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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Carrying Value [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Total Assets | $ 2,473,353 | $ 2,222,023
Carrying Value [Member] | Government Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 359,300 | 46,507
Carrying Value [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 887,598 | 888,000
Carrying Value [Member] | CMO's / REMIC's-residential [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 571,960 | 604,508
Carrying Value [Member] | Municipal bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 625,429 | 652,037
Carrying Value [Member] | Other Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 5,100 | 10,474
Carrying Value [Member] | Investment securities - AFS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 2,449,387 | 2,201,526
Carrying Value [Member] | Interest rate swaps [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Interest rate swaps | 23,966 | 20,497
Interest rate swaps | 23,966 | 20,497
Level 1 [Member] | Government Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 1 [Member] | CMO's / REMIC's-residential [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 1 [Member] | Municipal bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 1 [Member] | Other Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 1 [Member] | Interest rate swaps [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Interest rate swaps |  |
Interest rate swaps |  |
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Interest rate swaps | 23,966 | 20,497
Total Assets | 2,473,353 | 2,222,023
Interest rate swaps | 23,966 | 20,497
Level 2 [Member] | Government Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 359,300 | 46,507
Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 887,598 | 888,000
Level 2 [Member] | CMO's / REMIC's-residential [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 571,960 | 604,508
Level 2 [Member] | Municipal bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 625,429 | 652,037
Level 2 [Member] | Other Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 5,100 | 10,474
Level 2 [Member] | Investment securities - AFS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS | 2,449,387 | 2,201,526
Level 2 [Member] | Interest rate swaps [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Interest rate swaps | 23,966 | 20,497
Interest rate swaps | 23,966 | 20,497
Level 3 [Member] | Government Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 3 [Member] | CMO's / REMIC's-residential [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 3 [Member] | Municipal bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 3 [Member] | Other Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Investment securities - AFS |  |
Level 3 [Member] | Interest rate swaps [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Interest rate swaps |  |
Interest rate swaps |  |

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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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