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Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Securities [Abstract] |
Amortized cost and fair value of available for sale securities and related pre-tax gross unrealized gains and losses |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 78,447,000 |  |  | $ | 1,039,000 |  |  | $ | (388,000 | ) |  | $ | 79,098,000 |
Mortgage-backed securities |  |  | 20,182,000 |  |  |  | 1,814,000 |  |  |  | 0 |  |  |  | 21,996,000 |
Michigan Strategic Fund bonds |  |  | 11,255,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 11,255,000 |
Municipal general obligation bonds |  |  | 21,700,000 |  |  |  | 1,043,000 |  |  |  | 0 |  |  |  | 22,743,000 |
Municipal revenue bonds |  |  | 1,726,000 |  |  |  | 91,000 |  |  |  | 0 |  |  |  | 1,817,000 |
Mutual funds |  |  | 1,354,000 |  |  |  | 51,000 |  |  |  | 0 |  |  |  | 1,405,000 |
|  | $ | 134,664,000 |  |  | $ | 4,038,000 |  |  | $ | (388,000 | ) |  | $ | 138,314,000 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 86,783,000 |  |  | $ | 1,872,000 |  |  | $ | (59,000 | ) |  | $ | 88,596,000 |
Mortgage-backed securities |  |  | 31,851,000 |  |  |  | 2,759,000 |  |  |  | 0 |  |  |  | 34,610,000 |
Michigan Strategic Fund bonds |  |  | 16,700,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 16,700,000 |
Municipal general obligation bonds |  |  | 26,212,000 |  |  |  | 1,097,000 |  |  |  | 0 |  |  |  | 27,309,000 |
Municipal revenue bonds |  |  | 4,300,000 |  |  |  | 123,000 |  |  |  | 0 |  |  |  | 4,423,000 |
Mutual funds |  |  | 1,312,000 |  |  |  | 42,000 |  |  |  | 0 |  |  |  | 1,354,000 |
|  | $ | 167,158,000 |  |  | $ | 5,893,000 |  |  | $ | (59,000 | ) |  | $ | 172,992,000 |
Securities with unrealized losses aggregated by investment category and length of time |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
Description of Securities |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 33,555,000 |  |  | $ | (388,000 | ) |  | $ | 0 |  |  | $ | 0 |  |  | $ | 33,555,000 |  |  | $ | (388,000 | )
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Michigan Strategic Fund bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal general obligation bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Mutual funds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 33,555,000 |  |  | $ | (388,000 | ) |  | $ | 0 |  |  | $ | 0 |  |  | $ | 33,555,000 |  |  | $ | (388,000 | )
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 9,765,000 |  |  | $ | (33,000 | ) |  | $ | 9,526,000 |  |  | $ | (26,000 | ) |  | $ | 19,291,000 |  |  | $ | (59,000 | )
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Michigan Strategic Fund bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal general obligation bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Mutual funds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 9,765,000 |  |  | $ | (33,000 | ) |  | $ | 9,526,000 |  |  | $ | (26,000 | ) |  | $ | 19,291,000 |  |  | $ | (59,000 | )
Maturities of securities and their weighted average yields |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  |  | 5.35 | % |  | $ | 1,998,000 |  |  | $ | 2,033,000 |
Due from one to five years |  |  | 5.79 |  |  |  | 3,649,000 |  |  |  | 3,841,000 |
Due from five to ten years |  |  | 3.09 |  |  |  | 26,765,000 |  |  |  | 27,029,000 |
Due after ten years |  |  | 4.22 |  |  |  | 69,461,000 |  |  |  | 70,755,000 |
Mortgage-backed securities |  |  | 5.19 |  |  |  | 20,182,000 |  |  |  | 21,996,000 |
Michigan Strategic Fund bonds |  |  | 1.74 |  |  |  | 11,255,000 |  |  |  | 11,255,000 |
Mutual funds |  |  | 3.03 |  |  |  | 1,354,000 |  |  |  | 1,405,000 |
|  |  | 4.00 | % |  | $ | 134,664,000 |  |  | $ | 138,314,000 |

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