Derivatives and Hedging Activities (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) derivativeInstrument loan	Dec. 31, 2019 USD ($) derivativeInstrument loan	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months	$ 971,000
Interest rate derivative liabilities, at fair value	$ 5,100,000
Number of participation loans with swap contingent liabilities | loan	1	1
Interest-rate swaps
Derivative [Line Items]
Asset Notional Amount	$ 38,027,000	$ 22,775,000
Asset Derivative	2,286,000	625,000
Liability Notional Amount	38,027,000	22,775,000
Liability Derivative	$ 2,286,000	$ 625,000
Number of interest rate swaps | derivativeInstrument	10	10
Gain (Loss) on interest rate swaps	$ 0	$ 0	$ 0
Counterparty credit risk exposure on interest rate swaps	0	0
Collateral posted for interest-rate swaps	5,300,000	850,000
Interest-rate swaps | Cash Flow Hedging
Derivative [Line Items]
Asset Notional Amount	0
Asset Derivative	0
Liability Notional Amount	75,000,000
Liability Derivative	$ 2,814,000
Number of interest rate swaps | derivativeInstrument	3
Derivative, individual notional amount	$ 25,000,000.0
Interest-rate swaps | Cash Flow Hedging | Contract One
Derivative [Line Items]
Derivative, term of contract	3 years
Interest-rate swaps | Cash Flow Hedging | Contract two
Derivative [Line Items]
Derivative, term of contract	4 years
Interest-rate swaps | Cash Flow Hedging | Contract three
Derivative [Line Items]
Derivative, term of contract	5 years
Receive Fixed Pay Variable | Interest-rate swaps
Derivative [Line Items]
Asset Notional Amount	$ 38,027,000	10,502,000
Asset Derivative	2,286,000	438,000
Liability Notional Amount	0	12,273,000
Liability Derivative	0	187,000
Pay Fixed Receive Variable | Interest-rate swaps
Derivative [Line Items]
Asset Notional Amount	0	12,273,000
Asset Derivative	0	187,000
Liability Notional Amount	38,027,000	10,502,000
Liability Derivative	2,286,000	438,000
Gross Amounts of Recognized Liabilities		625,000
Gross Amounts Offset in the Consolidated Balance Sheet		$ 187,000
Pay Fixed Receive Variable | Interest-rate swaps | Cash Flow Hedging
Derivative [Line Items]
Asset Notional Amount	0
Asset Derivative	0
Liability Notional Amount	75,000,000
Liability Derivative	$ 2,814,000