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Investment securities available-for-sale (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 121,688 | $ 134,376
Gross Unrealized Gains | 7,696 | 7,072
Gross Unrealized Losses | 788 | 1,549
Fair Value | 128,596 | 139,899
Maturity distribution of debt securities classified as available-for-sale [Abstract] |  |
Within one year | 250 |
After one but within five years | 14,855 |
After five but within ten years | 35,483 |
After ten years | 39,897 |
Total debt securities with maturity date | 90,485 |
Mortgage-backed securities | 37,641 |
Total | 128,126 |
Carrying value of securities pledged | 89,099 | 105,135
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
Less than 12 Months, Fair Value | 14,008 | 34,722
12 Months or More, Fair Value | 8,267 | 5,184
Total, Fair Value | 22,275 | 39,906
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 108 | 399
12 Months or More, Unrealized Losses | 680 | 1,150
Total, Unrealized Losses | 788 | 1,549
Number of investment securities held | 20 | 31
U.S. Government-sponsored enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 29,524 | 29,671
Gross Unrealized Gains | 3,491 | 3,105
Fair Value | 33,015 | 32,776
State and municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,623 | 18,120
Gross Unrealized Gains | 1,859 | 1,608
Fair Value | 18,482 | 19,728
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Number of securities in continuous unrealized loss position 12 months or longer | 1 | 4
State and municipals, Tax-exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 33,551 | 38,217
Gross Unrealized Gains | 1,955 | 1,693
Gross Unrealized Losses | 9 | 224
Fair Value | 35,497 | 39,686
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
Less than 12 Months, Fair Value | 1,176 | 1,142
12 Months or More, Fair Value | 300 | 2,859
Total, Fair Value | 1,476 | 4,001
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 6 | 39
12 Months or More, Unrealized Losses | 3 | 185
Total, Unrealized Losses | 9 | 224
Number of investment securities held | 3 | 6
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,040 | 4,462
Gross Unrealized Gains | 45 | 330
Gross Unrealized Losses | 594 | 942
Fair Value | 3,491 | 3,850
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
Less than 12 Months, Fair Value |  | 970
12 Months or More, Fair Value | 2,417 | 2,130
Total, Fair Value | 2,417 | 3,100
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Less than 12 Months, Unrealized Losses |  | 61
12 Months or More, Unrealized Losses | 594 | 881
Total, Unrealized Losses | 594 | 942
Number of investment securities held | 2 | 3
Number of securities in continuous unrealized loss position 12 months or longer | 2 | 2
Mortgage-backed securities, U.S. Government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,288 | 16,827
Gross Unrealized Gains | 189 | 185
Gross Unrealized Losses | 30 | 100
Fair Value | 15,447 | 16,912
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
Less than 12 Months, Fair Value | 3,538 | 10,785
12 Months or More, Fair Value | 2,801 |
Total, Fair Value | 6,339 | 10,785
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 13 | 100
12 Months or More, Unrealized Losses | 17 |
Total, Unrealized Losses | 30 | 100
Number of investment securities held | 13 | 18
Number of securities in continuous unrealized loss position 12 months or longer | 4 |
Mortgage-backed securities, U.S. Government-sponsored enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,175 | 26,396
Gross Unrealized Gains | 135 | 66
Gross Unrealized Losses | 116 | 199
Fair Value | 22,194 | 26,263
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
Less than 12 Months, Fair Value | 9,294 | 21,825
12 Months or More, Fair Value | 2,651 |
Total, Fair Value | 11,945 | 21,825
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
Less than 12 Months, Unrealized Losses | 89 | 199
12 Months or More, Unrealized Losses | 27 |
Total, Unrealized Losses | 116 | 199
Equity securities, Preferred [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 54
Gross Unrealized Gains |  | 63
Fair Value |  | 117
Equity securities, Common [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 487 | 629
Gross Unrealized Gains | 22 | 22
Gross Unrealized Losses | 39 | 84
Fair Value | 470 | 567
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract] |  |
12 Months or More, Fair Value | 98 | 195
Total, Fair Value | 98 | 195
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract] |  |
12 Months or More, Unrealized Losses | 39 | 84
Total, Unrealized Losses | $ 39 | $ 84
Number of investment securities held | 2 | 4
Number of securities in continuous unrealized loss position 12 months or longer | 2 |

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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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -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. + Details
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- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph i -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 + Details
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