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Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest Income | $ 15,373,000 | $ 14,667,000 | $ 13,992,000 | $ 14,209,000 | $ 14,666,000 | $ 14,768,000 | $ 14,930,000 | $ 15,553,000 | $ 58,242,000 | $ 59,917,000 | $ 71,069,000
Net Interest Income | 12,695,000 | 11,994,000 | 11,312,000 | 11,454,000 | 11,737,000 | 11,584,000 | 11,511,000 | 11,869,000 | 47,456,000 | 46,701,000 | 51,237,000
Net income attributable to common shares | $ 5,163,000 | $ 3,453,000 | $ 4,016,000 | $ 4,400,000 | $ 3,049,000 | $ 2,616,000 | $ 3,288,000 | $ 2,552,000 | $ 17,033,000 | $ 11,505,000 | $ 36,142,000
Earnings per Share Basic | $ 0.59 | $ 0.40 | $ 0.46 | $ 0.51 | $ 0.35 | $ 0.30 | $ 0.38 | $ 0.30 | $ 1.96 | $ 1.33 | $ 4.20
Earnings per Share Diluted | $ 0.59 | $ 0.40 | $ 0.46 | $ 0.50 | $ 0.35 | $ 0.30 | $ 0.36 | $ 0.28 | $ 1.95 | $ 1.30 | $ 4.07

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