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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Loan	Mar. 31, 2015 USD ($) Loan	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,463,068,000	$ 3,933,715,000	$ 5,184,394,000
Percentage decrease in credit score to run exception report	10.00%
Number of Loans | Loan		2
Troubled debt restructured loans and leases	$ 17,673,000		9,812,000
Number of loans modified that had payments default during the period | Loan	2	0
Aggregate principal, loans modified that had payments default during the period	$ 407,000
Loans delinquent	60 days
Interest rate changes, extension of maturities, and principal payment deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	17
Troubled debt restructured loans and leases	$ 4,300,000
Interest rate changes and extension of maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	15
Troubled debt restructured loans and leases	$ 3,900,000
Extension of maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	4
Troubled debt restructured loans and leases	$ 368,000
Extension of maturities and principal payment deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	1
Troubled debt restructured loans and leases	$ 507,000
Interest rate changes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	1
Troubled debt restructured loans and leases	$ 78,000
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	$ 1,300,000		$ 2,100,000
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%		100.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	38	2
Consumer | Single Family Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,282,445,000	$ 1,169,134,000
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	799,801,000		$ 785,908,000
Troubled debt restructured loans and leases	$ 3,694,000		$ 3,968,000
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%		15.20%
Non-Traditional Mortgages (NTM) | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 799,801,000		$ 785,908,000
Increase (decrease) in loans receivable	$ 13,900,000
Increase (decrease) in loans receivable, percentage	1.80%
Non-Traditional Mortgages (NTM) | Consumer | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 106,500,000		109,800,000
Interest only notes balloon payment period	15 years
Non-Traditional Mortgages (NTM) | Consumer | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 682,000,000		664,500,000
Non-Traditional Mortgages (NTM) | Consumer | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	11,300,000		11,600,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	10,000,000		10,100,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,400,000		4,600,000
Non-Traditional Mortgages (NTM) | Consumer | Nonperforming Financing Receivable | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 0		$ 0
Non-Traditional Mortgages (NTM) | Consumer | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%		15.20%

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