INVESTMENTS (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Detail) $ in Thousands	Dec. 31, 2016 USD ($) Securities	Dec. 31, 2015 USD ($) Securities
Schedule Of Available For Sale Securities [Line Items]
Number of Securities \| Securities	103	34
Fair Value	$ 358,654	$ 220,134
Less than 12 months	7,043	1,736
More than 12 months	345	2,210
Total Unrealized Losses	$ 7,388	$ 3,946
Us Government Agencies Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of Securities \| Securities	12	7
Fair Value	$ 96,788	$ 78,555
Less than 12 months	2,556	1,020
More than 12 months	0	314
Total Unrealized Losses	$ 2,556	$ 1,334
U S States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of Securities \| Securities	53	0
Fair Value	$ 48,010	$ 0
Less than 12 months	516	0
More than 12 months	70	0
Total Unrealized Losses	$ 586	$ 0
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of Securities \| Securities	37	26
Fair Value	$ 212,844	$ 140,556
Less than 12 months	3,971	716
More than 12 months	198	1,830
Total Unrealized Losses	$ 4,169	$ 2,546
Trust Preferred Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of Securities \| Securities	1	1
Fair Value	$ 1,012	$ 1,023
Less than 12 months	0	0
More than 12 months	77	66
Total Unrealized Losses	$ 77	$ 66

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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