SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	$ 30,187	$ 30,154
Securities—trading	24,753	24,568
Available-for-sale Securities, Amortized Cost	1,226,747	806,336
Available-for-sale Securities, Gross Unrealized Gains	4,107	2,752
Available-for-sale Securities, Gross Unrealized Losses	(7,090)	(8,171)
Securities—available-for-sale	1,223,764	800,917
Held-to-maturity Securities, Amortized Cost	266,391	267,873
Held-to-maturity Securities, Gross Unrealized Gains	4,684	4,482
Held-to-maturity Securities, Gross Unrealized Losses	1,673	1,827
Securities—held-to-maturity	269,402	270,528
U.S. Government and agency obligations [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	1,230	1,230
Securities—trading	1,322	1,326
Available-for-sale Securities, Amortized Cost	90,843	57,288
Available-for-sale Securities, Gross Unrealized Gains	236	146
Available-for-sale Securities, Gross Unrealized Losses	(407)	(456)
Securities—available-for-sale	90,672	56,978
Held-to-maturity Securities, Amortized Cost	1,055	1,065
Held-to-maturity Securities, Gross Unrealized Gains	0	0
Held-to-maturity Securities, Gross Unrealized Losses	11	18
Securities—held-to-maturity	1,044	1,047
Municipal bonds [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	331	331
Securities—trading	334	335
Available-for-sale Securities, Amortized Cost	110,543	110,487
Available-for-sale Securities, Gross Unrealized Gains	793	455
Available-for-sale Securities, Gross Unrealized Losses	(791)	(1,089)
Securities—available-for-sale	110,545	109,853
Held-to-maturity Securities, Amortized Cost	196,224	196,989
Held-to-maturity Securities, Gross Unrealized Gains	4,483	4,173
Held-to-maturity Securities, Gross Unrealized Losses	1,173	1,272
Securities—held-to-maturity	199,534	199,890
Corporate bonds [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	27,002	26,959
Securities—trading	21,361	21,143
Available-for-sale Securities, Amortized Cost	10,535	10,255
Available-for-sale Securities, Gross Unrealized Gains	70	77
Available-for-sale Securities, Gross Unrealized Losses	(47)	(49)
Securities—available-for-sale	10,558	10,283
Held-to-maturity Securities, Amortized Cost	3,839	3,876
Held-to-maturity Securities, Gross Unrealized Gains	0	0
Held-to-maturity Securities, Gross Unrealized Losses	0	0
Securities—held-to-maturity	3,839	3,876
Mortgage-backed or related securities [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	1,610	1,620
Securities—trading	1,617	1,641
Available-for-sale Securities, Amortized Cost	986,010	598,899
Available-for-sale Securities, Gross Unrealized Gains	2,961	2,064
Available-for-sale Securities, Gross Unrealized Losses	(5,773)	(6,251)
Securities—available-for-sale	983,198	594,712
Held-to-maturity Securities, Amortized Cost	65,273	65,943
Held-to-maturity Securities, Gross Unrealized Gains	201	309
Held-to-maturity Securities, Gross Unrealized Losses	489	537
Securities—held-to-maturity	64,985	65,715
Asset-backed Securities [Member]
Schedule of Securities [Line Items]
Available-for-sale Securities, Amortized Cost	28,728	29,319
Available-for-sale Securities, Gross Unrealized Gains	37	0
Available-for-sale Securities, Gross Unrealized Losses	(72)	(326)
Securities—available-for-sale	28,693	28,993
Equity securities [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	14	14
Securities—trading	119	123
Available-for-sale Securities, Amortized Cost	88	88
Available-for-sale Securities, Gross Unrealized Gains	10	10
Available-for-sale Securities, Gross Unrealized Losses	0	0
Securities—available-for-sale	$ 98	$ 98