Loans and Allowance for Loan Losses - Narrative (Details)	6 Months Ended
	Jun. 30, 2019 USD ($) borrower numberOfQuarters category property loan method component relationship	Jun. 30, 2018 USD ($) property relationship	Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items]
Allowance for loan losses, number of evaluation components | component	2
Impaired loans collectively evaluated	$ 2,000,000.0		$ 1,700,000
Impaired loans, related reserves	$ 170,000		218,000
Number of rolling quarters | numberOfQuarters	12
Liability for unfunded commitments	$ 284,000		$ 284,000
Total valuation methods used on impaired loans | method	3
Impaired loans, identified during the period	$ 542,000
Impaired loans, principal curtailment	1,500,000
Impaired loans, partial charge-offs	676,000
Reclassification to other real estate owned	79,000
Classification to performing loans	185,000
Foreclosed properties held	$ 1,400,000	$ 1,800,000
Number of points in internal risk rating system | category	9
Number of categories in internal risk rating system considered as not criticized | category	6
Commercial relationship credit review threshold amount	$ 1,000,000
Past due period before loans placed in non-accrual status	90 days
Recent loan payment history before removal from non-accrual status	6 months
Commercial and Non-Residential Real Estate
Financing Receivable, Impaired [Line Items]
Foreclosure of loan relationship | relationship	2	2
Forclosure of unrelated borrower | loan	3
Residential Real Estate
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans (as a percentage)	41.00%	43.00%
Number foreclosed properties held | property	12	13
Foreclosed properties held	$ 583,000	$ 755,000
Consumer
Financing Receivable, Impaired [Line Items]
Number of additional collateralized loans in the process of foreclosure | loan	2
Investment in loans in the process of foreclosure	$ 516,000
Investment in loans in the process of foreclosure, related allowance	0
Total Recorded Investment In Impaired Financing Receivables | Credit Concentration Risk
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans	$ (1,600,000)
Increase (decrease) in impaired loans (as a percentage)	(12.60%)
Commercial Loan Relationship One | Commercial and Non-Residential Real Estate
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | property	2
Commercial Loan Relationship One | Residential Real Estate
Financing Receivable, Impaired [Line Items]
Foreclosed properties held	$ 294,000	395,000
Commercial Loan Relationship Two | Residential Real Estate
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | property	7
Foreclosed properties held	$ 174,000	178,000
Commercial Loan Relationship Three | Residential Real Estate
Financing Receivable, Impaired [Line Items]
Foreclosed properties held	$ 115,000	228,000
Forclosure of unrelated borrower | borrower	3
Other Loan Relationships
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | property	10
Foreclosed properties held	$ 23,000	$ 891,000
Other Loan Relationships | Commercial and Non-Residential Real Estate
Financing Receivable, Impaired [Line Items]
Number foreclosed properties held | property	2
Other Loan Relationships | Residential Real Estate
Financing Receivable, Impaired [Line Items]
Increase (decrease) in impaired loans (as a percentage)	59.00%
Number foreclosed properties held | property	3	3
Foreclosed properties held	$ 826,000	$ 79,000
Foreclosure of loan relationship | relationship	2