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FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Commitments to lend
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gains (losses) relating to instruments still held at the end of the period	$ 6,531	$ 8,061
Derivative Asset (Liability)
Beginning balance	5,259	4,738
Unrealized (loss) gain, net recognized in other non-interest income	12,213	17,302
Transfers to held for sale loans	(10,941)	(13,979)
Ending balance	6,531	8,061
Forward Commitments
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gains (losses) relating to instruments still held at the end of the period	0	(22)
Derivative Asset (Liability)
Beginning balance	19	100
Unrealized (loss) gain, net recognized in other non-interest income	(19)	(122)
Ending balance	0	(22)
Trading Security
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	12,277	13,229
Unrealized (loss) gain, net recognized in other non-interest income	(317)	(106)
Paydown of trading security	(165)	(157)
Balance at the end of the period	11,795	12,966
Unrealized gains (losses) relating to instruments still held at the end of the period	1,205	1,736
Capitalized Servicing Rights
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	3,834	798
Unrealized (loss) gain, net recognized in other non-interest income	465	(2)
Additions to servicing rights	1,406	180
Balance at the end of the period	5,705	976
Unrealized gains (losses) relating to instruments still held at the end of the period	$ 0	$ 0

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- Definition

This element represents the total unrealized net gains included in net income related to assets still held as of the balance sheet date.

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- Definition

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers to Loans and Leases Held for Sale

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
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Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
-Paragraph 2
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