Investments (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 194,845,000	$ 253,226,000
Less than 12 months	340,000	122,000
More than 12 months	2,175,000	5,748,000
Total Unrealized Losses	2,515,000	5,870,000
Available-for-Sale Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities	27	37
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Fair Value	94,083,000	141,679,000
Less than 12 months	244,000	60,000
More than 12 months	633,000	2,758,000
Total Unrealized Losses	877,000	2,818,000
U.S. Government Agencies \| Available-for-Sale Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities	9	14
State and municipal
Schedule Of Available For Sale Securities [Line Items]
Fair Value	0	1,409,000
Less than 12 months	0	4,000
More than 12 months	0	0
Total Unrealized Losses	0	4,000
State and municipal \| Available-for-Sale Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities	0	2
Mortgage-Backed
Schedule Of Available For Sale Securities [Line Items]
Fair Value	99,760,000	108,902,000
Less than 12 months	96,000	58,000
More than 12 months	1,433,000	2,878,000
Total Unrealized Losses	1,529,000	2,936,000
Mortgage-Backed \| Available-for-Sale Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities	17	20
Trust Preferred
Schedule Of Available For Sale Securities [Line Items]
Fair Value	1,002,000	1,236,000
Less than 12 months	0	0
More than 12 months	109,000	112,000
Total Unrealized Losses	$ 109,000	$ 112,000
Trust Preferred \| Available-for-Sale Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities	1	1

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- Definition

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.

+ 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=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

-Paragraph 6

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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.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

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