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Note 16 - Fair Value Measurements (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Securities available-for-sale |  |
Securities Available-for-Sale | $ 1,291,480 | $ 1,294,478
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 509,971 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 |
US Treasury Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 509,971 |
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 509,971 |
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 416,694 | 337,631
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 416,694 | 337,631
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 416,694 | 337,631
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,168 | 16,486
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,168 | 16,486
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,168 | 16,486
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 141 | 166
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Asset-backed Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 141 | 166
Asset-backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 141 | 166
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 335,977 | 380,429
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Corporate Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 335,977 | 380,429
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 335,977 | 380,429
Mutual Funds Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,079 | 6,035
Mutual Funds Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Mutual Funds Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Mutual Funds Member | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,079 | 6,035
Mutual Funds Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,079 | 6,035
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 2,335 | 1,654
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 2,335 | 1,654
Preferred Stock Of Government Sponsored Entities Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 2,335 | 1,654
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,115 | 45,963
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Trust Preferred Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,115 | 45,963
Trust Preferred Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 10,115 | 45,963
Trading Securities Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 2
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 4,703 | 4,540
Trading Securities Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Trading Securities Member | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Total Assets | 4,703 | 4,542
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 104 | 218
Warrant [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Total Assets | 104 | 218
Option Contracts Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Option Contracts Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 34
Liabilities |  |
Total Liabilities | 2 | 5
Option Contracts Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Option Contracts Member | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 34
Liabilities |  |
Total Liabilities | 2 | 5
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 2,924 | 2,151
Liabilities |  |
Total Liabilities | 1,586 | 486
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Total Assets | 2,924 | 2,151
Liabilities |  |
Total Liabilities | 1,586 | 486
U.S. Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
U.S. Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 501,226
U.S. Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
U.S. Government Sponsored Entities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 501,226
U.S. Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 501,226
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 1,928
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
State and Municipal Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 1,928
State and Municipal Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 1,928
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 2,960
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
Other Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 2,960
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 2,960
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities |  |
Total Liabilities |  | 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Total Liabilities |  | 2,634
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities |  |
Total Liabilities |  | 0
Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Liabilities |  |
Total Liabilities |  | 2,634
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 526,165 | 54,958
Total Assets | 16,194 | 54,960
Liabilities |  |
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 765,315 | 1,239,520
Total Assets | 1,282,913 | 1,246,245
Liabilities |  |
Total Liabilities | 1,588 | 3,125
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Total Assets | 104 | 218
Liabilities |  |
Total Liabilities | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,291,480 | 1,294,478
Total Assets | 1,299,211 | 1,301,423
Liabilities |  |
Total Liabilities | $ 1,588 | $ 3,125

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