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Condensed Financial Statements of Parent Company, Condensed Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash Flows from Operating Expenses |  |  |
Net income | $ 17,747 | $ 17,638 | $ 15,569
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of premiums and accretion of discounts, net | (224) | (217) | (300)
Depreciation expense | 764 | 799 | 886
Net change in other assets | (44) | 501 | (858)
Net change in other liabilities | (175) | (4,135) | (280)
Net cash provided by operating activities | 22,712 | 19,456 | 18,565
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (171,601) | (64,567) | (93,862)
Maturities and calls of securities available for sale | 151,051 | 74,961 | 68,565
Net cash used in investing activities | (39,739) | (45,321) | (47,763)
Cash Flows from Financing Activities |  |  |
Exercise of stock options | 119 | 92 | 0
Net cash provided by financing activities | 19,913 | 27,904 | 26,162
Net change in cash and due from banks | 2,886 | 2,039 | (3,036)
Cash and due from banks at beginning of year | 11,897 | 9,858 | 12,894
Cash and due from banks at end of year | 14,783 | 11,897 | 9,858
NBI [Member] |  |  |
Cash Flows from Operating Expenses |  |  |
Net income | 17,747 | 17,638 | 15,569
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed net income of subsidiaries | (10,512) | (10,757) | (9,640)
Amortization of premiums and accretion of discounts, net | 1 | 1 | 2
Depreciation expense | 12 | 9 | 9
Net change in refundable income taxes due from subsidiaries | 77 | 0 | 56
Net change in other assets | (199) | 147 | (24)
Net change in other liabilities | (124) | (364) | 244
Net cash provided by operating activities | 7,002 | 6,674 | 6,216
Cash Flows from Investing Activities |  |  |
Purchases of securities available for sale | (815) | (1,973) | (1,868)
Maturities and calls of securities available for sale | 1,352 | 2,250 | 1,950
Net cash used in investing activities | 537 | 277 | 82
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (7,639) | (6,938) | (6,309)
Exercise of stock options | 119 | 92 | 0
Capital distribution to subsidiary | 0 | (105) | 0
Net cash provided by financing activities | (7,520) | (6,951) | (6,309)
Net change in cash and due from banks | 19 | 0 | (11)
Cash and due from banks at beginning of year | 2 | 2 | 13
Cash and due from banks at end of year | $ 21 | $ 2 | $ 2

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