INVESTMENTS (Amortized Cost and Estimated Fair Values of Investments Available-for-sale) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 581,162	$ 658,802
Gross Unrealized Gains	14,833	19,277
Gross Unrealized Losses	(3,946)	(5,870)
Estimated Fair Value	592,049	672,209
Marketable Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,223	723
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,223	723
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	579,939	658,079
Gross Unrealized Gains	14,833	19,277
Gross Unrealized Losses	(3,946)	(5,870)
Estimated Fair Value	590,826	671,486
Debt Securities \| U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	109,602	144,497
Gross Unrealized Gains	132	0
Gross Unrealized Losses	(1,334)	(2,818)
Estimated Fair Value	108,400	141,679
Debt Securities \| State and municipal
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	156,402	157,603
Gross Unrealized Gains	8,305	9,453
Gross Unrealized Losses	0	(4)
Estimated Fair Value	164,707	167,052
Debt Securities \| Mortgage-Backed
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	312,846	354,631
Gross Unrealized Gains	6,396	9,824
Gross Unrealized Losses	(2,546)	(2,936)
Estimated Fair Value	316,696	361,519
Debt Securities \| Trust Preferred
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,089	1,348
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(66)	(112)
Estimated Fair Value	$ 1,023	$ 1,236

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
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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