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Note 6 - Loans and Allowance for Credit Losses (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  | 9 Months Ended | 3 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Performing Under Restructured Terms [Member] | Dec. 31, 2013 Performing Under Restructured Terms [Member] | Sep. 30, 2013 Performing Under Restructured Terms [Member] | Jun. 30, 2014 Owner Occupied [Member] Sold [Member] Nonperforming Financing Receivable [Member] | Jun. 30, 2014 Commercial Loan [Member] Sold [Member] Nonperforming Financing Receivable [Member] | Sep. 30, 2014 Commercial Real Estate Owner Occupied [Member] | Dec. 31, 2013 Commercial Real Estate Owner Occupied [Member] | Sep. 30, 2013 Commercial Real Estate Owner Occupied [Member] | Sep. 30, 2014 Commercial Real Estate and Real Estate Construction Loans [Member] | Sep. 30, 2014 Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member] | Sep. 30, 2014 Commercial Loan [Member] | Dec. 31, 2013 Commercial Loan [Member] | Sep. 30, 2013 Commercial Loan [Member] | Sep. 30, 2014 SBA Loans [Member] | Sep. 30, 2014 Home Equity Line of Credit [Member] | Dec. 31, 2013 Home Equity Line of Credit [Member] | Sep. 30, 2013 Home Equity Line of Credit [Member] | Sep. 30, 2014 Residential Mortgage Loan Long-Term [Member] | Mar. 31, 2014 Commercial Land Acquisition Loans [Member] | Sep. 30, 2014 ADC Loans [Member] | Sep. 30, 2014 Nonaccrual Loans [Member] | Sep. 30, 2014 Nonaccrual Loans Current and in Accordance with Original Terms [Member] | Sep. 30, 2014 Migrated From Nonperforming Loans [Member] Nonperforming Financing Receivable [Member] | Jun. 30, 2014 Sold [Member] Nonperforming Financing Receivable [Member] | Sep. 30, 2014 Reclassified to OREO [Member] Nonperforming Financing Receivable [Member] | Sep. 30, 2014 Paid Off [Member] | Sep. 30, 2014 Construction Loans [Member] | Dec. 31, 2013 Construction Loans [Member] | Sep. 30, 2013 Construction Loans [Member] | Sep. 30, 2014 Nonperforming Financing Receivable [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Minimum [Member]
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income | $ 15,200,000 | $ 10,900,000 | $ 15,200,000 | $ 10,900,000 | $ 12,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount | 67,100,000 |  | 67,100,000 |  | 67,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Loan Portfolio |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  | 70.00% | 59.00% | 23.00% |  |  | 1.00% | 3.00% |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan To Value Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |
Minimum Debt Service Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.15 |
Interest Rate Adjustment Frequency |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length Of Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  | 5 years | 24 months |  |  |  |  |  |  |  | 36 months |  |  |  | 7 years | 5 years
Stress Test Assumption Increase Interest Rates | 2.00% |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |
Financing Receivable, Net | 3,432,548,000 |  | 3,432,548,000 |  | 2,945,158,000 |  |  |  |  |  | 337,422,000 | 317,491,000 |  |  |  | 798,489,000 | 694,350,000 |  |  | 107,291,000 | 110,242,000 |  |  |  | 676,600,000 |  |  |  |  |  |  | 676,582,000 | 608,826,000 |  |  |  |
Loan Percent | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37.00% |  |  |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 37,220,000 | 37,524,000 | 37,220,000 | 37,524,000 | 32,646,000 |  |  |  |  |  | 3,502,000 | 5,452,000 | 6,426,000 |  |  | 15,431,000 | 6,779,000 | 9,607,000 |  | 588,000 | 623,000 | 511,000 |  |  |  |  |  |  |  |  |  | 11,440,000 | 12,933,000 | 13,576,000 | 1,500,000 |  |
Impaired Financing Receivable, Unpaid Principal Balance | 39,186,000 | 37,824,000 | 39,186,000 | 37,824,000 | 32,946,000 |  |  |  |  |  | 3,502,000 | 5,452,000 | 6,426,000 |  |  | 16,531,000 | 6,779,000 | 9,607,000 |  | 588,000 | 623,000 | 511,000 |  |  |  |  |  |  |  |  |  | 11,931,000 | 13,233,000 | 13,876,000 | 11,100,000 |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  |  | 7,900,000 | 7,900,000 | 10,000,000 | 4,100,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,300,000 | 6,100,000 |  | 217,000 |  |  |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 959,000 |  |  |  |  |  |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 1 | 0 | 1 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 2 | 1 |  |  |  |  |  |  |
Real Estate Owned, Transfer to Real Estate Owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  | 95,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | $ 2,100,000 | $ 6,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This item represents the frequency of interest rate adjustments. + References No definition available. + Details
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- Definition This item represents the length of time that the loan is in place. + References No definition available. + Details
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- Definition Percent of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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- Definition This item represents the percentage of the total loan portfolio represented by a segment of loans. + References No definition available. + Details
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- Definition This item represents the estimated increase in interest rates for performing the Company's stress tests. + References No definition available. + Details
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- Definition Number of 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 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + 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=25495931&loc=d3e18845-111554 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + 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=25495931&loc=d3e18845-111554 + 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=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting 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)(3) -URI http://asc.fasb.org/extlink&oid=35738203&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=35738203&loc=SL6953550-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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