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Securities (Tables) | 3 Months Ended
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Mar. 31, 2013
Securities [Abstract] |
Summarizes securities held for investment and securities available for sale | The following table summarizes securities held for investment and securities available for sale:
|  | March 31, 2013 |
|  | (Dollars in thousands) |
Held for investment, at cost (fair value: $16,317) |  | $ | 16,099 |
Available for sale, at fair value |  |  | 549,391 |
Total |  | $ | 565,490 |
Summarizes amortized cost and estimated fair values of securities held for investment | The following table summarizes the amortized cost and estimated fair values of securities held for investment:
|  | March 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Mortgage backed securities (1) |  | $ | 740 |  |  | $ | 56 |  |  | $ | — |  |  | $ | 796 |
States and political subdivisions |  |  | 15,359 |  |  |  | 170 |  |  |  | (8 | ) |  |  | 15,521 |
Total |  | $ | 16,099 |  |  | $ | 226 |  |  | $ | (8 | ) |  | $ | 16,317 |
Summarizes amortized cost and estimated fair values of securities available for sale | The following table summarizes the amortized cost and estimated fair values of securities available for sale:
|  | March 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
U.S. treasury and other Federal agencies |  | $ | 459,301 |  |  | $ | 3,233 |  |  | $ | (155 | ) |  | $ | 462,379 |
Mortgage backed securities (1) |  |  | 17,212 |  |  |  | 764 |  |  |  | (2 | ) |  |  | 17,974 |
States and political subdivisions |  |  | 52,858 |  |  |  | 2,646 |  |  |  | (11 | ) |  |  | 55,493 |
Other securities (2) |  |  | 10,965 |  |  |  | 2,580 |  |  |  | — |  |  |  | 13,545 |
Total |  | $ | 540,336 |  |  | $ | 9,223 |  |  | $ | (168 | ) |  | $ | 549,391 |
(1) | Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
(2) | Primarily consists of equity securities.
Maturity of securities | The maturities of securities held for investment and available for sale are summarized in the following table using contractual maturities.
|  | March 31, 2013 |
|  | Amortized Cost |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Held for Investment |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 4,590 |  |  | $ | 4,627 |
After one year but within five years |  |  | 9,898 |  |  |  | 9,999 |
After five years but within ten years |  |  | 1,179 |  |  |  | 1,212 |
After ten years |  |  | 432 |  |  |  | 479 |
Total |  | $ | 16,099 |  |  | $ | 16,317 |
Available for Sale |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |
Within one year |  | $ | 191,802 |  |  | $ | 192,015 |
After one year but within five years |  |  | 219,323 |  |  |  | 221,790 |
After five years but within ten years |  |  | 34,426 |  |  |  | 35,851 |
After ten years |  |  | 87,206 |  |  |  | 89,611 |
Total debt securities |  |  | 532,757 |  |  |  | 539,267 |
Equity securities |  |  | 7,579 |  |  |  | 10,124 |
Total |  | $ | 540,336 |  |  | $ | 549,391 |
Company's book value of pledged securities | The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law:
|  | March 31, 2013 |
|  | (Dollars in thousands) |
Book value of pledged securities |  | $ | 487,367 |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 7: 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 8: 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 9: 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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