FAIR VALUE - Reconciliation Of Gains and Losses on Level 3 Assets - (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
State and municipal | Recurring basis
Reconciliation and income statement classification of gains and losses
Balance at the beginning of the period	$ 9,674	$ 10,429	$ 10,120	$ 10,858
Included in other comprehensive income	(2)	1	(5)	2
Settlements			(443)	(430)
Balance at the end of the period	9,672	10,430	9,672	10,430
Other securities
Reconciliation and income statement classification of gains and losses
Balance at the beginning of the period		6,523
Included in other comprehensive income		78
Balance at the end of the period		6,601		6,601
Other securities | Recurring basis
Reconciliation and income statement classification of gains and losses
Balance at the beginning of the period	6,603		6,598	6,524
Included in other comprehensive income	(4)		1	77
Purchases	(1,590)
Settlements			(1,590)
Balance at the end of the period	$ 5,009	$ 6,601	$ 5,009	$ 6,601