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Investment in Securities (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
|  | March 31, 2013
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |  |
(In thousands) |  | Cost |  | Gains |  | Losses |  | Fair Value
State and political subdivisions |  | $ | 283,625 |  | $ | 17,343 |  | $ | 203 |  | $ | 300,765
Certificates of deposit |  |  | 6,742 |  |  | — |  |  | — |  |  | 6,742
Total |  | $ | 290,367 |  | $ | 17,343 |  | $ | 203 |  | $ | 307,507
|  | December 31, 2012
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |  |
(In thousands) |  | Cost |  | Gains |  | Losses |  | Fair Value
State and political subdivisions |  | $ | 315,345 |  | $ | 19,960 |  | $ | 112 |  | $ | 335,193
Certificates of deposit |  |  | 6,742 |  |  | — |  |  | — |  |  | 6,742
Total |  | $ | 322,087 |  | $ | 19,960 |  | $ | 112 |  | $ | 341,935
Schedule of Unrealized Loss on Investments [Table Text Block] | The fair values of securities with unrealized losses are as follows:
|  | March 31, 2013
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
(In thousands) |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
State and political |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
subdivisions |  | $ | 28,408 |  | $ | 203 |  | $ | — |  | $ | — |  | $ | 28,048 |  | $ | 203
Certificates of deposit |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Total |  | $ | 28,048 |  | $ | 203 |  | $ | — |  | $ | — |  | $ | 28,048 |  | $ | 203
|  | December 31, 2012
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
(In thousands) |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
State and political |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
subdivisions |  | $ | 19,758 |  | $ | 112 |  | $ | — |  | $ | — |  | $ | 19,758 |  | $ | 112
Certificates of deposit |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Total |  | $ | 19,758 |  | $ | 112 |  | $ | — |  | $ | — |  | $ | 19,758 |  | $ | 112
Schedule Of Amortized Cost And Fair Value [Table Text Block] | The amortized cost and fair value of investment securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.
|  | March 31, 2013
(In thousands) |  | Amortized Cost |  | Fair Value
Due in 1 year or less |  | $ | 16,816 |  | $ | 17,039
Due after 1 year through 5 years |  |  | 72,535 |  |  | 77,867
Due after 5 years through 10 years |  |  | 148,171 |  |  | 155,920
Due after 10 years |  |  | 52,845 |  |  | 56,681
Total |  | $ | 290,367 |  | $ | 307,507

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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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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + 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 + Details
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