INVESTMENTS (Amortized Cost and Estimated Fair Values of Investments Available-for-sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 636,062	$ 581,162
Gross Unrealized Gains	19,739	14,833
Gross Unrealized Losses	(159)	(3,946)
Estimated Fair Value	655,642	592,049
Marketable Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,223	1,223
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,223	1,223
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	634,839	579,939
Gross Unrealized Gains	19,739	14,833
Gross Unrealized Losses	(159)	(3,946)
Estimated Fair Value	654,419	590,826
Debt Securities \| U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	54,742	109,602
Gross Unrealized Gains	22	132
Gross Unrealized Losses	0	(1,334)
Estimated Fair Value	54,764	108,400
Debt Securities \| State and municipal
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	284,830	156,402
Gross Unrealized Gains	12,987	8,305
Gross Unrealized Losses	(26)	0
Estimated Fair Value	297,791	164,707
Debt Securities \| Mortgage-Backed
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	285,078	312,846
Gross Unrealized Gains	6,484	6,396
Gross Unrealized Losses	(67)	(2,546)
Estimated Fair Value	291,495	316,696
Debt Securities \| Corporate Debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	9,100	0
Gross Unrealized Gains	246	0
Gross Unrealized Losses	0	0
Estimated Fair Value	9,346	0
Debt Securities \| Trust Preferred
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,089	1,089
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(66)	(66)
Estimated Fair Value	$ 1,023	$ 1,023

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=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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
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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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