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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Held-to-maturity securities |  |
Amortized Cost | $ 2,400 | $ 2,400
Estimated Fair Value | 2,400 | 2,400
Carrying Value | 2,400 | 2,400
Available-for-sale securities |  |
Amortized Cost | 4,803,160 | 5,372,594
Gross Unrealized Gains | 66,663 | 65,104
Gross Unrealized Losses | (66,533) | (133,119)
Total investment securities | 4,803,290 | 5,304,579
Estimate of Fair Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 4,803,290 | 5,304,579
Reported Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 4,803,290 | 5,304,579
Other Debt Obligations [Member] |  |
Held-to-maturity securities |  |
Amortized Cost | 2,400 | 2,400
Estimated Fair Value | 2,400 | 2,400
Carrying Value | 2,400 | 2,400
Collateralized Mortgage Backed Securities [Member] |  |
Available-for-sale securities |  |
Amortized Cost | 4,513,064 | 5,096,165
Gross Unrealized Gains | 46,900 | 56,110
Gross Unrealized Losses | (60,700) | (124,574)
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 4,499,264 | 5,027,701
Collateralized Mortgage Backed Securities [Member] | Reported Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 4,499,264 | 5,027,701
US Government Corporations and Agencies Securities [Member] |  |
Available-for-sale securities |  |
Total investment securities | 1,551,363 | 1,799,807
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities |  |
Total investment securities | 2,922,948 | 3,200,042
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Available-for-sale securities |  |
Total investment securities | 24,953 | 27,852
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities |  |
Amortized Cost | 262,021 | 248,354
Gross Unrealized Gains | 18,662 | 8,063
Gross Unrealized Losses | (5,563) | (8,007)
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 275,120 | 248,410
US States and Political Subdivisions Debt Securities [Member] | Reported Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 275,120 | 248,410
Equity Securities [Member] |  |
Available-for-sale securities |  |
Amortized Cost | 28,075 | 28,075
Gross Unrealized Gains | 1,101 | 931
Gross Unrealized Losses | (270) | (538)
Equity Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | 28,906 | 28,468
Equity Securities [Member] | Reported Value Measurement [Member] |  |
Available-for-sale securities |  |
Total investment securities | $ 28,906 | $ 28,468

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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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 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 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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