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Note 3 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 209,371,000 |  |  | $ | 823,000 |  |  | $ | (5,717,000 | ) |  | $ | 204,477,000 |
Mortgage-backed securities |  |  | 99,574,000 |  |  |  | 1,083,000 |  |  |  | (399,000 | ) |  |  | 100,258,000 |
Municipal general obligation bonds |  |  | 135,575,000 |  |  |  | 1,003,000 |  |  |  | (328,000 | ) |  |  | 136,250,000 |
Municipal revenue bonds |  |  | 11,022,000 |  |  |  | 112,000 |  |  |  | (17,000 | ) |  |  | 11,117,000 |
Other Investments |  |  | 1,916,000 |  |  |  | 0 |  |  |  | (9,000 | ) |  |  | 1,907,000 |
|  | $ | 457,458,000 |  |  | $ | 3,021,000 |  |  | $ | (6,470,000 | ) |  | $ | 454,009,000 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 108,279,000 |  |  | $ | 263,000 |  |  | $ | (10,065,000 | ) |  | $ | 98,477,000 |
Mortgage-backed securities |  |  | 12,456,000 |  |  |  | 1,102,000 |  |  |  | 0 |  |  |  | 13,558,000 |
Municipal general obligation bonds |  |  | 16,488,000 |  |  |  | 388,000 |  |  |  | (4,000 | ) |  |  | 16,872,000 |
Municipal revenue bonds |  |  | 878,000 |  |  |  | 38,000 |  |  |  | 0 |  |  |  | 916,000 |
Mutual funds |  |  | 1,386,000 |  |  |  | 0 |  |  |  | (31,000 | ) |  |  | 1,355,000 |
|  | $ | 139,487,000 |  |  | $ | 1,791,000 |  |  | $ | (10,100,000 | ) |  | $ | 131,178,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 83,379,000 |  |  | $ | (436,000 | ) |  | $ | 71,673,000 |  |  | $ | (5,281,000 | ) |  | $ | 155,052,000 |  |  | $ | (5,717,000 | )
Mortgage-backed securities |  |  | 72,205,000 |  |  |  | (399,000 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 72,205,000 |  |  |  | (399,000 | )
Municipal general obligation bonds |  |  | 24,844,000 |  |  |  | (328,000 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 24,844,000 |  |  |  | (328,000 | )
Municipal revenue bonds |  |  | 5,438,000 |  |  |  | (17,000 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 5,438,000 |  |  |  | (17,000 | )
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 1,399,000 |  |  |  | (9,000 | ) |  |  | 1,399,000 |  |  |  | (9,000 | )
|  | $ | 185,866,000 |  |  | $ | (1,180,000 | ) |  | $ | 73,072,000 |  |  | $ | (5,290,000 | ) |  | $ | 258,938,000 |  |  | $ | (6,470,000 | )
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 57,117,000 |  |  | $ | (5,798,000 | ) |  | $ | 29,679,000 |  |  | $ | (4,267,000 | ) |  | $ | 86,796,000 |  |  | $ | (10,065,000 | )
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal general obligation bonds |  |  | 295,000 |  |  |  | (4,000 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 295,000 |  |  |  | (4,000 | )
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Mutual funds |  |  | 1,355,000 |  |  |  | (31,000 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 1,355,000 |  |  |  | (31,000 | )
|  | $ | 58,767,000 |  |  | $ | (5,833,000 | ) |  | $ | 29,679,000 |  |  | $ | (4,267,000 | ) |  | $ | 88,446,000 |  |  | $ | (10,100,000 | )
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted |  |  |  |  |  |  |  |  |
|  | Average |  |  | Amortized |  |  | Fair |
|  | Yield |  |  | Cost |  |  | Value |
Due in 2014 |  |  | 1.01% |  |  | $ | 11,072,000 |  |  | $ | 11,082,000 |
Due in 2015 through 2019 |  |  | 1.26 |  |  |  | 182,997,000 |  |  |  | 182,029,000 |
Due in 2020 through 2024 |  |  | 3.01 |  |  |  | 71,801,000 |  |  |  | 71,698,000 |
Due in 2025 and beyond |  |  | 3.63 |  |  |  | 90,098,000 |  |  |  | 87,035,000 |
Mortgage-backed securities |  |  | 1.61 |  |  |  | 99,574,000 |  |  |  | 100,258,000 |
Other investments |  |  | 1.55 |  |  |  | 1,916,000 |  |  |  | 1,907,000 |
|  |  | 2.08% |  |  | $ | 457,458,000 |  |  | $ | 454,009,000 |

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