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Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Securities - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Realized gains on available-for-sale debt securities	$ 0	$ 133	$ 429	$ 999
Realized losses on available-for-sale debt securities	0	0	0	595
Proceeds from sales of available-for-sale debt securities	0	$ 24,200	42,333	$ 176,249
Realized loss on equity securities, net	2
Realized gains on equity securities, net			17
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	11,900		11,900
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	5,900		5,900
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		$ 95