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Note 2 - Acquisition (Details) - Fair Value of Assets and Liabilities Acquired - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Assets acquired: |  |  |
Goodwill |  | $ 373,208 | $ 316,340
Asia Bancshares [Member] |  |  |
Assets acquired: |  |  |
Cash and cash equivalents | $ 63,579 |  |
Securities available-for-sale | 2,370 |  |
Loans | 417,570 |  |
Premises and equipment | 13,291 |  |
Other real estate owned | 3,048 |  |
Goodwill | 56,867 |  |
Core deposit intangible | 1,302 |  |
Accrued interest receivable and other assets | 3,515 |  |
Total assets acquired | 561,542 |  |
Liabilities assumed: |  |  |
Deposits | 420,623 |  |
Accrued interest payable and other liabilities | 1,056 |  |
Total liabilities assumed | 421,679 |  |
Net assets acquired | 139,863 |  |
Cash paid | 57,006 |  |
Fair value of common stock issued | 82,857 | $ 82,800 |
Total consideration paid | $ 139,863 |  |

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