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Allowance for Loan Losses - Additional information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision expense for loan losses	$ 675,000	$ 225,000	$ 1,300,000	$ (175,000)
Net unfavorable shift			$ 1,475,000
Reserve coverage of total loans, excluding PPP loans	1.17%		1.17%
provision recovery recorded	$ (675,000)	(225,000)	$ (1,300,000)	175,000
Financing Receivable, Individually Evaluated for Impairment	$ 867,000		867,000		$ 824,000
Debt Instrument Non Performing Assets			$ 2,600,000
Percentage Of Allowance For Total Loans	1.08%		1.08%		1.05%
Non-performing assets as a percent of loans	0.27%		0.27%		0.26%
Allowance for Loan and Lease Losses Write-offs, Net			$ 295,000	$ 151,000
Allowance For Loan And Lease Losses Write Off Percentage			0.04%	0.02%
Percentage Of Allowance For Non Performing Assets	395.00%		395.00%		397.00%
Financing Receivable, Recorded Investment, Past Due	$ 4,078,000		$ 4,078,000		$ 4,399,000
Hotel industry
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision expense for loan losses			29,000,000
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	2,000,000		2,000,000
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	100,000		100,000
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
provision recovery recorded	638,000	$ (464,000)	805,000	$ 60,000
Financing Receivable, Individually Evaluated for Impairment	859,000		859,000		816,000
Minimum aggregate balances for commercial loan relationship under structure loan rating process	1,000,000		1,000,000
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Past Due	78,000		$ 78,000		$ 0
Commercial | Minimum | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed			40.00%
Consumer | Minimum | Consumer and Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 150,000		$ 150,000

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- Definition

The percentage of after recoveries, of loans and leases that have been written-off.

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The amount of net unfavorable shift.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of financing receivable past due.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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