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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | $ 2,184,386 | $ 2,130,029
Gross Unrealized Holding Gain | 76,606 | 72,703
Gross Unrealized Holding Loss | (1,461) | (1,206)
Available-for-sale Securities, Total | 2,259,531 | 2,201,526
Total Percent | 100.00% | 100.00%
Government agency & government-sponsored enterprises [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 32,172 | 46,273
Gross Unrealized Holding Gain | 190 | 234
Available-for-sale Securities, Total | 32,362 | 46,507
Total Percent | 1.43% | 2.11%
Residential Mortgage-backed securities[Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 839,345 | 869,847
Gross Unrealized Holding Gain | 23,977 | 18,487
Gross Unrealized Holding Loss |  | (334)
Available-for-sale Securities, Total | 863,322 | 888,000
Total Percent | 38.21% | 40.33%
CMO's / REMIC's - Residential [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 709,884 | 594,866
Gross Unrealized Holding Gain | 9,679 | 10,307
Gross Unrealized Holding Loss | (1,043) | (665)
Available-for-sale Securities, Total | 718,520 | 604,508
Total Percent | 31.80% | 27.46%
Municipal Bonds [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 592,528 | 608,575
Gross Unrealized Holding Gain | 42,741 | 43,665
Gross Unrealized Holding Loss | (418) | (203)
Available-for-sale Securities, Total | 634,851 | 652,037
Total Percent | 28.10% | 29.62%
Other Securities [Member] |  |
Amortized Cost and Estimated fair value of investment securities |  |
Amortized cost | 10,457 | 10,468
Gross Unrealized Holding Gain | 19 | 10
Gross Unrealized Holding Loss |  | (4)
Available-for-sale Securities, Total | $ 10,476 | $ 10,474
Total Percent | 0.46% | 0.48%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 115 -Paragraph 12 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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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