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COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS - Narrative (Details) - BNB Bank (Bank)
$ in Millions
Dec. 31, 2019
USD ($)
Commitments and Contingencies [Line Items]  
Required cash balance with Federal Reserve Bank of New York $ 20.6
Average balance maintained 63.3
Lines of credit with unaffiliated correspondent banks to provide short-term credit 373.0
Amount available for transactions under Master Repurchase Agreement 1,500.0
Federal Home Loan Bank Advances  
Commitments and Contingencies [Line Items]  
Lines of credit available on an unsecured basis 353.0
Federal funds purchased $ 0.0