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Financial Derivative Instruments (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) derivative	Mar. 31, 2021 USD ($) derivative	Dec. 31, 2020 USD ($) derivative
Interest Rate Swap
Derivative [Line Items]
Expense incurred from restructuring derivatives	$ 1,760,000
Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Collateral posted, cash		$ 4,850,000
Not Designated as Hedging Instrument | Customer Loan Swaps
Derivative [Line Items]
Required amount to be pledged		$ 2,119,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2021
Derivative [Line Items]
Fixed Rate Paid		0.94%
Notional Amount	30,000,000	$ 30,000,000	$ 30,000,000
Fair Value	(244,000)	$ (61,000)	(121,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 27 2021
Derivative [Line Items]
Fixed Rate Paid		0.893%
Notional Amount	20,000,000	$ 20,000,000	20,000,000
Fair Value	(151,000)	$ (38,000)	(76,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 2 2024
Derivative [Line Items]
Fixed Rate Paid		1.59%
Notional Amount	12,500,000	$ 12,500,000	12,500,000
Fair Value	(663,000)	$ (458,000)	(626,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 5 2024
Derivative [Line Items]
Fixed Rate Paid		1.42%
Notional Amount	12,500,000	$ 12,500,000	12,500,000
Fair Value	(571,000)	$ (387,000)	(550,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12 2023
Derivative [Line Items]
Fixed Rate Paid		1.486%
Notional Amount	25,000,000	$ 25,000,000	25,000,000
Fair Value	(748,000)	$ (580,000)	(695,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12 2024
Derivative [Line Items]
Fixed Rate Paid		1.477%
Notional Amount	25,000,000	$ 25,000,000	25,000,000
Fair Value	(972,000)	$ (735,000)	(972,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2026
Derivative [Line Items]
Fixed Rate Paid		1.158%
Notional Amount	50,000,000	$ 50,000,000	50,000,000
Fair Value	(1,569,000)	$ (352,000)	(1,872,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13 2025
Derivative [Line Items]
Fixed Rate Paid		0.855%
Notional Amount	25,000,000	$ 25,000,000	25,000,000
Fair Value	(463,000)	$ (99,000)	(551,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13 2030
Derivative [Line Items]
Fixed Rate Paid		1.029%
Notional Amount	20,000,000	$ 20,000,000	20,000,000
Fair Value	(661,000)	$ 1,071,000	(339,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2023
Derivative [Line Items]
Fixed Rate Paid		0.599%
Notional Amount	0	$ 20,000,000	20,000,000
Fair Value	0	$ (129,000)	(185,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2024
Derivative [Line Items]
Fixed Rate Paid		0.643%
Notional Amount	0	$ 20,000,000	20,000,000
Fair Value	0	(84,000)	(255,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional Amount	220,000,000	260,000,000	260,000,000
Fair Value	(6,042,000)	(1,852,000)	(6,242,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Prior to December 31, 2021
Derivative [Line Items]
Notional Amount		$ 50,000,000
Number of derivative instruments | derivative		2
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Prior to June 30, 2023
Derivative [Line Items]
Notional Amount		$ 45,000,000
Number of derivative instruments | derivative		2
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Beyond June 30, 2023
Derivative [Line Items]
Notional Amount		$ 165,000,000
Number of derivative instruments | derivative		7
Cash Flow Hedging | Designated as Hedging Instrument | Customer Loan Swaps Maturity Dates December 19, 2029 , August 21, 2030, April 30,2031, October 1, 2035 and April 1, 2039
Derivative [Line Items]
Number of derivative instruments | derivative		6
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements
Derivative [Line Items]
Fair Value	$ 0	$ 0	$ 0
Number of derivative instruments | derivative	4	12	10
Derivative notional amount	$ 32,588,000	$ 83,712,000	$ 65,974,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value	$ (3,280,000)	$ (62,000)	$ (2,566,000)
Number of derivative instruments | derivative	2	6	5
Derivative notional amount	$ 16,294,000	$ 41,856,000	$ 32,987,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value	$ 3,280,000	$ 62,000	$ 2,566,000
Number of derivative instruments | derivative	2	6	5
Derivative notional amount	$ 16,294,000	$ 41,856,000	$ 32,987,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value	$ (3,280,000)	$ (1,334,000)	$ (2,603,000)
Number of derivative instruments | derivative	2	3	2
Derivative notional amount	$ 16,294,000	$ 25,059,000	$ 16,065,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value	$ 0	$ (1,272,000)	$ (37,000)
Number of derivative instruments | derivative	0	3	3
Derivative notional amount	$ 0	$ 16,797,000	$ 16,922,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value	$ 0	$ 1,272,000	$ 37,000
Number of derivative instruments | derivative	0	3	3
Derivative notional amount	$ 0	$ 16,797,000	$ 16,922,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value	$ 3,280,000	$ 1,334,000	$ 2,603,000
Number of derivative instruments | derivative	2	3	2
Derivative notional amount	$ 16,294,000	$ 25,059,000	$ 16,065,000

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