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Note 10 - Borrowed Funds (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2005 | Dec. 31, 2004 | May 31, 2011 | Dec. 31, 2011 Federal Funds Purchased [Member] | Dec. 31, 2013 Securities Sold under Agreements to Repurchase [Member] | Dec. 31, 2012 Securities Sold under Agreements to Repurchase [Member] | Dec. 31, 2011 Securities Sold under Agreements to Repurchase [Member] | Dec. 31, 2012 Terms Modified in Current Year [Member] | Dec. 31, 2012 Floating to Fixed Rate Agreements Totaling $400 Million [Member] | Dec. 31, 2013 Floating to Fixed Rate Agreements Totaling $400 Million [Member] Minimum [Member] | Dec. 31, 2013 Floating to Fixed Rate Agreements Totaling $400 Million [Member] Maximum [Member] | Dec. 31, 2013 Federal Home Loan Bank Advances [Member] | Dec. 31, 2012 Federal Home Loan Bank Advances [Member] | Dec. 31, 2012 Floating to Fixed Rate Agreements Totaling $400 Million [Member] | Dec. 31, 2013 Callable Securities [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Funds Purchased | $ 0 | $ 0 | $ 27,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 1.29% |  |  |  |  |  | 4.78% | 5.07% |  |  |  |  | 8.00% | 8.00% |
Securities Sold under Agreements to Repurchase | 800,000,000 | 1,250,000,000 |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  | 600,000,000 |  |  |
|  |  |  |  |  |  |  | 3.87% | 3.84% | 4.14% |  |  |  |  |  |  |  |  |  |  |
Prepaid Security Sold Under Repurchase Agreement | 450,000,000 | 150,000,000 |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of Prepaid Security Sold Under Repurchase Agreements | 3.79% | 4.43% |  |  |  | 4.83% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment Penalty Security Sold Under Agreements To Repurchase | 22,600,000 | 9,400,000 |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points) |  | 1.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Floating-To-Fixed Rate Agreements |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Total Floating To Fixed Rate |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |
Floating Interest Rate, Range of Time Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months | 1 year
LIBOR Minus Hundred Basis Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR rate minus 200 |  |  |  |
LIBOR Minus Three Hundred and Forty Basis Points |  |  |  |  |  |  |  |  |  |  |  | LIBOR rate minus 340 |  |  |  |  |  |  |  |  |
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Fixed To Floating Rate Agreements | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Initial Fixed Rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Initial Fixed Rate | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Interest Rate, Range of Time Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  | 12 months
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  | 3.75%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Pledged As Collateral |  |  |  |  |  |  |  | 906,100,000 | 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Bank | 521,200,000 | 146,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.17% | 0.44% |  |  |  |  |
Federal Home Loan Bank Prepaid Advances |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Rate for Prepaying Federal Home Loan Bank Advances |  | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment Fees on Advances, Net |  | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold for Deferred Bonus |  |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AmountOfDeferredBonusAccruedInOtherLiabilities |  |  |  |  | 610,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Interest On Deferred Bonus |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Basis Spread (in Basis Points) |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Other | 77,000 | 71,000 | 67,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Bonuses | $ 1,100,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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