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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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