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Note 10 - Borrowed Funds (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2005 | Dec. 31, 2004 | May 31, 2011
Federal Funds Purchased |  | $ 27,000 |  |  |  |
Securities Sold under Agreements to Repurchase | 1,250,000,000 | 1,400,000,000 |  |  |  |
Prepaid Security Sold Under Repurchase Agreement | 150,000,000 | 50,000,000 |  |  |  |
Rate of Prepaid Security Sold Under Repurchase Agreements | 4.43% | 4.83% |  |  |  |
Prepayment Penalty Security Sold Under Agreements To Repurchase | 9,400,000 |  |  |  |  | 1,700,000
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points) | 1.68% |  |  |  |  |
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase | 13 |  |  |  |  |
Total Fixed To Floating Rate Agreements | 650,000,000 |  |  |  |  |
Minimum Initial Fixed Rate | 1.00% |  |  |  |  |
Maximum Initial Fixed Rate | 3.50% |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.00% |  |  |  |  |
Advances from Federal Home Loan Banks | 146,200,000 | 225,000,000 |  |  |  |
Federal Home Loan Bank Prepaid Advances | 100,000,000 | 450,000,000 |  |  |  |
Weighted Average Rate for Prepaying Federal Home Loan Bank Advances | 4.60% | 4.39% |  |  |  |
Prepayment Fees on Advances, Net | 2,800,000 | 18,500,000 |  |  |  |
Other Borrowings |  | 880,000 |  |  |  |
Weighted Average Rate for Borrowing From Other Financial Institutions |  | 0.55% |  |  |  |
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 | 71,000 | 67,000 | 62,000 |  |  |
Accrued Bonuses | 1,100,000 | 995,000 |  |  |  |
Federal Funds Purchased [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.29% |  |  |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 3.84% | 4.14% | 4.18% |  |  |
Investment Securities Pledged As Collateral | 1,400,000,000 | 1,600,000,000 |  |  |  |
Terms Modified in Current Year [Member] |  |  |  |  |  |
Securities Sold under Agreements to Repurchase |  |  |  |  |  | 200,000,000
Floating to Fixed Rate Agreements Totaling $400 Million [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.52% |  |  |  |  |
Floating to Fixed Rate Agreements Totaling $400 Million [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.07% |  |  |  |  |
Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |  |  |  |
Number Of Floating-To-Fixed Rate Agreements | 7 |  |  |  |  |
Total Floating To Fixed Rate | 400,000,000 |  |  |  |  |
LIBOR Minus Three Hundred and Forty Basis Points | LIBOR minus 340 |  |  |  |  |
Federal Home Loan Bank Advances [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate | 0.44% | 2.08% |  |  |  |
Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |  |  |  |
LIBOR Minus Hundred Basis Point | LIBOR minus 200 |  |  |  |  |
Callable Securities [Member] |  |  |  |  |  |
Securities Sold under Agreements to Repurchase | $ 1,050,000,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate (in Basis Points) | 3.25% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate (in Basis Points) | 3.79% |  |  |  |  |

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