INVESTMENT SECURITIES - Realized Gains and Losses on Sales of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross realized gains and losses
Gross realized gains	$ 2,711	$ 4,298	$ 3,147
Gross realized losses	119	783	730
U.S. Government and agency securities
Gross realized gains and losses
Gross realized gains	0	59	0
Gross realized losses	0	45	0
Mortgage-backed securities
Gross realized gains and losses
Gross realized gains	0	89	0
Gross realized losses	0	0	92
State and political securities
Gross realized gains and losses
Gross realized gains	1,571	2,327	2,076
Gross realized losses	22	412	611
Other debt securities
Gross realized gains and losses
Gross realized gains	825	622	490
Gross realized losses	54	209	27
Financial institution equity securities
Gross realized gains and losses
Gross realized gains	183	710	241
Gross realized losses	0	0	0
Other equity securities
Gross realized gains and losses
Gross realized gains	132	491	340
Gross realized losses	$ 43	$ 117	$ 0