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Note 11 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Deposit Composition And Interest Rate [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
(dollars in thousands) |  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Balance |  |  | Rate |  |  | Balance |  |  | Rate |  |  | Balance |  |  | Rate |
Noninterest bearing demand |  | $ | 1,775,684 |  |  |  | - |  |  | $ | 1,405,067 |  |  |  | - |  |  | $ | 1,175,799 |  |  |  | - |
Interest bearing transaction |  |  | 289,122 |  |  |  | 0.16 | % |  |  | 178,797 |  |  |  | 0.16 | % |  |  | 143,628 |  |  |  | 0.13 | %
Savings and money market |  |  | 2,902,560 |  |  |  | 0.54 | % |  |  | 2,835,325 |  |  |  | 0.34 | % |  |  | 2,302,600 |  |  |  | 0.32 | %
Time, $100,000 or more |  |  | 464,842 |  |  |  | 0.95 | % |  |  | 406,570 |  |  |  | 0.77 | % |  |  | 393,132 |  |  |  | 0.68 | %
Other time |  |  | 283,906 |  |  |  | 0.86 | % |  |  | 332,685 |  |  |  | 0.74 | % |  |  | 295,609 |  |  |  | 0.70 | %
Total |  | $ | 5,716,114 |  |  |  |  |  |  | $ | 5,158,444 |  |  |  |  |  |  | $ | 4,310,768 |  |  |  |  |
Investments Classified by Contractual Maturity Date [Table Text Block] |
(dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Three months or less |  | $ | 120,238 |  |  | $ | 88,483 |  |  | $ | 104,482 |
More than three months through six months |  |  | 151,422 |  |  |  | 123,789 |  |  |  | 106,861 |
More than six months through twelve months |  |  | 207,141 |  |  |  | 234,684 |  |  |  | 182,187 |
Over twelve months |  |  | 269,947 |  |  |  | 292,299 |  |  |  | 295,211 |
Total |  | $ | 748,748 |  |  | $ | 739,255 |  |  | $ | 688,741 |
Interest Expense On Deposits [Table Text Block] |
(dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Interest bearing transaction |  | $ | 646 |  |  | $ | 291 |  |  | $ | 178 |
Savings and money market |  |  | 12,038 |  |  |  | 8,185 |  |  |  | 6,265 |
Time, $100,000 or more |  |  | 6,487 |  |  |  | 5,019 |  |  |  | 2,830 |
Other time |  |  | 77 |  |  |  | 848 |  |  |  | 365 |
Total |  | $ | 19,248 |  |  | $ | 14,343 |  |  | $ | 9,638 |

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