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Condensed Financial Information of Parent Company (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,341 | $ 6,092 | $ 5,962 | $ 5,908 | $ 5,491 | $ 6,060 | $ 5,739 | $ 5,719 | $ 23,303 | $ 23,009 | $ 20,310
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase in securities |  |  |  |  |  |  |  |  | 114,646 | 61,768 | 49,944
Net decrease (increase) in loans |  |  |  |  |  |  |  |  | 19,165 | (35,981) | 67,169
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | 3,099 | 1,925 | 1,190
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (65,207) | (31,041) | (124,505)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net (decrease) increase in accounts and drafts payable |  |  |  |  |  |  |  |  | (72,440) | 79,094 | 85,856
Cash dividends paid |  |  |  |  |  |  |  |  | 7,361 | 6,279 | 5,448
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | 0 | 0 | (467)
Other financing activities |  |  |  |  |  |  |  |  | (534) | (161) | (291)
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (94,874) | 97,033 | 59,635
Cash and cash equivalents at beginning of year |  |  |  | 235,962 |  |  |  | 138,929 | 235,962 | 138,929 | 79,294
Cash and cash equivalents at end of year | 141,088 |  |  |  | 235,962 |  |  |  | 141,088 | 235,962 | 138,929
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 23,303 | 23,009 | 20,310
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  | 7,523 | 7,746 | 7,090
Net change in other assets |  |  |  |  |  |  |  |  | (3,338) | (19,669) | (4,463)
Net change in other liabilities |  |  |  |  |  |  |  |  | 5,603 | 1,655 | (4,930)
Amortization of stock-based awards |  |  |  |  |  |  |  |  | 1,201 | 1,390 | 1,472
Other, net |  |  |  |  |  |  |  |  | (2,673) | (7,497) | 0
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 16,573 | (8,858) | 5,299
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase in securities |  |  |  |  |  |  |  |  | (7,697) | (37,329) | (45,173)
Net decrease (increase) in loans |  |  |  |  |  |  |  |  | 16,319 | 19,068 | (19,911)
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | (3,555) | (2,107) | (1,166)
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 5,067 | (20,368) | (66,250)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net (decrease) increase in accounts and drafts payable |  |  |  |  |  |  |  |  | 72,440 | (79,094) | (85,856)
Cash dividends paid |  |  |  |  |  |  |  |  | (7,361) | (6,279) | (5,448)
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | 0 | 0 | (467)
Other financing activities |  |  |  |  |  |  |  |  | (2,454) | (1,177) | (275)
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (82,255) | 71,638 | 79,666
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (60,615) | 42,412 | 18,715
Cash and cash equivalents at beginning of year |  |  |  | 122,029 |  |  |  | 79,617 | 122,029 | 79,617 | 60,902
Cash and cash equivalents at end of year | $ 61,414 |  |  |  | $ 122,029 |  |  |  | $ 61,414 | $ 122,029 | $ 79,617

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 + Details
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- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 61 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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