Investments (Gross Unrealized Losses and Fair Value by Length of Time for Held-To-Maturity Securities) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Held To Maturity Securities [Line Items]
Fair Value	$ 64,008,000	$ 94,805,000
Less than 12 months	204,000	18,000
More than 12 months	677,000	2,041,000
Total Unrealized Losses	881,000	2,059,000
Held-to-Maturity Securities
Schedule Of Held To Maturity Securities [Line Items]
Number of securities	25	49
U.S. government agencies
Schedule Of Held To Maturity Securities [Line Items]
Fair Value	45,766,000	62,778,000
Less than 12 months	178,000	0
More than 12 months	519,000	1,734,000
Total Unrealized Losses	697,000	1,734,000
U.S. government agencies \| Held-to-Maturity Securities
Schedule Of Held To Maturity Securities [Line Items]
Number of securities	5	8
State and municipal
Schedule Of Held To Maturity Securities [Line Items]
Fair Value	18,242,000	32,027,000
Less than 12 months	26,000	18,000
More than 12 months	158,000	307,000
Total Unrealized Losses	$ 184,000	$ 325,000
State and municipal \| Held-to-Maturity Securities
Schedule Of Held To Maturity Securities [Line Items]
Number of securities	20	41

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity 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

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-Name Accounting Standards Codification

-Topic 320

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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