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Debt - Additional Information (Long Term Debt) (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 03, 2015
USD ($)
May 31, 2007
USD ($)
shares
Jun. 30, 2003
USD ($)
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 04, 2019
USD ($)
Jun. 30, 2016
USD ($)
Derivative
Oct. 31, 2015
USD ($)
Debt Instrument [Line Items]                        
Advances from the FHLB             $ 165,816,000 $ 181,100,000        
Repayments of debt                 $ 34,000,000.0      
Long-term debt prepayment fee             0 0 2,828,000      
Securities sold under agreement to repurchase maturities due             $ 0 $ 0        
Repayments of long-term debt       $ 20,000,000.0                
Cash Flow Hedging | Interest Rate Swaps                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                     $ 30,000,000.0  
Number of derivatives | Derivative                     2  
Collateralized FHLB Advances                        
Debt Instrument [Line Items]                        
Long-term debt prepayment fee                 $ 638,000      
Collateralized FHLB Advances | Weighted Average                        
Debt Instrument [Line Items]                        
Weighted average interest rate of advances             2.24% 2.10%        
Debt Securities Sold under Agreements to Repurchase                        
Debt Instrument [Line Items]                        
Repayments of debt         $ 20,000,000.0              
Long-term debt prepayment fee         $ 2,200,000              
Subordinated Debenture Offering | Fixed To Floating                        
Debt Instrument [Line Items]                        
Debt instrument, face amount           $ 75,000,000.0            
Debt instrument, interest rate           5.125%            
Debt issuance costs           $ 1,500,000            
Subordinated Debenture Offering | Fixed To Floating | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Debt instrument, basis point           3.97%            
Junior Subordinated Debt | Lakeland Bancorp Capital Trust IV                        
Debt Instrument [Line Items]                        
Debt instrument, face amount   $ 20,600,000                    
Debt instrument, basis point   1.52%                    
Distribution rate on securities   6.61%                    
Distribution of securities years   5 years                    
Trust preferred securities, issued (in shares) | shares   20,000                    
Trust preferred securities, face value   $ 1,000                    
Proceeds of trust preferred securities   $ 20,000,000.0                    
Debentures extinguished $ 10,000,000.0                      
Gain on extinguishment of debt $ 1,800,000                      
Junior Subordinated Debt | Lakeland Bancorp Capital II                        
Debt Instrument [Line Items]                        
Debt instrument, face amount     $ 20,600,000                  
Debt instrument, basis point     3.10%                  
Distribution rate on securities     5.71%                  
Distribution of securities years     5 years                  
Trust preferred securities, issued (in shares) | shares     20,000                  
Trust preferred securities, face value     $ 1,000                  
Proceeds of trust preferred securities     $ 20,000,000.0                  
Highlands Bancorp, Inc. | Subordinated Debenture Offering | Fixed Rate                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                   $ 5,000,000.0   $ 7,500,000
Debt instrument, interest rate                   8.00%   6.94%