Note 3 - Investment Securities - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Available for Sale Securities - Amortized Cost |
$ 486,038
|
$ 577,248
|
| Available for Sale Securities - Gross Unrealized Gains |
2,518
|
8,186
|
| Available for Sale Securities - Gross Unrealized Losses |
7,692
|
3,232
|
| Available-for-sale Securities |
480,864
|
582,202
|
| Held to Maturity Securities - Amortized Cost |
3,488
|
3,611
|
| Held to Maturity Securities - Estimated Fair Value |
3,597
|
3,809
|
| US Government-sponsored Enterprises Debt Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
71,941
|
107,135
|
| Available for Sale Securities - Gross Unrealized Gains |
213
|
309
|
| Available for Sale Securities - Gross Unrealized Losses |
460
|
538
|
| Available-for-sale Securities |
71,694
|
106,906
|
| US States and Political Subdivisions Debt Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
134,055
|
147,875
|
| Available for Sale Securities - Gross Unrealized Gains |
773
|
2,604
|
| Available for Sale Securities - Gross Unrealized Losses |
2,536
|
213
|
| Available-for-sale Securities |
132,292
|
150,266
|
| Held to Maturity Securities - Amortized Cost |
3,488
|
3,611
|
| Held to Maturity Securities - Gross Unrealized Gains |
109
|
198
|
| Held to Maturity Securities - Gross Unrealized Losses |
0
|
0
|
| Held to Maturity Securities - Estimated Fair Value |
3,597
|
3,809
|
| Residential Mortgage Backed Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
225,489
|
294,140
|
| Available for Sale Securities - Gross Unrealized Gains |
1,505
|
5,210
|
| Available for Sale Securities - Gross Unrealized Losses |
2,687
|
1,489
|
| Available-for-sale Securities |
224,307
|
297,861
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
47,164
|
20,655
|
| Available for Sale Securities - Gross Unrealized Gains |
6
|
52
|
| Available for Sale Securities - Gross Unrealized Losses |
1,557
|
123
|
| Available-for-sale Securities |
45,613
|
20,584
|
| Corporate Debt Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
6,565
|
6,629
|
| Available for Sale Securities - Gross Unrealized Gains |
1
|
11
|
| Available for Sale Securities - Gross Unrealized Losses |
441
|
800
|
| Available-for-sale Securities |
6,125
|
5,840
|
| Mutual Funds and Equity Securities [Member] |
|
|
| Available for Sale Securities - Amortized Cost |
824
|
814
|
| Available for Sale Securities - Gross Unrealized Gains |
20
|
|
| Available for Sale Securities - Gross Unrealized Losses |
11
|
69
|
| Available-for-sale Securities |
$ 833
|
$ 745
|