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Borrowings - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | $ 121,506,000 | $ 136,118,000
Convertible and callable advances | 150,000,000 | 161,558,000
Fixed rate credit |  | 6,270,000
FHLB borrowing amount paid | 11,470,000 |
Gain on repayment of FHLB borrowings | 296,000 |
Qualifying loans | 1,130,000,000 | 998,140,000
Unused borrowing capacity | 331,570,000 |
Junior subordinated debentures issued | 15,460,000 |
Libor rate | 2.95% |
Federal Home Loan Bank Borrowings |  |
Debt Instrument [Line Items] |  |
Gain on repayment of FHLB borrowings | 217,000 |
Federal Home Loan Bank Borrowings | Minimum |  |
Debt Instrument [Line Items] |  |
FHLB borrowings contractual maturities | 4 years |
Federal Home Loan Bank Borrowings | Maximum |  |
Debt Instrument [Line Items] |  |
FHLB borrowings contractual maturities | 8 years |
Retail Overnight And Term Repurchase Agreement |  |
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | 71,510,000 | 77,920,000
Wholesale Repurchase Agreement |  |
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | 50,000,000 | 58,200,000
Weighted average contractual rate of the wholesale repurchase agreements | 3.71% | 3.34%
Payment of purchase agreement | 8,150,000 |
Gain on payment of repurchase agreement | 79,000 |
Convertible And Callable Advances |  |
Debt Instrument [Line Items] |  |
Weighted average contractual rate of the wholesale repurchase agreements | 4.12% | 3.86%
Convertible and callable advances | $ 150,000,000 | $ 155,280,000

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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 17 -IssueDate 2006-05-01 -Chapter 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7523297&loc=d3e113969-111729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph f, h -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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