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SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
SECURITIES
Retained earnings	$ 311,055	$ 311,055	$ 315,234
Adjustment to carrying value of equity securities with no readily determinable fair value	128	128
Carrying value of securities pledged to secure public and trust deposits	288,305	$ 288,305	291,404
Illinois
SECURITIES
Percentage of obligations of local municipalities		56.00%
Percentage of general obligations in local municipalities		91.00%
Mortgage backed securities
SECURITIES
Amortized cost of securities held-to-maturity	44,739	$ 44,739	48,611
Held-to-maturity | Municipal securities
SECURITIES
Amortized cost of securities held-to-maturity	$ 55,221	$ 55,221	$ 72,982
ASU 2016-01 | Restatement Adjustment
SECURITIES
Retained earnings				$ 122

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- Definition

The percentage of general obligations in local municipalities.

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The percentage of obligations of local municipalities in local municipalities portfolio.

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Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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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.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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