Note 3 - Investment Securities - The Amortized Cost and Estimated Fair Value of the Securities Portfolio by Contractual Maturity (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Available-for-sale, amortized cost, due in one year or less |
$ 19,743
|
|
| Available-for-sale, estimated fair value, due in one year or less |
19,762
|
|
| Held-to-maturity, amortized cost, due in one year or less |
0
|
|
| Held-to-maturity, estimated fair value, due in one year or less |
0
|
|
| Available-for-sale, amortized cost, due after one year through five years |
87,628
|
|
| Available-for-sale, estimated fair value, due after one year through five years |
87,504
|
|
| Held-to-maturity, amortized cost, due after one year through five years |
0
|
|
| Held-to-maturity, estimated fair value, due after one year through five years |
0
|
|
| Available-for-sale, amortized cost, due after five years through ten years |
85,007
|
|
| Available-for-sale, estimated fair value, due after five years through ten years |
83,317
|
|
| Held-to-maturity, amortized cost, due after five years through ten years |
570
|
|
| Held-to-maturity, estimated fair value, due after five years through ten years |
630
|
|
| Available-for-sale, amortized cost, due after ten years |
20,183
|
|
| Available-for-sale, estimated fair value, due after ten years |
19,528
|
|
| Held-to-maturity, amortized cost, due after ten years |
2,918
|
|
| Held-to-maturity, estimated fair value, due after ten years |
2,967
|
|
| Available-for-sale, amortized cost, mortgage-backed securities |
272,653
|
|
| Available-for-sale, estimated fair value, mortgage-backed securities |
269,920
|
|
| Held-to-maturity, amortized cost, mortgage-backed securities |
0
|
|
| Held-to-maturity, estimated fair value, mortgage-backed securities |
0
|
|
| Available-for-sale, amortized cost |
485,214
|
|
| Available-for-sale, estimated fair value |
480,031
|
|
| Held-to-maturity, amortized cost |
3,488
|
$ 3,611
|
| Held-to-maturity, estimated fair value |
$ 3,597
|
$ 3,809
|