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Fair Value of Assets and Liabilities (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | $ 3,658,037 | $ 3,683,005
Interest rate swap [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total liabilities measured at fair value on a recurring basis | 14,080 | 16,832
U.S. government and federal agency [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 200 | 202
U.S. government sponsored enterprises [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 15,201 | 17,480
State and local governments [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,283,312 | 1,214,518
Corporate bonds [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 434,139 | 288,795
Collateralized debt obligations [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,829 | 1,708
Residential mortgage-backed securities [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,923,356 | 2,160,302
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate swap [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government and federal agency [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government sponsored enterprises [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and local governments [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate bonds [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized debt obligations [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential mortgage-backed securities [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 3,658,037 | 3,683,005
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swap [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total liabilities measured at fair value on a recurring basis | 14,080 | 16,832
Significant Other Observable Inputs (Level 2) [Member] | U.S. government and federal agency [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 200 | 202
Significant Other Observable Inputs (Level 2) [Member] | U.S. government sponsored enterprises [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 15,201 | 17,480
Significant Other Observable Inputs (Level 2) [Member] | State and local governments [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,283,312 | 1,214,518
Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 434,139 | 288,795
Significant Other Observable Inputs (Level 2) [Member] | Collateralized debt obligations [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,829 | 1,708
Significant Other Observable Inputs (Level 2) [Member] | Residential mortgage-backed securities [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 1,923,356 | 2,160,302
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Interest rate swap [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. government and federal agency [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. government sponsored enterprises [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | State and local governments [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate bonds [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Collateralized debt obligations [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Residential mortgage-backed securities [Member] |  |
Fair value measurement of assets and liabilities measured at fair value |  |
Total assets measured at fair value on a recurring basis | $ 0 | $ 0

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- Definition Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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