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Condensed Financial Statements of Parent Company, Condensed Statements of Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income |  |  |
Interest on securities - taxable | $ 6,613 | $ 6,745 | $ 5,588
Interest on securities - nontaxable | 6,463 | 6,532 | 6,504
Other income | 472 | 449 | 354
Expenses |  |  |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 22,992 | 22,885 | 19,792
Applicable income tax benefit | (5,245) | (5,247) | (4,223)
Net income | 17,747 | 17,638 | 15,569
NBI [Member] |  |  |
Income |  |  |
Dividends from Subsidiaries | 7,639 | 7,258 | 6,309
Interest on securities - taxable | 5 | 17 | 23
Interest on securities - nontaxable | 33 | 42 | 44
Other income | 1,213 | 1,210 | 1,157
Total income | 8,890 | 8,527 | 7,533
Expenses |  |  |
Other expenses | 1,791 | 1,794 | 1,756
Income before income tax benefit and equity in undistributed net income of subsidiaries | 7,099 | 6,733 | 5,777
Applicable income tax benefit | 136 | 148 | 152
Income before equity in undistributed net income of subsidiaries | 7,235 | 6,881 | 5,929
Equity in undistributed net income of subsidiaries | 10,512 | 10,757 | 9,640
Net income | $ 17,747 | $ 17,638 | $ 15,569

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