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Note 4 - Debt and Equity Securities (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Private Issue Collateralized Mortgage Obligations, Number | 3 |
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) | $ 696,209,000 | $ 756,156,000
Texas Ratio, Minimum Review Threshold | 50.00% |
Number Of Instruments Carried Under Fair Value Option Below Investment Grade | 1 |
FHLMC [Member] | REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 13 |
FNMA [Member] | REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 16 |
GNMA [Member] | REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 7 |
Private Issue CMO [Member] | REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 |
Corporate Debt Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 5 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 |
Municipal [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 8 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 |
Trust Preferred Securities [Member] | Single Issuer [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 |
Trust Preferred Securities [Member] | Pooled Issuer [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 2 |
Trust Preferred Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Number Of Instruments Below Investment Grade | 4 |
Number Of Instruments Below Investment Grade Evalatued For Default | 3 |
To Prepay in the Third Quarter of 2014 [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Number Of Pooled Trust Securities Assumed To Prepay | 1 |
To Prepay in the Second Quarter of 2015 [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Number Of Pooled Trust Securities Assumed To Prepay | 3 |
SignificantAssumptionsAmountOfPrepaymentsPreferredSecurities (in Dollars) | 15,000,000 |
To Prepay In The Third Quarter Of 2015 [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
SignificantAssumptionsAmountOfPrepaymentsPreferredSecurities (in Dollars) | 31,800,000 |
Pooled Trust Preferred Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Number Of Instruments With OTTI Charges Recorded | 2 |
Collateralized Mortgage Obligations [Member] | Collateralized By Commercial Real Estate [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) | 12,400,000 |
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) | 12,500,000 | 13,900,000
GNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 |
FNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 15 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 |
FHLMC [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 2 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | $ 0 |
Collateralized By Commercial Real Estate [Member] |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |
Private Issue Collateralized Mortgage Obligations, Number |  | 3

X
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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