SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Trading:
Trading Securities, Amortized Cost	$ 30,154	$ 39,344
Trading Securities, Fair Value	24,568	34,134
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	806,336	1,139,740
Gross Unrealized Gains	2,752	5,188
Gross Unrealized Losses	(8,171)	(6,355)
Securities—available-for-sale	800,917	1,138,573
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	267,873	220,666
Gross Unrealized Gains	4,482	6,477
Gross Unrealized Losses	(1,827)	(516)
Held-to-maturity Securities, Fair Value	270,528	226,627
U.S. Government and agency obligations
Trading:
Trading Securities, Amortized Cost	1,230	1,230
Trading Securities, Fair Value	1,326	1,368
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	57,288	30,211
Gross Unrealized Gains	146	213
Gross Unrealized Losses	(456)	(193)
Securities—available-for-sale	56,978	30,231
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	1,065	1,106
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(18)	0
Held-to-maturity Securities, Fair Value	1,047	1,111
Municipal bonds
Trading:
Trading Securities, Amortized Cost	331	332
Trading Securities, Fair Value	335	341
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	110,487	142,898
Gross Unrealized Gains	455	853
Gross Unrealized Losses	(1,089)	(432)
Securities—available-for-sale	109,853	143,319
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	196,989	162,778
Gross Unrealized Gains	4,173	6,219
Gross Unrealized Losses	(1,272)	(191)
Held-to-maturity Securities, Fair Value	199,890	168,806
Corporate bonds
Trading:
Trading Securities, Amortized Cost	26,959	25,063
Trading Securities, Fair Value	21,143	18,699
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	10,255	15,937
Gross Unrealized Gains	77	56
Gross Unrealized Losses	(49)	(12)
Securities—available-for-sale	10,283	15,981
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	3,876	4,273
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Held-to-maturity Securities, Fair Value	3,876	4,273
Mortgage-backed or related securities
Trading:
Trading Securities, Amortized Cost	1,620	12,705
Trading Securities, Fair Value	1,641	13,663
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	598,899	919,318
Gross Unrealized Gains	2,064	4,056
Gross Unrealized Losses	(6,251)	(5,115)
Securities—available-for-sale	594,712	918,259
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	65,943	52,509
Gross Unrealized Gains	309	253
Gross Unrealized Losses	(537)	(325)
Held-to-maturity Securities, Fair Value	65,715	52,437
Asset-backed securities
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	29,319	31,288
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(326)	(603)
Securities—available-for-sale	28,993	30,685
Equity securities
Trading:
Trading Securities, Amortized Cost	14	14
Trading Securities, Fair Value	123	63
Available-for-Sale:
Available-for-sale Securities, Amortized Cost	88	88
Gross Unrealized Gains	10	10
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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