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GOODWILL AND INTANGIBLE ASSETS - Changes in carrying values of goodwill and intangible assets (Details) - Changes in carrying values of goodwill and intangible assets - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill      
Balance, beginning of period $ 12,552 $ 12,552 $ 12,552
Additions 1,263
Impairment
Balance, end of period 13,815 12,552 12,552
Core Deposit Intangibles      
Cost, beginning of period 5,248 5,248 5,248
New York branch purchase 633
Impairment
Cost, end of period 5,881 5,248 5,248
Amortization, beginning of period (3,511) (2,910) (2,258)
Amortization (533) (601) (652)
Amortization, end of period (4,044) (3,511) (2,910)
Core deposit intangibles, net $ 1,837 $ 1,737 $ 2,338