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Note 8 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
|  | December 31, 2016 |  |  | December 31, 2015 |  |  | Percent Increase |
|  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | (Decrease) |
Noninterest-bearing demand |  | $ | 810,600,000 |  |  |  | 34.1 | % |  | $ | 674,568,000 |  |  |  | 29.6 | % |  |  | 20.2 | %
Interest-bearing checking |  |  | 377,929,000 |  |  |  | 15.9 |  |  |  | 403,354,000 |  |  |  | 17.7 |  |  |  | (6.3 | )
Money market |  |  | 272,051,000 |  |  |  | 11.5 |  |  |  | 274,395,000 |  |  |  | 12.1 |  |  |  | (0.9 | )
Savings |  |  | 344,988,000 |  |  |  | 14.5 |  |  |  | 332,794,000 |  |  |  | 14.6 |  |  |  | 3.7 |
Time, under $100,000 |  |  | 146,169,000 |  |  |  | 6.2 |  |  |  | 155,655,000 |  |  |  | 6.9 |  |  |  | (6.1 | )
Time, $100,000 and over |  |  | 347,058,000 |  |  |  | 14.6 |  |  |  | 313,247,000 |  |  |  | 13.8 |  |  |  | 10.8 |
Total local deposits |  |  | 2,298,795,000 |  |  |  | 96.8 |  |  |  | 2,154,013,000 |  |  |  | 94.7 |  |  |  | 6.7 |
Out-of-area time, under $100,000 |  |  | 0 |  |  |  | NM |  |  |  | 149,000 |  |  | < 0.1 |  |  |  | NM |
Out-of-area time, $100,000 and over |  |  | 76,190,000 |  |  |  | 3.2 |  |  |  | 121,220,000 |  |  |  | 5.3 |  |  |  | (37.1 | )
Total out-of-area deposits |  |  | 76,190,000 |  |  |  | 3.2 |  |  |  | 121,369,000 |  |  |  | 5.3 |  |  |  | (37.2 | )
Total deposits |  | $ | 2,374,985,000 |  |  |  | 100.0 | % |  | $ | 2,275,382,000 |  |  |  | 100.0 | % |  |  | 4.4 | %
Contractual Maturities of Certificates of Deposits [Table Text Block] |
|  | 2016 |  |  | 2015 |
In one year or less |  | $ | 358,259,000 |  |  | $ | 305,122,000 |
In one to two years |  |  | 92,042,000 |  |  |  | 145,775,000 |
In two to three years |  |  | 34,204,000 |  |  |  | 71,988,000 |
In three to four years |  |  | 35,523,000 |  |  |  | 37,527,000 |
In four to five years |  |  | 49,389,000 |  |  |  | 29,859,000 |
Total certificates of deposit |  | $ | 569,417,000 |  |  | $ | 590,271,000 |
Contractual Maturities of Certificates of Deposits of More than Specified Amount [Table Text Block] |
|  | 2016 |  |  | 2015 |
Up to three months |  | $ | 101,444,000 |  |  | $ | 73,783,000 |
Three months to six months |  |  | 87,277,000 |  |  |  | 50,375,000 |
Six months to twelve months |  |  | 79,656,000 |  |  |  | 91,786,000 |
Over twelve months |  |  | 154,871,000 |  |  |  | 218,523,000 |
Total certificates of deposit |  | $ | 423,248,000 |  |  | $ | 434,467,000 |

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