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Investment Securities, Available-for-Sale (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Comparison of amortized cost and estimated fair value of investment securities designated as available-for-sale |
| September 30, 2013
| Weighted |  | Amortized |  | Gross Unrealized |  | Fair
(Dollars in thousands) | Yield |  | Cost |  | Gains |  | Losses |  | Value
U.S. government sponsored enterprises |  |  |  |  |  |  |  |  |
Maturing after one year through five years | 2.29 | % |  | $ | 11,278 |  |  | 240 |  |  | — |  |  | 11,518 |
Maturing after five years through ten years | 1.82 | % |  | 38 |  |  | — |  |  | — |  |  | 38 |
| 2.29 | % |  | 11,316 |  |  | 240 |  |  | — |  |  | 11,556 |
State and local governments |  |  |  |  |  |  |  |  |
Maturing within one year | 2.18 | % |  | 6,059 |  |  | 52 |  |  | — |  |  | 6,111 |
Maturing after one year through five years | 2.10 | % |  | 162,569 |  |  | 3,096 |  |  | (431 | ) |  | 165,234 |
Maturing after five years through ten years | 3.17 | % |  | 57,892 |  |  | 1,122 |  |  | (832 | ) |  | 58,182 |
Maturing after ten years | 4.46 | % |  | 1,104,890 |  |  | 28,571 |  |  | (21,604 | ) |  | 1,111,857 |
| 4.10 | % |  | 1,331,410 |  |  | 32,841 |  |  | (22,867 | ) |  | 1,341,384 |
Corporate bonds |  |  |  |  |  |  |  |  |
Maturing within one year | 2.10 | % |  | 73,064 |  |  | 736 |  |  | — |  |  | 73,800 |
Maturing after one year through five years | 2.10 | % |  | 358,034 |  |  | 2,890 |  |  | (2,852 | ) |  | 358,072 |
Maturing after five years through ten years | 2.22 | % |  | 11,058 |  |  | — |  |  | (85 | ) |  | 10,973 |
| 2.10 | % |  | 442,156 |  |  | 3,626 |  |  | (2,937 | ) |  | 442,845 |
Residential mortgage-backed securities | 2.44 | % |  | 1,515,728 |  |  | 15,357 |  |  | (7,917 | ) |  | 1,523,168 |
Total investment securities | 3.06 | % |  | $ | 3,300,610 |  |  | 52,064 |  |  | (33,721 | ) |  | 3,318,953 |
| December 31, 2012
| Weighted |  | Amortized |  | Gross Unrealized |  | Fair
(Dollars in thousands) | Yield |  | Cost |  | Gains |  | Losses |  | Value
U.S. government and federal agency |  |  |  |  |  |  |  |  |
Maturing within one year | 1.62 | % |  | $ | 201 |  |  | 1 |  |  | — |  |  | 202 |
U.S. government sponsored enterprises |  |  |  |  |  |  |  |  |
Maturing after one year through five years | 2.30 | % |  | 17,064 |  |  | 371 |  |  | — |  |  | 17,435 |
Maturing after five years through ten years | 2.03 | % |  | 44 |  |  | 1 |  |  | — |  |  | 45 |
| 2.29 | % |  | 17,108 |  |  | 372 |  |  | — |  |  | 17,480 |
State and local governments |  |  |  |  |  |  |  |  |
Maturing within one year | 2.01 | % |  | 4,288 |  |  | 28 |  |  | (2 | ) |  | 4,314 |
Maturing after one year through five years | 2.11 | % |  | 149,497 |  |  | 4,142 |  |  | (142 | ) |  | 153,497 |
Maturing after five years through ten years | 2.95 | % |  | 38,346 |  |  | 1,102 |  |  | (99 | ) |  | 39,349 |
Maturing after ten years | 4.70 | % |  | 935,897 |  |  | 82,823 |  |  | (1,362 | ) |  | 1,017,358 |
| 4.29 | % |  | 1,128,028 |  |  | 88,095 |  |  | (1,605 | ) |  | 1,214,518 |
Corporate bonds |  |  |  |  |  |  |  |  |
Maturing within one year | 1.73 | % |  | 18,412 |  |  | 51 |  |  | — |  |  | 18,463 |
Maturing after one year through five years | 2.22 | % |  | 250,027 |  |  | 4,018 |  |  | (238 | ) |  | 253,807 |
