SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	$ 39,155	$ 39,344
Securities—trading	33,994	34,134
Available-for-sale Securities, Amortized Cost	1,186,995	1,139,740
Available-for-sale Securities, Gross Unrealized Gains	14,897	5,188
Available-for-sale Securities, Gross Unrealized Losses	(2,613)	(6,355)
Securities—available-for-sale	1,199,279	1,138,573
Held-to-maturity Securities, Amortized Cost	246,320	220,666
Held-to-maturity Securities, Gross Unrealized Gains	9,590	6,477
Held-to-maturity Securities, Gross Unrealized Losses	87	516
Securities—held-to-maturity	255,823	226,627
U.S. Government and agency obligations [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	1,230	1,230
Securities—trading	1,381	1,368
Available-for-sale Securities, Amortized Cost	52,009	30,211
Available-for-sale Securities, Gross Unrealized Gains	270	213
Available-for-sale Securities, Gross Unrealized Losses	(51)	(193)
Securities—available-for-sale	52,228	30,231
Held-to-maturity Securities, Amortized Cost	1,096	1,106
Held-to-maturity Securities, Gross Unrealized Gains	25	5
Held-to-maturity Securities, Gross Unrealized Losses	0	0
Securities—held-to-maturity	1,121	1,111
Municipal bonds [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	332	332
Securities—trading	339	341
Available-for-sale Securities, Amortized Cost	148,358	142,898
Available-for-sale Securities, Gross Unrealized Gains	2,884	853
Available-for-sale Securities, Gross Unrealized Losses	(39)	(432)
Securities—available-for-sale	151,203	143,319
Held-to-maturity Securities, Amortized Cost	172,968	162,778
Held-to-maturity Securities, Gross Unrealized Gains	8,169	6,219
Held-to-maturity Securities, Gross Unrealized Losses	41	191
Securities—held-to-maturity	181,096	168,806
Corporate bonds [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	26,828	25,063
Securities—trading	20,543	18,699
Available-for-sale Securities, Amortized Cost	15,747	15,937
Available-for-sale Securities, Gross Unrealized Gains	50	56
Available-for-sale Securities, Gross Unrealized Losses	(804)	(12)
Securities—available-for-sale	14,993	15,981
Held-to-maturity Securities, Amortized Cost	4,236	4,273
Held-to-maturity Securities, Gross Unrealized Gains	0	0
Held-to-maturity Securities, Gross Unrealized Losses	0	0
Securities—held-to-maturity	4,236	4,273
Mortgage-backed or related securities [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	10,751	12,705
Securities—trading	11,650	13,663
Available-for-sale Securities, Amortized Cost	939,515	919,318
Available-for-sale Securities, Gross Unrealized Gains	11,683	4,056
Available-for-sale Securities, Gross Unrealized Losses	(1,235)	(5,115)
Securities—available-for-sale	949,963	918,259
Held-to-maturity Securities, Amortized Cost	68,020	52,509
Held-to-maturity Securities, Gross Unrealized Gains	1,396	253
Held-to-maturity Securities, Gross Unrealized Losses	46	325
Securities—held-to-maturity	69,370	52,437
Asset-backed Securities [Member]
Schedule of Securities [Line Items]
Available-for-sale Securities, Amortized Cost	31,278	31,288
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	(484)	(603)
Securities—available-for-sale	30,794	30,685
Equity securities [Member]
Schedule of Securities [Line Items]
Securities—trading, Amortized Cost	14	14
Securities—trading	81	63
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

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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