INVESTMENTS (Amortized Cost and Estimated Fair Values of Investments Available-for-sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 685,099	$ 581,162
Gross Unrealized Gains	20,353	14,833
Gross Unrealized Losses	(580)	(3,946)
Estimated Fair Value	704,872	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	683,876	579,939
Gross Unrealized Gains	20,353	14,833
Gross Unrealized Losses	(580)	(3,946)
Estimated Fair Value	703,649	590,826
Debt Securities \| U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	126,341	109,602
Gross Unrealized Gains	157	132
Gross Unrealized Losses	(91)	(1,334)
Estimated Fair Value	126,407	108,400
Debt Securities \| State and municipal
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	297,455	156,402
Gross Unrealized Gains	14,172	8,305
Gross Unrealized Losses	(70)	0
Estimated Fair Value	311,557	164,707
Debt Securities \| Mortgage-Backed
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	256,891	312,846
Gross Unrealized Gains	5,967	6,396
Gross Unrealized Losses	(365)	(2,546)
Estimated Fair Value	262,493	316,696
Debt Securities \| Corporate Debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,100	0
Gross Unrealized Gains	57	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,157	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	(54)	(66)
Estimated Fair Value	$ 1,035	$ 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=51813488&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
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&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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-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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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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-SubTopic 10
-Section S99
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