Maturing after five years through ten years | 2.23 | % |  | 16,144 |  |  | 381 |  |  | — |  |  | 16,525 |
| 2.19 | % |  | 284,583 |  |  | 4,450 |  |  | (238 | ) |  | 288,795 |
Collateralized debt obligations |  |  |  |  |  |  |  |  |
Maturing after ten years | 8.03 | % |  | 1,708 |  |  | — |  |  | — |  |  | 1,708 |
Residential mortgage-backed securities | 1.95 | % |  | 2,156,049 |  |  | 8,860 |  |  | (4,607 | ) |  | 2,160,302 |
Total investment securities | 2.71 | % |  | $ | 3,587,677 |  |  | 101,778 |  |  | (6,450 | ) |  | 3,683,005 |
Gain or loss on sale of Investments |
| Three Months ended |  | Nine Months ended
(Dollars in thousands) | September 30, 2013 |  | September 30, 2012 |  | September 30, 2013 |  | September 30, 2012
Gross proceeds | $ | 102,483 |  |  | — |  |  | 181,971 |  |  | — |
Less amortized cost | (102,886 | ) |  | — |  |  | (182,270 | ) |  | — |
Net loss on sale of investments | $ | (403 | ) |  | — |  |  | (299 | ) |  | — |
Gross gain on sale of investments | $ | 3,467 |  |  | — |  |  | 3,723 |  |  | — |
Gross loss on sale of investments | (3,870 | ) |  | — |  |  | (4,022 | ) |  | — |
Net loss on sale of investments | $ | (403 | ) |  | — |  |  | (299 | ) |  | — |
Summary of investments with an unrealized loss position |
| September 30, 2013
| Less than 12 Months |  | 12 Months or More |  | Total
(Dollars in thousands) | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
State and local governments | $ | 405,834 |  |  | (21,121 | ) |  | 22,373 |  |  | (1,746 | ) |  | 428,207 |  |  | (22,867 | )
Corporate bonds | 189,130 |  |  | (2,937 | ) |  | — |  |  | — |  |  | 189,130 |  |  | (2,937 | )
Residential mortgage-backed securities | 446,642 |  |  | (7,917 | ) |  | — |  |  | — |  |  | 446,642 |  |  | (7,917 | )
Total temporarily impaired securities | $ | 1,041,606 |  |  | (31,975 | ) |  | 22,373 |  |  | (1,746 | ) |  | 1,063,979 |  |  | (33,721 | )
| December 31, 2012
| Less than 12 Months |  | 12 Months or More |  | Total
(Dollars in thousands) | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
State and local governments | $ | 102,896 |  |  | (1,531 | ) |  | 4,533 |  |  | (74 | ) |  | 107,429 |  |  | (1,605 | )
Corporate bonds | 41,856 |  |  | (238 | ) |  | — |  |  | — |  |  | 41,856 |  |  | (238 | )
Residential mortgage-backed securities | 955,235 |  |  | (4,041 | ) |  | 62,905 |  |  | (566 | ) |  | 1,018,140 |  |  | (4,607 | )
Total temporarily impaired securities | $ | 1,099,987 |  |  | (5,810 | ) |  | 67,438 |  |  | (640 | ) |  | 1,167,425 |  |  | (6,450 | )

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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=27724398&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 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: 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=27724398&loc=d3e27337-111563 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: 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 7: 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=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.M) -URI http://asc.fasb.org/extlink&oid=27011274&loc=d3e87990-122713 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section M + 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=27724398&loc=d3e27290-111563 + Details
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