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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
States and political subdivisions
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis
Aggregate fair value / Balance at the beginning of the period	$ 11,794	$ 12,196	$ 12,196
Principal payments received	(189)	(183)
Unrealized net gain (loss) included in other comprehensive income	(271)	176
Aggregate fair value / Balance at the end of the period			$ 11,794
Mortgage revenue bonds
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis
Aggregate fair value / Balance at the end of the period	$ 11,334	$ 12,189
Additional disclosures
Number of investment securities held | security	4
Mortgage revenue bonds | Weighted average
Additional disclosures
Discount rate (as a percent)	5.16%	4.54%	4.81%
Mortgage Servicing Rights
Additional disclosures
Discount rate (as a percent)	9.50%	9.50%	9.50%
Forecasted constant prepayment rate	13.90%	16.10%	16.00%

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of gain (loss) recognized in other comprehensive income (loss) 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.

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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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