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Business Segments (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 segment | Mar. 31, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 3,921,000 | $ 3,866,000 |
Provision for loan losses | 235,000 | 750,000 | 2,289,000
Net interest income after provision for loan losses | 3,686,000 | 3,116,000 |
Noninterest income | 964,000 | 671,000 |
Noninterest expense | 3,531,000 | 3,284,000 |
Income before income taxes | 1,119,000 | 503,000 |
Income tax expense | 331,000 | 143,000 |
Net income | 788,000 | 360,000 |
Total assets | 428,086,000 | 433,372,000 | 441,381,000
Number of reportable segments | 2 |  |
Community Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,921,000 | 3,866,000 |
Provision for loan losses | 235,000 | 750,000 |
Net interest income after provision for loan losses | 3,686,000 | 3,116,000 |
Noninterest income | 645,000 | 445,000 |
Noninterest expense | 3,278,000 | 3,089,000 |
Income before income taxes | 1,053,000 | 472,000 |
Income tax expense | 309,000 | 132,000 |
Net income | 744,000 | 340,000 |
Total assets | 427,233,000 | 432,291,000 |
Mortgage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Noninterest income | 319,000 | 226,000 |
Noninterest expense | 253,000 | 195,000 |
Income before income taxes | 66,000 | 31,000 |
Income tax expense | 22,000 | 11,000 |
Net income | 44,000 | 20,000 |
Total assets | $ 853,000 | $ 1,081,000 |

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