SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 88,089	$ 236,283
Gross Unrealized Gains	7,151	9,554
Gross Unrealized Losses	0	(496)
Estimated Fair Value	95,240	245,341
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	88,089	236,283
Gross Unrealized Gains	7,151	9,554
Gross Unrealized Losses	0	(496)
Estimated Fair Value	$ 95,240	$ 245,341

Amount of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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