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ACQUISITIONS, Summary of Loans Acquired (Details) - USD ($)
$ in Thousands
Jul. 12, 2019
May 12, 2017
Kinderhook Bank Corp [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition $ 649,734  
Contractual cash flows not expected to be collected (9,648)  
Expected cash flows at acquisition 640,086  
Interest component of expected cash flows (160,209)  
Fair value of acquired loans 479,877  
Kinderhook Bank Corp [Member] | Acquired Impaired Loans [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition 13,350  
Contractual cash flows not expected to be collected (4,176)  
Expected cash flows at acquisition 9,174  
Interest component of expected cash flows (551)  
Fair value of acquired loans 8,623  
Kinderhook Bank Corp [Member] | Acquired Non Impaired Loans [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition 636,384  
Contractual cash flows not expected to be collected (5,472)  
Expected cash flows at acquisition 630,912  
Interest component of expected cash flows (159,658)  
Fair value of acquired loans $ 471,254  
Merchants Bancshares, Inc. [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition   $ 1,888,028
Contractual cash flows not expected to be collected   (20,138)
Expected cash flows at acquisition   1,867,890
Interest component of expected cash flows   (379,733)
Fair value of acquired loans   1,488,157
Merchants Bancshares, Inc. [Member] | Acquired Impaired Loans [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition   15,454
Contractual cash flows not expected to be collected   (5,385)
Expected cash flows at acquisition   10,069
Interest component of expected cash flows   (793)
Fair value of acquired loans   9,276
Merchants Bancshares, Inc. [Member] | Acquired Non Impaired Loans [Member]    
Summary of loans acquired [Abstract]    
Contractually required principal and interest at acquisition   1,872,574
Contractual cash flows not expected to be collected   (14,753)
Expected cash flows at acquisition   1,857,821
Interest component of expected cash flows   (378,940)
Fair value of acquired loans   $ 1,478,881