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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Leases by Class Modified as Troubled Debt Restructurings (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
Pre- Modification Outstanding Recorded Investment	$ 2,706	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,706	$ 0	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	42	14
Pre- Modification Outstanding Recorded Investment	$ 5,122	$ 10,278	$ 4,832
Post-Modification Outstanding Recorded Investment	$ 5,139	$ 10,273	$ 4,752
Consumer | Single family residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	42	13
Pre- Modification Outstanding Recorded Investment	$ 2,416	$ 10,278	$ 4,571
Post-Modification Outstanding Recorded Investment	$ 2,433	$ 10,273	$ 4,493
Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	1
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 261
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 259

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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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Post-modification amount of investment in financing receivables 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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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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-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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