Securities - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Debt securities, held-to-maturity, amortized cost	$ 269,268,000		$ 269,268,000		$ 0
Realized gains on available-for-sale debt securities	797,000	$ 0	1,100,000	$ 178,000
Realized losses on available-for-sale debt securities	851,000	0	851,000	0
Proceeds from sales of available-for-sale debt securities	103,800,000	0	142,679,000	42,333,000
Realized gains on called available-for-sale debt securities	0	0	0	251,000
Realized gains (losses) on equity securities, net	(6,000)	$ (2,000)	(18,000)	$ 17,000
Unrealized Losses	2,099,000		2,099,000		0
Held-to-maturity debt securities	269,268,000		269,268,000		$ 0
Federal Home Loan Bank New York (FHLBNY)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Holdings of FHLBNY, FHLBPITT and ACBB stock, amount of advances	9,300,000		9,300,000
Federal Home Loan Bank Pittsburgh (FHLBPITT)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Holdings of FHLBNY, FHLBPITT and ACBB stock, amount of advances	1,000,000		1,000,000
Atlantic Central Bankers Bank (ACBB)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Holdings of FHLBNY, FHLBPITT and ACBB stock, amount of advances	$ 95,000		$ 95,000

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of advances from the Federal Home Loan Bank (FHLB).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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