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Condensed Financial Information of Parent Company (Schedule of Statements of Cash Flows) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 23,497,000 | $ 23,303,000 | $ 23,009,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | 28,886,000 | 35,328,000 | 25,642,000
Cash flows from investing activities: |  |  |
Net increase in securities | 104,351,000 | 114,646,000 | 61,768,000
Net decrease (increase) in loans | (34,378,000) | 19,165,000 | (35,981,000)
Purchases of premises and equipment, net | 4,857,000 | 3,099,000 | 1,925,000
Cash flows from financing activities: |  |  |
Net increase (decrease) in accounts and drafts payable | 21,192,000 | (72,440,000) | 79,094,000
Cash dividends paid | 8,510,000 | 7,361,000 | 6,279,000
Purchase of common shares of treasury | 0 |  |
Other financing activities | (1,083,000) | (534,000) | (161,000)
Net cash (used in) provided by financing activities | 30,387,000 | (64,995,000) | 102,432,000
Net (decrease) increase in cash and cash equivalents | 84,174,000 | (94,874,000) | 97,033,000
Cash and cash equivalents at beginning of year | 141,088,000 | 235,962,000 | 138,929,000
Cash and cash equivalents at end of year | 225,262,000 | 141,088,000 | 235,962,000
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 23,497,000 | 23,303,000 | 23,009,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Equity in undistributed income of subsidiary | 7,530,000 | 7,523,000 | 7,746,000
Net change in other assets | 8,420,000 | 3,338,000 | 19,669,000
Net change in other liabilities | (2,729,000) | 5,603,000 | 1,655,000
Amortization of stock-based awards | 1,177,000 | 1,201,000 | 1,390,000
Other, net | (4,180,000) | (2,673,000) | (7,497,000)
Net cash provided by operating activities | 1,815,000 | 16,573,000 | (8,858,000)
Cash flows from investing activities: |  |  |
Net increase in securities | 15,385,000 | 7,697,000 | 37,329,000
Net decrease (increase) in loans | (31,619,000) | (16,319,000) | (19,068,000)
Purchases of premises and equipment, net | 4,050,000 | 3,555,000 | 2,107,000
Net cash provided by (used in) investing activities | 12,184,000 | 5,067,000 | (20,368,000)
Cash flows from financing activities: |  |  |
Net increase (decrease) in accounts and drafts payable | 21,192,000 | (72,440,000) | 79,094,000
Cash dividends paid | 8,510,000 | 7,361,000 | 6,279,000
Other financing activities | 513,000 | (2,454,000) | (1,177,000)
Net cash (used in) provided by financing activities | 12,169,000 | (82,255,000) | 71,638,000
Net (decrease) increase in cash and cash equivalents | 26,168,000 | (60,615,000) | 42,412,000
Cash and cash equivalents at beginning of year | 61,414,000 | 122,029,000 | 79,617,000
Cash and cash equivalents at end of year | $ 87,582,000 | $ 61,414,000 | $ 122,029,000

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