,596		1,828
Impaired financing receivable, with an allowance recorded, recorded investment	176		176		120
Impaired financing receivable, with an allowance recorded, unpaid principal balance	176		176		154
Impaired financing receivable, with an allowance recorded, related allowance	1		1		4
Average Recorded Investment	1,692	1,666	1,728	1,507
Interest Income	4	6	9	12
Commercial and Industrial \| Commercial term
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	26		26		28
Impaired financing receivable, with no allowance recorded, unpaid principal balance	26		26		28
Impaired financing receivable, with an allowance recorded, recorded investment	0		0		0
Impaired financing receivable, with an allowance recorded, unpaid principal balance	0		0		0
Impaired financing receivable, with an allowance recorded, related allowance	0		0		0
Average Recorded Investment	26	52	26	57
Interest Income	1	1	1	2
Commercial and Industrial \| Commercial lines of credit
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	1,968		1,968		1,888
Impaired financing receivable, with no allowance recorded, unpaid principal balance	1,968		1,968		1,888
Impaired financing receivable, with an allowance recorded, recorded investment	0		0		0
Impaired financing receivable, with an allowance recorded, unpaid principal balance	0		0		0
Impaired financing receivable, with an allowance recorded, related allowance	0		0		0
Average Recorded Investment	2,074	0	2,254	0
Interest Income	0	0	0	0
Commercial and Industrial \| SBA commercial term
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no allowance recorded, recorded investment	404		404		457
Impaired financing receivable, with no allowance recorded, unpaid principal balance	446		446		495
Impaired financing receivable, with an allowance recorded, recorded investment	0		0		28
Impaired financing receivable, with an allowance recorded, unpaid principal balance	0		0		28
Impaired financing receivable, with an allowance recorded, related allowance	0		0		$ 15
Average Recorded Investment	418	59	480	150
Interest Income	$ 0	$ 1	$ 1	$ 2

Financing Receivable, Recorded Investment, Interest Income if Impaired Loans Performed Under Original Terms

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Interest Foregone on Impaired Loans [Abstract]

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of allowance for credit losses related to recorded investment.

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

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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

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

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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