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Note 11 - Fair Value Measurements (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Securities available-for-sale |  |
Securities Available-for-Sale | $ 2,190,296 | $ 1,291,480
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 360,114 | 509,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
US Treasury Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 360,114 | 509,971
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 360,114 | 509,971
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 | 63,458 |
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 | 63,458 |
State and Municipal Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 63,458 |
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 | 1,490,598 | 416,694
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 | 1,490,598 | 416,694
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,490,598 | 416,694
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 | 8,946 | 10,168
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 | 8,946 | 10,168
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 8,946 | 10,168
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 | 132 | 141
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 | 132 | 141
Asset-backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 132 | 141
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 | 256,457 | 335,977
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 | 256,457 | 335,977
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 256,457 | 335,977
Mutual Funds Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,035 | 6,079
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 | 6,035 | 6,079
Mutual Funds Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,035 | 6,079
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 | 4,556 | 2,335
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 | 4,556 | 2,335
Preferred Stock Of Government Sponsored Entities Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 4,556 | 2,335
Trading Securities Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 4,758 | 4,703
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 | 4,758 | 4,703
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 | 98 | 104
Warrant [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Total Assets | 98 | 104
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 | 8 | 0
Liabilities |  |
Total Liabilities | 2 | 2
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 | 8 | 0
Liabilities |  |
Total Liabilities | 2 | 2
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 | 2,987 | 2,924
Liabilities |  |
Total Liabilities | 1,850 | 1,586
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 | 2,987 | 2,924
Liabilities |  |
Total Liabilities | 1,850 | 1,586
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 10,115
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
Trust Preferred Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 10,115
Trust Preferred Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 10,115
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
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 |  | 0
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 366,149 | 526,165
Total Assets | 366,149 | 526,165
Liabilities |  |
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,824,147 | 765,315
Total Assets | 1,831,900 | 772,942
Liabilities |  |
Total Liabilities | 1,852 | 1,588
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Total Assets | 98 | 104
Liabilities |  |
Total Liabilities | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 2,190,296 | 1,291,480
Total Assets | 2,198,147 | 1,299,211
Liabilities |  |
Total Liabilities | $ 1,852 | $ 1,588

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