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Borrowings - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 Quarters | Dec. 31, 2012 | Dec. 31, 2013 Federal Home Loan Bank Borrowings [Member] | Dec. 31, 2012 Federal Home Loan Bank Borrowings [Member] | Dec. 31, 2003 Trust [Member] | Dec. 31, 2013 Trust [Member] Unsecured Debt [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Federal Home Loan Bank Borrowings [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Federal Home Loan Bank Borrowings [Member] | Dec. 31, 2013 London Interbank Offered Rate (LIBOR) [Member]
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount available under FHLB |  |  | $ 37,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit with the FHLB |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Advances outstanding under line of credit |  |  | 0 | 0 |  |  |  |  |  |  |  |  |
FHLB advances Paid off during period | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rates ranges of FHLB | 4.41% |  |  |  |  |  | 0.77% |  |  | 3.69% |  |  |
Restructured interest rates ranges of FHLB |  |  |  |  |  |  |  |  | 0.77% |  |  | 2.19% |
Restructured FHLB advance | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Restructured interest rate | 2.19% |  |  |  |  |  |  |  |  |  |  |  |
Extension of maturity period | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Outstanding advances from the FHLB | 57,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rates of outstanding advances from FHLB |  |  |  |  |  |  | 0.19% | 0.19% |  | 1.17% | 1.17% |  |
Securities sold under Repurchase agreements | 0 | 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | 4.3475% | 4.3475% |  |  |  |  |  |  |  |  |  |  |
Securities sold under repurchase agreements | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Trust's common securities |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Trust preferred securities |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |
Tier I Capital |  |  |  |  | 25.00% |  |  |  |  |  |  |  |
Unsecured subordinated debentures |  |  |  |  |  | 8,248,000 |  |  |  |  |  |  |
Debt instrument interest rate description |  |  |  |  |  |  |  |  |  |  |  |  | Three-month LIBOR plus 3.15%
LIBOR interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.15%
Subordinated debentures, interest rate | 3.39585% |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of subordinated debentures |  |  |  |  |  | Mar. 26, 2033 |  |  |  |  |  |  |
Number of consecutive quarters for interest deferment | 20 |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest payable | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Duration of the Trust | 30 years |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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