Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets:
Held-to-maturity securities	$ 54,765,000	$ 66,853,000
Deposits:
Time deposits	252,593,000us-gaap_TimeDeposits	270,789,000us-gaap_TimeDeposits
Fair Value [Member]
Assets:
Cash and short-term interest-earning assets	38,565,000	69,169,000
Held-to-maturity securities	54,765,000	66,853,000
Loans held for sale	3,374,000	2,267,000
Net loans and leases held for investment	1,555,033,000	1,477,945,000
Mortgage servicing rights	6,941,000	7,188,000
Other real estate owned	955,000	1,650,000
Total assets	1,659,633,000	1,625,072,000
Deposits:
Demand and savings deposits, non-maturity	1,608,748,000	1,573,709,000
Time deposits	254,224,000	268,909,000
Total deposits	1,862,972,000	1,842,618,000
Short-term borrowings	38,631,000	35,687,000
Total liabilities	1,901,603,000	1,878,305,000
Off-Balance-Sheet:
Commitments to extend credit	(1,420,000)	(1,357,000)
Fair Value [Member] \| Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	38,565,000	69,169,000
Held-to-maturity securities	0	0
Loans held for sale	0	0
Net loans and leases held for investment	0	0
Mortgage servicing rights	0	0
Other real estate owned	0	0
Total assets	38,565,000	69,169,000
Deposits:
Demand and savings deposits, non-maturity	1,608,748,000	1,573,709,000
Time deposits	0	0
Total deposits	1,608,748,000	1,573,709,000
Short-term borrowings	0	0
Total liabilities	1,608,748,000	1,573,709,000
Off-Balance-Sheet:
Commitments to extend credit	0	0
Fair Value [Member] \| Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	54,765,000	66,853,000
Loans held for sale	3,374,000	2,267,000
Net loans and leases held for investment	0	0
Mortgage servicing rights	0	7,188,000
Other real estate owned	955,000	1,650,000
Total assets	59,094,000	77,958,000
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	254,224,000	268,909,000
Total deposits	254,224,000	268,909,000
Short-term borrowings	38,631,000	35,687,000
Total liabilities	292,855,000	304,596,000
Off-Balance-Sheet:
Commitments to extend credit	(1,420,000)	(1,357,000)
Fair Value [Member] \| Level 3 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	0	0
Loans held for sale	0	0
Net loans and leases held for investment	1,555,033,000	1,477,945,000
Mortgage servicing rights	6,941,000	0
Other real estate owned	0	0
Total assets	1,561,974,000	1,477,945,000
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	0	0
Total deposits	0	0
Short-term borrowings	0	0
Total liabilities	0	0
Off-Balance-Sheet:
Commitments to extend credit	0	0
Carrying Amount [Member]
Assets:
Cash and short-term interest-earning assets	38,565,000	69,169,000
Held-to-maturity securities	54,347,000	66,003,000
Loans held for sale	3,302,000	2,267,000
Net loans and leases held for investment	1,550,770,000	1,461,620,000
Mortgage servicing rights	5,509,000	5,519,000
Other real estate owned	955,000	1,650,000
Total assets	1,653,448,000	1,606,228,000
Deposits:
Demand and savings deposits, non-maturity	1,608,748,000	1,573,709,000
Time deposits	252,593,000	270,789,000
Total deposits	1,861,341,000	1,844,498,000
Short-term borrowings	41,974,000	37,256,000
Total liabilities	1,903,315,000	1,881,754,000
Off-Balance-Sheet:
Commitments to extend credit	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

+ References

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-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 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

-URI http://asc.fasb.org/extlink&oid=6517073

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Namespace Prefix:	us-gaap_
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ 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 210.9-03.12)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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- Definition

Mortgage servicing rights.

+ References

No definition available.

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- Definition

Other real estate owned fair value disclosure.

+ References

No definition available.

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