INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Held to Maturity
Amortized cost	$ 217,668	$ 247,917
Gross unrealized gains	92	123
Gross unrealized losses	(3,394)	(3,904)
Estimated fair value	214,366	244,136
Available for Sale
Amortized cost	1,246,728	1,267,503
Gross unrealized gains	9,784	13,615
Gross unrealized losses	(12,665)	(8,863)
Available for sale, at fair value	1,243,847	1,272,255
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]
Held to Maturity
Amortized cost		152,315
Residential-U.S. Government sponsored entities
Held to Maturity
Amortized cost	124,082
Gross unrealized gains	92	123
Gross unrealized losses	(2,474)	(2,915)
Estimated fair value	121,700	149,523
Available for Sale
Amortized cost	775,803	771,657
Gross unrealized gains	3,698	5,885
Gross unrealized losses	(9,515)	(5,633)
Available for sale, at fair value	769,986	771,909
Mortgage Backed Securities Commercial U S Government Sponsored Entities [Member]
Held to Maturity
Amortized cost		95,602
Commercial-U.S. Government sponsored entities
Held to Maturity
Amortized cost	93,586
Gross unrealized gains	0	0
Gross unrealized losses	(920)	(989)
Estimated fair value	92,666	94,613
Available for Sale
Amortized cost	135,248	135,439
Gross unrealized gains	2,387	2,033
Gross unrealized losses	(411)	(1,118)
Available for sale, at fair value	137,224	136,354
States and political subdivisions
Available for Sale
Amortized cost	184,836	187,552
Gross unrealized gains	2,002	3,819
Gross unrealized losses	(1,797)	(898)
Available for sale, at fair value	185,041	190,473
Corporate securities
Available for Sale
Amortized cost	98,596	107,721
Gross unrealized gains	974	1,077
Gross unrealized losses	(181)	(227)
Available for sale, at fair value	99,389	108,571
Residential - Non-government sponsored entities
Available for Sale
Amortized cost	51,681	64,286
Gross unrealized gains	627	733
Gross unrealized losses	(761)	(987)
Available for sale, at fair value	51,547	64,032
Other
Available for Sale
Amortized cost	564	848
Gross unrealized gains	96	68
Gross unrealized losses	0	0
Available for sale, at fair value	$ 660	$ 916

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

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-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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