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Note 20 - Financial Instruments with Off-Balance Sheet Risk (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] |
(dollars in thousands) |  | 2016 |  |  | 2015 |
Unfunded loan commitments |  | $ | 2,225,995 |  |  | $ | 1,891,934 |
Unfunded lines of credit |  |  | 94,375 |  |  |  | 112,159 |
Letters of credit |  |  | 72,084 |  |  |  | 83,511 |
Total |  | $ | 2,392,454 |  |  | $ | 2,087,604 |

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