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Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | $ 37,812 | $ 49,641
Total gains or losses included in earnings | 2,409 | (4,208)
Total gains or losses included in other comprehensive income | 5,490 | 1,166
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (15,981) | (7,027)
Settlements | (5,398) | (7,727)
Transfers from Level 3 | 0 | (11,965)
Transfers into Level 3 | 461 | 17,932
Balance, end of period | 24,793 | 37,812
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 22,980 | 26,352
Total gains or losses included in earnings | 0 | 0
Total gains or losses included in other comprehensive income | 5,490 | 1,284
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (5,097) | (4,656)
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 0
Balance, end of period | 23,373 | 22,980
Equities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 1,420 | 1,570
Total gains or losses included in earnings | 0 | (150)
Total gains or losses included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 0
Balance, end of period | 1,420 | 1,420
Loans Held for Sale [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 13,412 | 0
Total gains or losses included in earnings | 2,870 | 0
Total gains or losses included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (15,981) | 0
Settlements | (301) | 0
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 13,412
Balance, end of period | 0 | 13,412
Other Assets [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 0 | 0
Total gains or losses included in earnings | (461) | (4,449)
Total gains or losses included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | (71)
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 461 | 4,520
Balance, end of period | 0 | 0
Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period |  | 343
Total gains or losses included in earnings |  | 4
Total gains or losses included in other comprehensive income |  | (20)
Purchases |  | 0
Issuances |  | 0
Sales |  | (327)
Settlements |  | 0
Transfers from Level 3 |  | 0
Transfers into Level 3 |  | 0
Balance, end of period |  | 0
Corporate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period |  | 21,376
Total gains or losses included in earnings |  | 387
Total gains or losses included in other comprehensive income |  | (98)
Purchases |  | 0
Issuances |  | 0
Sales |  | (6,700)
Settlements |  | (3,000)
Transfers from Level 3 |  | (11,965)
Transfers into Level 3 |  | 0
Balance, end of period |  | $ 0

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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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. + Details
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