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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance Loan to Value Ratio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	$ 7,700,873	$ 6,659,407
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	$ 826,731	$ 806,933
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	628	592
Total loans and leases (1)	$ 826,731	$ 806,933
Consumer | NTM Loans | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	70,100	85,800
Consumer | NTM Loans | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	753,100	717,500
Consumer | NTM Loans | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	$ 3,500	$ 3,700
Consumer | NTM Loans | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	618	580
Total loans and leases (1)	$ 824,318	$ 803,355
Consumer | NTM Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	88	101
Total loans and leases (1)	$ 67,729	$ 82,197
Consumer | NTM Loans | First lien | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	519	468
Total loans and leases (1)	$ 753,061	$ 717,484
Consumer | NTM Loans | First lien | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	11	11
Total loans and leases (1)	$ 3,528	$ 3,674
Consumer | NTM Loans | First lien | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	392	311
Total loans and leases (1)	$ 551,285	$ 461,877
Consumer | NTM Loans | First lien | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	66.90%	57.50%
Consumer | NTM Loans | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	69	60
Total loans and leases (1)	$ 51,827	$ 51,241
Consumer | NTM Loans | First lien | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	76.50%	62.30%
Consumer | NTM Loans | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	312	242
Total loans and leases (1)	$ 495,930	$ 407,810
Consumer | NTM Loans | First lien | Less than 61 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	65.90%	56.80%
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	11	9
Total loans and leases (1)	$ 3,528	$ 2,826
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	76.90%
Consumer | NTM Loans | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	218	255
Total loans and leases (1)	$ 259,044	$ 326,420
Consumer | NTM Loans | First lien | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	31.40%	40.60%
Consumer | NTM Loans | First lien | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	17	33
Total loans and leases (1)	$ 13,476	$ 25,072
Consumer | NTM Loans | First lien | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	19.90%	30.50%
Consumer | NTM Loans | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	201	220
Total loans and leases (1)	$ 245,568	$ 300,500
Consumer | NTM Loans | First lien | 61-80 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	32.60%	41.90%
Consumer | NTM Loans | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	2
Total loans and leases (1)	$ 0	$ 848
Consumer | NTM Loans | First lien | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	23.10%
Consumer | NTM Loans | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	7	14
Total loans and leases (1)	$ 9,867	$ 15,058
Consumer | NTM Loans | First lien | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	1.20%	1.90%
Consumer | NTM Loans | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	2	8
Total loans and leases (1)	$ 2,426	$ 5,884
Consumer | NTM Loans | First lien | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	3.60%	7.20%
Consumer | NTM Loans | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	5	6
Total loans and leases (1)	$ 7,441	$ 9,174
Consumer | NTM Loans | First lien | 81-100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	1.00%	1.30%
Consumer | NTM Loans | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases (1)	$ 0	$ 0
Consumer | NTM Loans | First lien | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%
Consumer | NTM Loans | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	1	0
Total loans and leases (1)	$ 4,122	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.50%	0.00%
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases (1)	$ 0	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%
Consumer | NTM Loans | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	1	0
Total loans and leases (1)	$ 4,122	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.50%	0.00%
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases (1)	$ 0	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%

X

- Definition

Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

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-Name Regulation S-X (SX)
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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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