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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 7,700,873,000 | $ 6,659,407,000
Percentage decrease in credit score to run exception report | 10.00% |
Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 100.00% | 100.00%
NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 826,731,000 | $ 806,933,000
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 10.70% | 12.10%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 826,731,000 | $ 806,933,000
Increase (decrease) in loans receivable | $ 19,800,000 |
Increase (decrease) in loans receivable, percentage | 2.50% |
Consumer | NTM Loans | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 70,100,000 | 85,800,000
Interest only notes balloon payment period | 15 years |
Consumer | NTM Loans | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 753,100,000 | 717,500,000
Consumer | NTM Loans | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | 3,500,000 | 3,700,000
Consumer | NTM Loans | Nonperforming Financing Receivable | Green Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | 0 | 0
Consumer | NTM Loans | Nonperforming Financing Receivable | Interest Only Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | 0 | 1,200,000
Consumer | NTM Loans | Nonperforming Financing Receivable | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans and leases (1) | $ 0 | $ 0
Consumer | NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases | 10.70% | 12.10%

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