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Note 5 - Loans (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Mar. 31, 2012 | Jul. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Loans Sold [Member] | Dec. 31, 2012 Held For Sale [Member] | Dec. 31, 2011 New Loan [Member] | Dec. 31, 2012 Nonaccrual Loans [Member] | Dec. 31, 2011 Nonaccrual Loans [Member] | Dec. 31, 2010 Nonaccrual Loans [Member] | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Nonaccrual Loans Held For Sale [Member] | Dec. 31, 2012 Commercial Real Estate Other Receivable [Member] | Dec. 31, 2012 Land Loan Member | Dec. 31, 2012 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Residential Mortgage Loans [Member] | Dec. 31, 2011 Commercial Construction Loans [Member] | Dec. 31, 2012 Residential Mortgage Loans [Member] | Dec. 31, 2011 Residential Mortgage Loans [Member] | Dec. 31, 2012 Real Estate Loans [Member] | Dec. 31, 2011 Real Estate Loans [Member] | Dec. 31, 2012 Commercial Loans Member | Dec. 31, 2011 Commercial Loans Member | Dec. 31, 2012 Commercial Real Estate Loans [Member] | Dec. 31, 2012 Construction [Member] | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Non Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Non Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Retail Shopping And Commercial Use Building Member | Dec. 31, 2011 Retail Shopping And Commercial Use Building Member | Dec. 31, 2012 Office And Commercial Use Building Member | Dec. 31, 2011 Office And Commercial Use Building Member | Dec. 31, 2012 Hotel Loan Member | Dec. 31, 2011 Hotel Loan Member | Dec. 31, 2012 Single Family Residential Loan Member | Sep. 30, 2012 Single Family Residential Loan Member | Dec. 31, 2011 Single Family Residential Loan Member | Sep. 30, 2012 Land Loan Member | Dec. 31, 2011 Land Loan Member | Sep. 30, 2012 Commercial Loans Member | Dec. 31, 2011 Commercial Loans Member | Sep. 30, 2012 Multi-Family Residences [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Loans Receivable Held-for-sale, Amount |  |  | $ 0 | $ 760,000 | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  | $ 260,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Portfolio Loans and Leases to Held-for-sale |  |  | 15,986,000 | 4,399,000 | 4,332,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Loans Held-for-sale |  |  |  | 3,600,000 |  | 16,200,000 |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Loans and Leases |  |  |  | 88,000 |  |  | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Loans Held-for-sale to Portfolio Loans |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease In Loans Held For Sale |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer to Other Real Estate |  |  |  | 2,874,000 | 21,473,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000,000 | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Pledged with Federal Reserve Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 211,600,000 | 250,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount |  |  | 201,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,500,000 |  |  |  | 42,100,000 |  | 62,200,000 | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Cost of Mortgages Sold | 7,900,000 | 24,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Loan Participation to Contractual Balance | 92.50% | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 248,597,000 | 321,973,000 |  |  |  |  | 103,900,000 | 201,200,000 |  | 144,700,000 | 120,000,000 | 760,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment |  |  | 277,776,000 | 361,353,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method |  |  | 9,305,000 | 5,330,000 |  |  |  |  | 6,621,000 | 13,049,000 | 17,304,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Charge-Off To Contractual Balances For Impaired Loans |  |  | 23.20% | 25.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,700,000 | 120,000,000 | 47,700,000 | 50,900,000 | 68,100,000 |  | 40,400,000 |  | 12,400,000 |  |  | 19,100,000 |  | 2,300,000 |  | 1,300,000 |  |  |  |
Impaired Financing Receivable, Modifications, Related Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 1,400,000 | 7,800,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 61 | 32 |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 11 | 15 | 7 | 2 | 1 | 17 |  | 10 | 2 | 1 | 6 | 2 | 3 |  |
undefined |  |  | 24,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,958,000 | 60,863,000 | 12,304,000 | 13,269,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  | 144,695,000 | 120,016,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,716,000 | 3,368,000 |  |  | 3,964,000 | 15,120,000 |  |  |  |  |  |  |  |  |  | 23,800,000 |  | 7,900,000 |  |  | 13,300,000 |  | 635,000 |  | 39,000 | 1,100,000 |  |
Period Loan Is In Payment Default |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 | 90
Financing Receivable Modification Number Of Contracts Defaulted Within 12 Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 4 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Modifications Recorded Investment Defaulted Within 12 Months |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,300,000 | 12,200,000 |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  | $ 46,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,000 |  |  |  |  |  |  |  |  |  |  |  | $ (251,000) | $ (2,341,000) | $ (4,182,000) | $ (7,303,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 -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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition The increase (decrease) during the reporting period in the value of loans or securitized loans that are held with the intention to sell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6587932&loc=d3e60097-112785 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 3, 15, 16, 17, 22, 23, 147, 148, 149 -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 Statement of Financial Accounting Standard (FAS) -Number 102 -Paragraph 9 -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3461-108585 + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -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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- Definition The carrying amount of mortgage loans on real estate that were sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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