Fair Value Measurement - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial Assets:
Securities available for sale	$ 200,356	$ 203,961
Carrying Amount [Member]
Financial Assets:
Cash and due from financial institutions	50,093	46,131
Securities available for sale	200,356	203,961
Other securities	15,433	15,567
Loans, available for sale	4,891	1,873
Loans, net of allowance for loan losses	802,274	795,811
Bank owned life insurance	19,013	18,590
Accrued interest receivable	4,540	3,709
Mortgage servicing rights	454	308
Financial Liabilities:
Nonmaturing deposits	702,215	662,387
Time deposits	240,243	264,002
Federal Home Loan Bank advances	37,735	40,261
Securities sold under agreement to repurchase	20,810	23,219
Subordinated debentures	29,427	29,427
Accrued interest payable	159	185
Total Fair Value [Member]
Financial Assets:
Cash and due from financial institutions	50,093	46,131
Securities available for sale	200,356	203,961
Other securities	15,433	15,567
Loans, available for sale	4,891	1,873
Loans, net of allowance for loan losses	821,717	812,950
Bank owned life insurance	19,013	18,590
Accrued interest receivable	4,540	3,709
Mortgage servicing rights	454	308
Financial Liabilities:
Nonmaturing deposits	702,215	662,387
Time deposits	242,067	265,974
Federal Home Loan Bank advances	38,710	41,658
Securities sold under agreement to repurchase	20,810	23,219
Subordinated debentures	21,412	26,855
Accrued interest payable	159	185
(Level 1) [Member]
Financial Assets:
Cash and due from financial institutions	50,093	46,131
Securities available for sale
Other securities	15,433	15,567
Loans, available for sale	4,891	1,873
Loans, net of allowance for loan losses
Bank owned life insurance	19,013	18,590
Accrued interest receivable	4,540	3,709
Mortgage servicing rights
Financial Liabilities:
Nonmaturing deposits	702,215	662,387
Time deposits
Federal Home Loan Bank advances
Securities sold under agreement to repurchase	20,810	23,219
Subordinated debentures
Accrued interest payable	159	185
(Level 2) [Member]
Financial Assets:
Cash and due from financial institutions
Securities available for sale	200,356	203,493
Other securities
Loans, available for sale
Loans, net of allowance for loan losses
Bank owned life insurance
Accrued interest receivable
Mortgage servicing rights
Financial Liabilities:
Nonmaturing deposits
Time deposits
Federal Home Loan Bank advances
Securities sold under agreement to repurchase
Subordinated debentures
Accrued interest payable
(Level 3) [Member]
Financial Assets:
Cash and due from financial institutions
Securities available for sale		468
Other securities
Loans, available for sale
Loans, net of allowance for loan losses	821,717	812,950
Bank owned life insurance
Accrued interest receivable
Mortgage servicing rights	454	308
Financial Liabilities:
Nonmaturing deposits
Time deposits	242,067	265,974
Federal Home Loan Bank advances	38,710	41,658
Securities sold under agreement to repurchase
Subordinated debentures	21,412	26,855
Accrued interest payable

Accrued interest payable fair value disclosure.

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Accrued interest receivable fair value disclosure.

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No definition available.

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- Definition

Bank owned life insurance fair value disclosure.

+ References

No definition available.

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Cash and due from financial institutions fair value disclosure.

+ References

No definition available.

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- Definition

Loans and leases receivable fair value disclosure.

+ References

No definition available.

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- Definition

Nonmaturing deposits fair value disclosure.

+ References

No definition available.

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- Definition

Other marketable securities current fair value disclosure.

+ References

No definition available.

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- Definition

Time deposits fair value disclosure.

+ References

No definition available.

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- 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

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-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

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-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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- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13(3)(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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