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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | Total | Preferred stock [Member] | Common stock and additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income [Member]
--- | --- | --- | --- | --- | ---
Balance, beginning balance at Dec. 31, 2011 | $ 150,858 | $ 12,303 | $ 45,927 | $ 85,314 | $ 7,314
Balance, beginning period (in shares) at Dec. 31, 2011 |  |  | 9,812,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 2,913 |  |  | 2,913 |
Net unrealized loss on securities available for sale, net of tax | (313) |  |  |  | (313)
Amortization of unrecognized transition obligation for postretirement benefits, net of tax | 5 |  |  |  | 5
Comprehensive income | 2,605 |  |  | 2,913 | (308)
Cash dividends declared (2012: 0.195 per share, 2013: $0.195 per shares) | (2,077) |  |  | (2,077) |
Equity compensation expense | 24 |  | 24 |  |
Amortization of premium for preferred stock issuance |  | 25 | (25) |  |
Proceeds from sale of common stock (in shares) |  |  | 28,000 |  |
Proceeds from sale of common stock | 183 |  | 183 |  |
Balance, ending period at Mar. 31, 2012 | 151,593 | 12,328 | 46,109 | 86,150 | 7,006
Balance, ending balance (in shares) at Mar. 31, 2012 | 9,839,760 |  | 9,840,000 |  |
Balance, beginning balance at Dec. 31, 2012 | 156,323 | 12,402 | 46,412 | 89,692 | 7,817
Balance, beginning period (in shares) at Dec. 31, 2012 | 9,859,914 |  | 9,860,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 2,856 |  |  | 2,856 |
Net unrealized loss on securities available for sale, net of tax | (2,466) |  |  |  | (2,466)
Amortization of unrecognized transition obligation for postretirement benefits, net of tax | 4 |  |  |  | 4
Comprehensive income | 394 |  |  | 2,856 | (2,462)
Cash dividends declared (2012: 0.195 per share, 2013: $0.195 per shares) | (2,249) |  |  | (2,249) |
Equity compensation expense | 54 |  | 54 |  |
Amortization of premium for preferred stock issuance |  | 24 | (24) |  |
Payment to repurchase preferred stock | (2,500) | (2,500) |  |  |
Proceeds from sale of common stock (in shares) |  |  | 794,000 |  |
Proceeds from sale of common stock | 11,649 |  | 11,649 |  |
Balance, ending period at Mar. 31, 2013 | $ 163,671 | $ 9,926 | $ 58,091 | $ 90,299 | $ 5,355
Balance, ending balance (in shares) at Mar. 31, 2013 | 10,653,799 |  | 10,654,000 |  |

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