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Financial Derivative Instruments (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) derivative	Dec. 31, 2020 USD ($) derivative	Jun. 30, 2020 USD ($) 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		$ 5,100,000
Not Designated as Hedging Instrument | Customer Loan Swaps
Derivative [Line Items]
Required amount to be pledged		$ 4,310,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2021
Derivative [Line Items]
Fixed Rate Paid		0.94%
Notional Amount		$ 0	$ 30,000,000	$ 30,000,000
Fair Value		$ 0	(121,000)	(238,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 27 2021
Derivative [Line Items]
Fixed Rate Paid		0.893%
Notional Amount		$ 0	20,000,000	20,000,000
Fair Value		$ 0	(76,000)	(150,000)
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		$ (425,000)	(626,000)	(736,000)
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		$ (359,000)	(550,000)	(649,000)
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		$ (509,000)	(695,000)	(841,000)
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		$ (671,000)	(972,000)	(1,124,000)
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		$ (820,000)	(1,872,000)	(2,119,000)
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		$ (139,000)	(551,000)	(659,000)
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		$ 482,000	(339,000)	(811,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2023
Derivative [Line Items]
Fixed Rate Paid		0.599%
Notional Amount		$ 20,000,000	20,000,000	20,000,000
Fair Value		$ (117,000)	(185,000)	(210,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2024
Derivative [Line Items]
Fixed Rate Paid		0.643%
Notional Amount		$ 20,000,000	20,000,000	20,000,000
Fair Value		(79,000)	(255,000)	(295,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional Amount		210,000,000	260,000,000	260,000,000
Fair Value		(2,637,000)	(6,242,000)	(7,832,000)
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 and October 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		12	10	6
Derivative notional amount		$ 82,918,000	$ 65,974,000	$ 49,842,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ (1,449,000)	$ (2,566,000)	$ (3,613,000)
Number of derivative instruments | derivative		6	5	3
Derivative notional amount		$ 41,459,000	$ 32,987,000	$ 24,921,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ 1,449,000	$ 2,566,000	$ 3,613,000
Number of derivative instruments | derivative		6	5	3
Derivative notional amount		$ 41,459,000	$ 32,987,000	$ 24,921,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ (2,138,000)	$ (2,603,000)	$ (3,613,000)
Number of derivative instruments | derivative		3	2	3
Derivative notional amount		$ 24,927,000	$ 16,065,000	$ 24,921,000
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Liabilities | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ (689,000)	$ (37,000)	$ 0
Number of derivative instruments | derivative		3	3	0
Derivative notional amount		$ 16,532,000	$ 16,922,000	$ 0
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Pay Fixed, Receive Variable
Derivative [Line Items]
Fair Value		$ 689,000	$ 37,000	$ 0
Number of derivative instruments | derivative		3	3	0
Derivative notional amount		$ 16,532,000	$ 16,922,000	$ 0
Cash Flow Hedging | Not Designated as Hedging Instrument | Other Assets | Customer loan interest swap agreements | Receive Fixed, Pay Variable
Derivative [Line Items]
Fair Value		$ 2,138,000	$ 2,603,000	$ 3,613,000
Number of derivative instruments | derivative		3	2	3
Derivative notional amount		$ 24,927,000	$ 16,065,000	$ 24,921,000

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