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Summarized Quarterly Financial Information (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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] |  |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability | $ 700,000 |  |  |  |  |  |  |  | $ 700,000 |  |
Interest income | 35,115,000 | 35,674,000 | 34,724,000 | 33,026,000 | 28,884,000 | 28,432,000 | 27,466,000 | 27,430,000 | 138,539,000 | 112,212,000 | 112,888,000
Taxable equivalent adjustment | 158,000 | 161,000 | 167,000 | 174,000 | 183,000 | 185,000 | 198,000 | 208,000 |  |  |
Interest income (FTE) | 35,273,000 | 35,835,000 | 34,891,000 | 33,200,000 | 29,067,000 | 28,617,000 | 27,664,000 | 27,638,000 |  |  |
Interest expense | 3,115,000 | 3,304,000 | 3,427,000 | 3,455,000 | 3,360,000 | 3,557,000 | 3,625,000 | 3,908,000 | 13,301,000 | 14,450,000 | 20,758,000
Net Interest Income | 32,158,000 | 32,531,000 | 31,464,000 | 29,745,000 | 25,707,000 | 25,060,000 | 24,039,000 | 23,730,000 |  |  |
Provision for loan losses | 1,945,000 | 1,154,000 | 2,011,000 | 1,738,000 | 1,775,000 | 975,000 | 1,675,000 | 1,950,000 | 6,848,000 | 6,375,000 | 4,600,000
Investment securities gains (losses) | 671,000 | 0 | 9,000 | 84,000 | 0 | 458,000 | 528,000 | (31,000) | 764,000 | 954,000 | 2,483,000
Noninterest income | 14,277,000 | 14,480,000 | 14,243,000 | 14,242,000 | 14,266,000 | 13,621,000 | 13,262,000 | 13,149,000 | 58,006,000 | 55,257,000 | 54,860,000
Noninterest expense | 24,879,000 | 24,665,000 | 23,959,000 | 29,403,000 | 21,273,000 | 21,846,000 | 24,763,000 | 19,515,000 | 102,906,000 | 87,401,000 | 81,141,000
Income before income tax expense | 20,282,000 | 21,192,000 | 19,746,000 | 12,930,000 | 16,925,000 | 16,318,000 | 11,391,000 | 15,383,000 |  |  |
Income tax expense | 6,877,000 | 7,056,000 | 6,573,000 | 4,769,000 | 5,848,000 | 5,526,000 | 3,780,000 | 5,144,000 | 25,275,000 | 20,298,000 | 20,571,000
Net Income Available to Common Shareholders | 13,247,000 | 13,975,000 | 13,006,000 | 7,987,000 | 10,894,000 | 10,607,000 | 7,413,000 | 10,031,000 | 48,215,000 | 38,945,000 | 40,678,000
Net earnings available to common shareholders | $ 13,127,000 | $ 13,848,000 | $ 12,890,000 | $ 7,922,000 | $ 10,809,000 | $ 10,523,000 | $ 7,354,000 | $ 9,955,000 |  |  |
Basic earnings per common share (in dollars per share) | $ 0.84 | $ 0.89 | $ 0.83 | $ 0.51 | $ 0.73 | $ 0.71 | $ 0.50 | $ 0.68 | $ 3.07 | $ 2.63 | $ 2.68
Diluted earnings per common share (in dollars per share) | $ 0.83 | $ 0.88 | $ 0.82 | $ 0.51 | $ 0.73 | $ 0.71 | $ 0.50 | $ 0.67 | $ 3.04 | $ 2.61 | $ 2.67
Basic | 15,636 | 15,608 | 15,582 | 15,473 | 14,755 | 14,751 | 14,680 | 14,679 | 15,564 | 14,714 | 15,055
Diluted | 15,799 | 15,790 | 15,752 | 15,627 | 14,837 | 14,834 | 14,759 | 14,759 | 15,708 | 14,796 | 15,130

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