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Balance Sheet Offsetting - Financial Instruments Derivative Assets Liabilities and Resell Agreements Net of Amount Not Offset (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Financial assets | $ 14,360 | $ 2,246
Financial Instruments, Financial assets | (13,867) | (2,243)
Collateral, Financial assets |  |
Net Amount, Financial assets | 493 | 3
Net Amount Recognized, Resell agreements, Financial assets | 4,898 | 4,898
Financial Instruments, Resell agreements, Financial assets |  |
Collateral, Resell agreements, Financial assets | (4,898) | (4,898)
Net Amount, Resell agreements, Financial assets |  |
Net Amount Recognized, Financial assets | 19,258 | 7,144
Financial Instruments, Financial assets | (13,867) | (2,243)
Collateral, Financial assets | (4,898) | (4,898)
Net Amount, Financial assets | 493 | 3
Net Amount Recognized, Financial liabilities | 49,137 | 74,159
Financial Instruments, Financial liabilities | (13,867) | (2,243)
Collateral, Financial liabilities | (31,094) | (68,773)
Net Amount, Financial liabilities | 4,176 | 3,143
Net Amount Recognized, Repurchase agreements, Financial liabilities | 549,073 | 559,461
Financial Instruments, Repurchase agreements, Financial liabilities |  |
Collateral, Repurchase agreements, Financial liabilities | (549,073) | (559,461)
Net Amount, Repurchase agreements, Financial liabilities |  |
Net Amount Recognized, Financial liabilities | 598,210 | 633,620
Financial Instruments, Financial liabilities | (13,867) | (2,243)
Collateral, Financial liabilities | (580,167) | (628,234)
Net Amount, Financial liabilities | 4,176 | 3,143
Counterparty A [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Financial assets | 2,425 | 4
Financial Instruments, Financial assets | (2,425) | (4)
Collateral, Financial assets |  |
Net Amount, Financial assets |  |
Net Amount Recognized, Financial liabilities | 23,412 | 33,999
Financial Instruments, Financial liabilities | (2,425) | (4)
Collateral, Financial liabilities | (19,708) | (33,778)
Net Amount, Financial liabilities | 1,279 | 217
Counterparty B [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Financial assets | 6,045 | 2,033
Financial Instruments, Financial assets | (6,045) | (2,033)
Collateral, Financial assets |  |
Net Amount, Financial assets |  |
Net Amount Recognized, Financial liabilities | 7,458 | 14,374
Financial Instruments, Financial liabilities | (6,045) | (2,033)
Collateral, Financial liabilities |  | (11,318)
Net Amount, Financial liabilities | 1,413 | 1,023
Counterparty C [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Financial assets | 3,437 | 189
Financial Instruments, Financial assets | (3,437) | (189)
Collateral, Financial assets |  |
Net Amount, Financial assets |  |
Net Amount Recognized, Financial liabilities | 11,888 | 13,807
Financial Instruments, Financial liabilities | (3,437) | (189)
Collateral, Financial liabilities | (8,451) | (13,618)
Net Amount, Financial liabilities |  |
Other Counterparties [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Financial assets | 2,453 | 20
Financial Instruments, Financial assets | (1,960) | (17)
Collateral, Financial assets |  |
Net Amount, Financial assets | 493 | 3
Net Amount Recognized, Financial liabilities | 6,379 | 11,979
Financial Instruments, Financial liabilities | (1,960) | (17)
Collateral, Financial liabilities | (2,935) | (10,059)
Net Amount, Financial liabilities | $ 1,484 | $ 1,903

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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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