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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) Loan bulk_loan_acquisition	Dec. 31, 2014 USD ($) Loan	Dec. 31, 2013 USD ($) Loan bulk_loan_acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,184,394,000	$ 3,949,122,000
Percentage decrease in credit score to run exception report	10.00%
Number of Loans | Loan	14	6	2
Loans delinquent	60 days
Number of bulk loan acquisitions | bulk_loan_acquisition	7		5
Unpaid principal balance of loan acquisition	$ 622,100,000		$ 1,020,000,000
Fair value of loan acquisition	578,700,000		849,900,000
Unpaid principal balance with credit quality deterioration at acquisition	571,200,000		485,100,000
Fair value with credit quality deterioration at acquisition	529,200,000		348,600,000
Unpaid principal balances of PCI loans sold	52,400,000	$ 91,900,000	141,700,000
Carrying value of loans sold	32,500,000	56,700,000	80,500,000
Gain (loss) on PCI loans sold	9,400,000	11,800,000	2,400,000
Discount on loans and leases purchased	1,400,000	0	$ 43,400,000
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	$ 2,100,000	$ 1,900,000
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Non-Traditional Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 785,908,000	$ 350,575,000
Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	15.20%	8.90%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan	14	6	2
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,150,453,000	$ 1,048,485,000
Number of Loans | Loan	13	5
Consumer | Non-Traditional Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 785,908,000	$ 350,575,000
Increase (decrease) in loans receivable	$ 435,300,000
Increase (decrease) in loans receivable, percentage	124.20%
Consumer | Non-Traditional Mortgages | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 675,960,000	222,306,000
Consumer | Non-Traditional Mortgages | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 109,800,000	128,200,000
Interest only notes balloon payment period	15 years
Consumer | Non-Traditional Mortgages | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 664,500,000	209,300,000
Consumer | Non-Traditional Mortgages | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	11,600,000	13,100,000
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	10,100,000	12,500,000
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,600,000	2,000,000
Consumer | Non-Traditional Mortgages | Nonperforming Financing Receivable | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 0	$ 0
Consumer | Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	15.20%	8.90%

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