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Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Securities [Abstract] |
Amortized cost and fair value of securities with gross unrealized gains and losses |
|  | (In Thousands) |
|  | 2012 |
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 10,604 |  |  | $ | — |  |  | $ | (36 | ) |  | $ | 10,568 |
U.S. Government agency |  |  | 216,466 |  |  |  | 3,905 |  |  |  | (171 | ) |  |  | 220,200 |
Mortgage-backed securities |  |  | 51,581 |  |  |  | 1,425 |  |  |  | — |  |  |  | 53,006 |
State and local governments |  |  | 68,022 |  |  |  | 4,129 |  |  |  | (20 | ) |  |  | 72,131 |
Total available-for-sale securities |  | $ | 346,673 |  |  | $ | 9,459 |  |  | $ | (227 | ) |  | $ | 355,905 |
|  | (In Thousands) |
|  | 2011 |
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 26,050 |  |  | $ | 641 |  |  | $ | — |  |  | $ | 26,691 |
U.S. Government agency |  |  | 174,545 |  |  |  | 3,270 |  |  |  | (18 | ) |  |  | 177,797 |
Mortgage-backed securities |  |  | 54,113 |  |  |  | 1,318 |  |  |  | (18 | ) |  |  | 55,413 |
State and local governments |  |  | 63,143 |  |  |  | 4,476 |  |  |  | (1 | ) |  |  | 67,618 |
Total available-for-sale securities |  | $ | 317,851 |  |  | $ | 9,705 |  |  | $ | (37 | ) |  | $ | 327,519 |
Gross unrealized losses, aggregated by investment category and length of time |
|  | 2012 |
|  | (In Thousands) |  |  | (In Thousands) |
|  | Less Than Twelve Months |  |  | Twelve Months & Over |
|  | Gross |  |  |  |  |  | Gross |  |  |  |
|  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |
|  | Losses |  |  | Value |  |  | Losses |  |  | Value |
U.S. Treasury |  | $ | (36 | ) |  | $ | 10,568 |  |  | $ | — |  |  | $ | — |
U.S. Government agency |  |  | (171 | ) |  |  | 33,034 |  |  |  | — |  |  |  | — |
Mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
State and local governments |  |  | (20 | ) |  |  | 2,903 |  |  |  | — |  |  |  | — |
Total available-for-sales securities |  | $ | (227 | ) |  | $ | 46,505 |  |  | $ | — |  |  | $ | — |
|  | 2011 |
|  | (In Thousands) |  |  | (In Thousands) |
|  | Less Than Twelve Months |  |  | Twelve Months & Over |
|  | Gross |  |  |  |  |  | Gross |  |  |  |
|  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |
|  | Losses |  |  | Value |  |  | Losses |  |  | Value |
U.S. Treasury |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. Government agency |  |  | (18 | ) |  |  | 12,192 |  |  |  | — |  |  |  | — |
Mortgage-backed securities |  |  | (18 | ) |  |  | — |  |  |  | — |  |  |  | — |
State and local governments |  |  | (1 | ) |  |  | 652 |  |  |  | — |  |  |  | — |
Total available-for-sales securities |  | $ | (37 | ) |  | $ | 12,844 |  |  | $ | — |  |  | $ | — |
Gross realized gains and losses |
|  | (In Thousands) |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Gross realized gains |  | $ | 852 |  |  | $ | 504 |  |  | $ | 956 |
Gross realized losses |  |  | — |  |  |  | — |  |  |  | — |
Net realized gains |  | $ | 852 |  |  | $ | 504 |  |  | $ | 956 |
Tax expense related to net realized gains |  | $ | 290 |  |  | $ | 171 |  |  | $ | 325 |
Amortized cost and fair value of debt securities, by contractual maturity |
|  | (In Thousands) |
|  | Amortized |  |  |  |
|  | Cost |  |  | Fair Value |
One year or less |  | $ | 43,350 |  |  | $ | 43,633 |
After one year through five years |  |  | 152,321 |  |  |  | 156,763 |
After five years through ten years |  |  | 90,278 |  |  |  | 91,978 |
After ten years |  |  | 9,143 |  |  |  | 10,525 |
Total |  | $ | 295,092 |  |  | $ | 302,899 |
Mortgage-backed securities |  |  | 51,581 |  |  |  | 53,006 |
Total |  | $ | 346,673 |  |  | $ | 355,905 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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