INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 816,680	$ 824,635
Gross Unrealized Gains	6,555	5,493
Gross Unrealized Losses	(4,542)	(7,393)
Estimated Fair Value	818,693	822,735
U.S. government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	999
Gross Unrealized Gains	9	21
Gross Unrealized Losses	0	0
Estimated Fair Value	1,009	1,020
State, county and municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	142,028	149,899
Gross Unrealized Gains	3,166	2,605
Gross Unrealized Losses	(86)	(469)
Estimated Fair Value	145,108	152,035
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	47,252	32,375
Gross Unrealized Gains	552	167
Gross Unrealized Losses	(192)	(370)
Estimated Fair Value	47,612	32,172
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	626,400	641,362
Gross Unrealized Gains	2,828	2,700
Gross Unrealized Losses	(4,264)	(6,554)
Estimated Fair Value	$ 624,964	$ 637,508

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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