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FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
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	$ 9,005	$ 7,285	$ 9,005	$ 7,285
Derivative Asset (Liability)
Beginning balance	6,318	6,531	3,927	5,259
Unrealized gain/(loss), net recognized in other non-interest income		0		0
Transfers to held for sale loans	(14,430)	(12,033)	(23,260)	(22,974)
Ending balance	9,005	7,285	9,005	7,285
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	0	0	0
Derivative Asset (Liability)
Beginning balance	0	0	0	19
Unrealized gain/(loss), net recognized in other non-interest income		0		(19)
Ending balance	0	0	0	0
Trading Security
Changes in Level 3 assets that were measured at fair value on a recurring basis
Balance at the beginning of the period	11,164	11,795	11,212	12,277
Unrealized gain/(loss), net recognized in other non-interest income	219	(148)	345	(465)
Paydown of trading security	(173)	(164)	(347)	(329)
Balance at the end of the period	11,210	11,483	11,210	11,483
Unrealized gains (losses) relating to instruments still held at the end of the period	1,466	1,056	1,466	1,056
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	11,351	5,705	11,485	3,834
Unrealized gain/(loss), net recognized in other non-interest income		0		0
Additions to servicing rights	1,827	1,795	2,835	3,201
Balance at the end of the period	11,206	7,839	11,206	7,839
Unrealized gains (losses) relating to instruments still held at the end of the period	0	0	0	0
Discontinued Operations | Commitments to lend
Derivative Asset (Liability)
Unrealized gain/(loss), net recognized in other non-interest income	17,117	12,787	28,338	25,000
Discontinued Operations | Forward commitments
Derivative Asset (Liability)
Unrealized gain/(loss), net recognized in other non-interest income		0		0
Discontinued Operations | Trading Security
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gain/(loss), net recognized in other non-interest income		0		0
Discontinued Operations | Capitalized servicing rights
Changes in Level 3 assets that were measured at fair value on a recurring basis
Unrealized gain/(loss), net recognized in other non-interest income	$ (1,972)	$ 339	$ (3,114)	$ 804

X

- 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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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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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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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.

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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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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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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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