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Investment Securities, Available-for-Sale (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Total investment securities, weighted yield | 2.92% | 2.71%
Total investment securities, amortized cost | $ 3,562,001 | $ 3,587,677
Total investment securities, gross unrealized gains | 100,759 | 101,778
Total investment securities, gross unrealized losses | (4,723) | (6,450)
Total investment securities, fair value | 3,658,037 | 3,683,005
U.S. government and federal agency [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within one year, weighted yield | 1.62% | 1.62%
Maturing within one year, amortized cost | 200 | 201
Maturing within one year, gross unrealized gains | 0 | 1
Maturing within one year, fair value | 200 | 202
U.S. government sponsored enterprises [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing after one year through five years, weighted yield | 2.28% | 2.30%
Maturing after five years through ten years, weighted yield | 2.03% | 2.03%
Total investment securities, weighted yield | 2.28% | 2.29%
Maturing after one year through five years, amortized cost | 14,809 | 17,064
Maturing after five years through ten years, amortized cost | 43 | 44
Total investment securities, amortized cost | 14,852 | 17,108
Maturing after one year through five years, gross unrealized gains | 348 | 371
Maturing after five years through ten years, gross unrealized gains | 1 | 1
Total investment securities, gross unrealized gains | 349 | 372
Maturing after one year through five years, fair value | 15,157 | 17,435
Maturing after five years through ten years, fair value | 44 | 45
Total investment securities, fair value | 15,201 | 17,480
State and local governments [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within one year, weighted yield | 2.01% | 2.01%
Maturing after one year through five years, weighted yield | 2.08% | 2.11%
Maturing after five years through ten years, weighted yield | 3.04% | 2.95%
Maturing after ten years, weighted yield | 4.61% | 4.70%
Total investment securities, weighted yield | 4.23% | 4.29%
Maturing within one year, amortized cost | 4,278 | 4,288
Maturing after one year through five years, amortized cost | 151,885 | 149,497
Maturing after five years through ten years, amortized cost | 42,002 | 38,346
Maturing after ten years, amortized cost | 1,007,391 | 935,897
Total investment securities, amortized cost | 1,205,556 | 1,128,028
Maturing within one year, gross unrealized gains | 23 | 28
Maturing after one year through five years, gross unrealized gains | 4,502 | 4,142
Maturing after five years through ten years, gross unrealized gains | 1,478 | 1,102
Maturing after ten years, gross unrealized gains | 74,791 | 82,823
Total investment securities, gross unrealized gains | 80,794 | 88,095
Maturing within one year, gross unrealized losses | 0 | (2)
Maturing after one year through five years, gross unrealized losses | (115) | (142)
Maturing after five years through ten years, gross unrealized losses | (121) | (99)
Maturing after ten years, gross unrealized losses | (2,802) | (1,362)
Total investment securities, gross unrealized losses | (3,038) | (1,605)
Maturing within one year, fair value | 4,301 | 4,314
Maturing after one year through five years, fair value | 156,272 | 153,497
Maturing after five years through ten years, fair value | 43,359 | 39,349
Maturing after ten years, fair value | 1,079,380 | 1,017,358
Total investment securities, fair value | 1,283,312 | 1,214,518
Corporate bonds [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing within one year, weighted yield | 1.75% | 1.73%
Maturing after one year through five years, weighted yield | 2.11% | 2.22%
Maturing after five years through ten years, weighted yield | 2.28% | 2.23%
Total investment securities, weighted yield | 2.10% | 2.19%
Maturing within one year, amortized cost | 21,882 | 18,412
Maturing after one year through five years, amortized cost | 389,200 | 250,027
Maturing after five years through ten years, amortized cost | 18,069 | 16,144
Total investment securities, amortized cost | 429,151 | 284,583
Maturing within one year, gross unrealized gains | 114 | 51
Maturing after one year through five years, gross unrealized gains | 4,868 | 4,018
Maturing after five years through ten years, gross unrealized gains | 361 | 381
Total investment securities, gross unrealized gains | 5,343 | 4,450
Maturing within one year, gross unrealized losses | 0 | 0
Maturing after one year through five years, gross unrealized losses | (355) | (238)
Maturing after five years through ten years, gross unrealized losses | 0 |
Total investment securities, gross unrealized losses | (355) | (238)
Maturing within one year, fair value | 21,996 | 18,463
Maturing after one year through five years, fair value | 393,713 | 253,807
Maturing after five years through ten years, fair value | 18,430 | 16,525
Total investment securities, fair value | 434,139 | 288,795
Collateralized debt obligations [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Maturing after ten years, weighted yield | 8.03% | 8.03%
Maturing after ten years, amortized cost | 1,829 | 1,708
Maturing after ten years, gross unrealized losses | 0 | 0
Maturing after ten years, fair value | 1,829 | 1,708
Residential mortgage-backed securities [Member] |  |
Comparison of amortized cost and estimated fair value of investment securities, available-for-sale |  |
Total investment securities, weighted yield | 2.28% | 1.95%
Total investment securities, amortized cost | 1,910,413 | 2,156,049
Total investment securities, gross unrealized gains | 14,273 | 8,860
Total investment securities, gross unrealized losses | (1,330) | (4,607)
Total investment securities, fair value | $ 1,923,356 | $ 2,160,302

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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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized 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 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 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 -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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