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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Estimated Useful Lives of Assets [Table Text Block] |
Type |  | Estimated Useful Life (years) |
Buildings | 15 | to | 45 |
Building improvements | 5 | to | 20 |
Furniture, fixtures, and equipment | 3 | to | 25 |
Leasehold improvements | Shorter of useful lives or the terms of the leases |
Accounting Standards Update and Change in Accounting Principle [Table Text Block] |
|  | Balance at |  |  | Adjustments due to |  |  | Balance at |
|  | December 31, 2020 |  |  | Adoption of ASC 326 |  |  | January 1, 2021 |
Assets: |  | (In thousands) |
Allowance for credit losses on loans |  | $ | 166,538 |  |  | $ | (1,560 | ) |  | $ | 164,978 |
Deferred tax assets |  |  | 85,610 |  |  |  | 1,319 |  |  |  | 86,929 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for unfunded commitments |  | $ | 5,880 |  |  | $ | 6,018 |  |  | $ | 11,898 |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings, net of tax |  | $ | 2,418,144 |  |  | $ | (3,139 | ) |  | $ | 2,415,005 |

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