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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial commitments whose contractual amount represents credit risk    
Total $ 1,446,396 $ 1,113,123
Commitments to originate new loans    
Financial commitments whose contractual amount represents credit risk    
Total 243,519 102,145
Unused funds on commercial and other lines of credit    
Financial commitments whose contractual amount represents credit risk    
Total 574,043 525,603
Unadvanced funds on home equity lines of credit    
Financial commitments whose contractual amount represents credit risk    
Total 281,621 258,897
Unadvanced funds on construction and real estate loans    
Financial commitments whose contractual amount represents credit risk    
Total 320,635 201,764
Standby letters of credit    
Financial commitments whose contractual amount represents credit risk    
Total 14,939 12,775
Lease obligation    
Financial commitments whose contractual amount represents credit risk    
Total $ 11,639 $ 11,939