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Loans and Other Real Estate - Carrying value of the purchased credit impaired loans acquired in mergers (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 04, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and debt securities acquired with deteriorated credit quality $ 12,205   $ 652
Highlands Bancorp, Inc.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and debt securities acquired with deteriorated credit quality 11,627 $ 13,800 0
Pascack Bancorp, Inc.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and debt securities acquired with deteriorated credit quality 122   157
Harmony Bank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and debt securities acquired with deteriorated credit quality $ 456   $ 495