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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Summary of TDR Modification Type (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	0	0
Post-Modification Outstanding Recorded Investment | $	$ 2,706	$ 0	$ 0
Commercial | Commercial and industrial | Change in Principal Payments and Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0
Post-Modification Outstanding Recorded Investment | $	$ 0
Commercial | Commercial and industrial | Change in Principal Payments
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1
Post-Modification Outstanding Recorded Investment | $	$ 2,706
Commercial | Commercial and industrial | Change in Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0
Post-Modification Outstanding Recorded Investment | $	$ 0
Commercial | Commercial and industrial | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0
Post-Modification Outstanding Recorded Investment | $	$ 0
Commercial | Commercial and industrial | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0
Post-Modification Outstanding Recorded Investment | $	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	42	14
Post-Modification Outstanding Recorded Investment | $	$ 5,139	$ 10,273	$ 4,752
Consumer | Change in Principal Payments and Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	34	0
Post-Modification Outstanding Recorded Investment | $	$ 1,290	$ 8,622	$ 0
Consumer | Change in Principal Payments
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	4	0
Post-Modification Outstanding Recorded Investment | $	$ 3,849	$ 780	$ 0
Consumer | Change in Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	2	0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 146	$ 0
Consumer | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	14
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 519	$ 4,752
Consumer | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 206	$ 0
Consumer | Single family residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	42	13
Post-Modification Outstanding Recorded Investment | $	$ 2,433	$ 10,273	$ 4,493
Consumer | Single family residential mortgage | Change in Principal Payments and Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	34	0
Post-Modification Outstanding Recorded Investment | $	$ 1,290	$ 8,622	$ 0
Consumer | Single family residential mortgage | Change in Principal Payments
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	4	0
Post-Modification Outstanding Recorded Investment | $	$ 1,143	$ 780	$ 0
Consumer | Single family residential mortgage | Change in Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	2	0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 146	$ 0
Consumer | Single family residential mortgage | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	13
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 519	$ 4,493
Consumer | Single family residential mortgage | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 206	$ 0
Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	1
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 259
Consumer | Other consumer | Change in Principal Payments and Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			0
Post-Modification Outstanding Recorded Investment | $			$ 0
Consumer | Other consumer | Change in Principal Payments
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			0
Post-Modification Outstanding Recorded Investment | $			$ 0
Consumer | Other consumer | Change in Interest Rates
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			0
Post-Modification Outstanding Recorded Investment | $			$ 0
Consumer | Other consumer | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1
Post-Modification Outstanding Recorded Investment | $			$ 259
Consumer | Other consumer | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			0
Post-Modification Outstanding Recorded Investment | $			$ 0

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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