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Securities - Narrative (Details) - USD ($)
12 Months Ended
Nov. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Transfer of securities from held-to-maturity to available-for-sale   $ 0 $ 138,206,000 $ 0
Debt securities, held-to-maturity   0    
Recognized gains on called available-for-sale securities   251,000 88,000 0
Recognized gains on equity securities   13,000 29,000  
Recognized losses on equity securities       $ 26,000
Securities pledged or sold under agreements to repurchase   1,200,000,000 $ 1,000,000,000.0  
Equity method investments   1,500,000    
Equity method investment, other than temporary Impairment   0    
Accounting Standards Update 2019-04        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Transfer of securities from held-to-maturity to available-for-sale $ 138,200,000      
Federal Home Loan Bank New York (FHLBNY)        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Federal home loan bank, advances, branch of FHLB bank, amount of advances   11,000,000.0    
Federal Home Loan Bank Pittsburgh (FHLBPITT)        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Federal home loan bank, advances, branch of FHLB bank, amount of advances   5,200,000    
Atlantic Central Bankers Bank (ACBB)        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Federal home loan bank, advances, branch of FHLB bank, amount of advances   $ 95,000