FAIR VALUE - Reconciliation Of Gains and Losses on Level 3 Assets - (Details) - Significant Unobservable Inputs (Level 3) - Recurring basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
State and municipal
Reconciliation and income statement classification of gains and losses
Balance at the beginning of the period	$ 10,120	$ 10,858
Included in other comprehensive income	(5)	(1)
Settlements	(778)	(737)
Balance at the end of the period	9,337	10,120
Other securities
Reconciliation and income statement classification of gains and losses
Balance at the beginning of the period	6,598	6,524
Purchases	505
Settlement through acquisition	(1,590)
Settlements	(500)	74
Balance at the end of the period	$ 5,013	$ 6,598