FAIR VALUE - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value $ 0 $ 0  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value   1,879 $ 3,756
Commercial and industrial | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Commercial and industrial | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Commercial and industrial | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value   903 1,785
Commercial real estate (including multi-family residential) | Level 1 | Commercial real estate (including multi-family residential)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Commercial real estate (including multi-family residential) | Level 2 | Commercial real estate (including multi-family residential)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Commercial real estate (including multi-family residential) | Level 3 | Commercial real estate (including multi-family residential)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value   966 468
Consumer and other | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Consumer and other | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Consumer and other | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value   10 0
Other real estate owned | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value 0 0  
Other real estate owned | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value $ 0 0  
Other real estate owned | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans receivable, fair value   $ 0 $ 1,503