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Fair Value Disclosures - Summary of Assets Measured at Estimated Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	$ 431,786	$ 406,943
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	431,786	406,943
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	431,717	406,874
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	24,983	25,451
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	23,813	13,714
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	64,769	71,544
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	159,200	198,619
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	95,208	40,532
Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	63,744	57,014
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	69	69
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	431,786	406,943
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	431,786	406,943
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	431,717	406,874
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	24,983	25,451
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	23,813	13,714
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	64,769	71,544
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	159,200	198,619
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	95,208	40,532
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	63,744	57,014
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	69	69
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | U.S. Government Sponsored Enterprises (GSE) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Total Debt Securities [Member] | GSE Commercial CMOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	0	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	$ 0	$ 0

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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=28360136&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=6871852&loc=d3e26610-111562

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