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FAIR VALUE MEASUREMENTS - Unobservable Inputs Recurring (Details) - Level 3 - Recurring - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Quantitative information about the significant unobservable inputs within Level 3
Total	$ 24,031,000	$ 21,389,000
Trading Security
Quantitative information about the significant unobservable inputs within Level 3
Assets measured on recurring basis	$ 11,795,000	$ 12,277,000
Trading Security | Discounted Cash Flow
Quantitative information about the significant unobservable inputs within Level 3
Discount Rate (as percent)	3.15%	2.74%
Commitments to Lend
Quantitative information about the significant unobservable inputs within Level 3
Assets measured on recurring basis	$ 6,531,000	$ 5,259,000
Commitments to Lend | Historical Trend
Quantitative information about the significant unobservable inputs within Level 3
Closing Ratio (as percent)	80.65%	81.53%
Commitments to Lend | Pricing Model
Quantitative information about the significant unobservable inputs within Level 3
Origination Costs, per loan	$ 3,063	$ 3,692
Forward Commitments
Quantitative information about the significant unobservable inputs within Level 3
Assets measured on recurring basis		$ 19,000
Liabilities measured on recurring basis	$ 0
Forward Commitments | Historical Trend
Quantitative information about the significant unobservable inputs within Level 3
Closing Ratio (as percent)	80.65%	81.53%
Forward Commitments | Pricing Model
Quantitative information about the significant unobservable inputs within Level 3
Origination Costs, per loan	$ 3,063	$ 3,692
Capitalized Servicing Rights
Quantitative information about the significant unobservable inputs within Level 3
Assets measured on recurring basis	$ 5,705,000	$ 3,834,000
Capitalized Servicing Rights | Discounted Cash Flow
Quantitative information about the significant unobservable inputs within Level 3
Discount Rate (as percent)	9.96%	10.95%
Constant prepayment rate (CPR) (as percent)	8.30%	10.00%

X

- Definition

Represents the closing ratio used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

Represents the origination costs used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of asset after deduction of liability.

+ References

No definition available.

+ Details

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- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

+ References

No definition available.

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