SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Loans and Allowance for Loan Losses
Period past due for loans to be considered as delinquent	30 days
Minimum period loans are past due as condition for determining whether impaired	90 days
Mortgage Servicing Rights
Amortization on the servicing asset	$ 915,000	$ 574,000	$ 369,000
Loans serviced for others	334,500,000	322,900,000
Forward sales commitments
Derivative Financial Instruments
Derivative Liability	0
Mortgage Banking
Derivative Financial Instruments
Revision in accounting estimate	$ 706,000
Minimum
Derivative Financial Instruments
Period between issuance of a loan commitment and closing and sale of the loan	30 days
Maximum
Derivative Financial Instruments
Period between issuance of a loan commitment and closing and sale of the loan	120 days
Interest rate cap
Interest rate cap
Notional amount	$ 100,000,000
Transaction term	5 years
Number of quarterly caps | item	20
Fixed cost	$ 1,500,000
Interest rate cap | LIBOR
Interest rate cap
Description of variable rate basis	3 month Libor
Strike price	3.00%
Level III
Derivative Financial Instruments
Interest rate lock commitments	$ 1,583,000	1,020,000	$ 1,081,000
Recurring | Forward sales commitments
Derivative Financial Instruments
Derivative Liability		$ 431,000