Fair Value Disclosures - Assets, Liabilities and Off-Balance Sheet Items Not Measured at Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deposits:
Time deposits	$ 331,511	$ 408,500
Carrying Amount [Member]
Assets:
Cash and short-term interest-earning assets	146,112	107,377
Held-to-maturity securities	69,845	45,804
Loans held for sale	4,530	3,157
Net loans and leases held for investment	1,457,116	1,416,536
Total assets	1,677,603	1,572,874
Deposits:
Demand and savings deposits, non-maturity	1,533,822	1,340,732
Time deposits	331,511	408,500
Total deposits	1,865,333	1,749,232
Short-term borrowings	96,282	109,740
Long-term borrowings	20,994	27,494
Total Liabilities	1,982,609	1,886,466
Off-Balance-Sheet:
Commitments to extend credit
Fair Value [Member]
Assets:
Cash and short-term interest-earning assets	146,112	107,377
Held-to-maturity securities	71,327	45,639
Loans held for sale	4,653	3,255
Net loans and leases held for investment	1,478,966	1,453,129
Total assets	1,701,058	1,609,400
Deposits:
Demand and savings deposits, non-maturity	1,533,822	1,340,732
Time deposits	334,164	411,818
Total deposits	1,867,986	1,752,550
Short-term borrowings	94,066	106,677
Long-term borrowings	20,965	27,654
Total Liabilities	1,983,017	1,886,881
Off-Balance-Sheet:
Commitments to extend credit	(1,286)	(1,227)
Fair Value [Member] \| Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	146,112	107,377
Held-to-maturity securities
Loans held for sale
Net loans and leases held for investment
Total assets	146,112	107,377
Deposits:
Demand and savings deposits, non-maturity	1,533,822	1,340,732
Time deposits
Total deposits	1,533,822	1,340,732
Short-term borrowings
Long-term borrowings
Total Liabilities	1,533,822	1,340,732
Off-Balance-Sheet:
Commitments to extend credit
Fair Value [Member] \| Level 2 [Member]
Assets:
Cash and short-term interest-earning assets
Held-to-maturity securities	71,327	45,639
Loans held for sale	4,653	3,255
Net loans and leases held for investment
Total assets	75,980	48,894
Deposits:
Demand and savings deposits, non-maturity
Time deposits	334,164	411,818
Total deposits	334,164	411,818
Short-term borrowings	94,066	106,677
Long-term borrowings	20,965	27,654
Total Liabilities	449,195	546,149
Off-Balance-Sheet:
Commitments to extend credit	(1,286)	(1,227)
Fair Value [Member] \| Level 3 [Member]
Assets:
Cash and short-term interest-earning assets
Held-to-maturity securities
Loans held for sale
Net loans and leases held for investment	1,478,966	1,453,129
Total assets	1,478,966	1,453,129
Deposits:
Demand and savings deposits, non-maturity
Time deposits
Total deposits
Short-term borrowings
Long-term borrowings
Total Liabilities
Off-Balance-Sheet:
Commitments to extend credit

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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)

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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8

-Footnote 2

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-Name Accounting Standards Codification

-Glossary Cash

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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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.

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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)

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This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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The fair value amount of long-term debt 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.

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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.

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-Publisher FASB

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-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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