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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) banking_office segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 segment
Accounting Policies [Abstract]
Number of banking offices | banking_office				35
Number of reportable segments | segment				1		3
Transfer of held-to-maturity securities to available-for-sale securities	$ 740,900			$ 740,900
Increase to accumulated other comprehensive income	22,000
Change in Accounting Estimate [Line Items]
Salaries and employee benefits	$ 33,348		$ 32,745	$ 65,791	$ 66,214
Reversal of Excess Accrual
Change in Accounting Estimate [Line Items]
Salaries and employee benefits		$ 7,800

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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