Note 4 - Investments - Investment Portfolio Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
$ 23,539
|
$ 82,912
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
(385)
|
(726)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
223,806
|
76,470
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(3,955)
|
(1,416)
|
| Securities available-for-sale unrealized loss fair value |
247,345
|
159,382
|
| Securities available-for-sale unrealized loss unrealized losses |
(4,340)
|
(2,142)
|
| Securities held-to-maturity: |
|
|
| Securities held-to-maturity unrealized loss less than 12 months fair value |
4,081
|
23,192
|
| Securities held-to-maturity unrealized loss less than 12 months unrealized losses |
(27)
|
(423)
|
| Securities held-to-maturity unrealized loss 12 months or more fair value |
3,830
|
39,311
|
| Securities held-to-maturity unrealized loss 12 months or more unrealized losses |
(47)
|
(1,005)
|
| Securities held-to-maturity unrealized loss fair value |
7,911
|
62,503
|
| Securities held-to-maturity unrealized loss unrealized losses |
(74)
|
(1,428)
|
| Residential Agency Mortgage Backed Securities [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
0
|
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
0
|
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
138,759
|
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(2,355)
|
|
| Securities available-for-sale unrealized loss fair value |
138,759
|
|
| Securities available-for-sale unrealized loss unrealized losses |
(2,355)
|
|
| Collateralized Debt Obligations [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
0
|
43,563
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
0
|
(306)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
30,650
|
27,718
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(185)
|
(637)
|
| Securities available-for-sale unrealized loss fair value |
30,650
|
71,281
|
| Securities available-for-sale unrealized loss unrealized losses |
(185)
|
(943)
|
| Securities held-to-maturity: |
|
|
| Securities held-to-maturity unrealized loss less than 12 months fair value |
0
|
4,456
|
| Securities held-to-maturity unrealized loss less than 12 months unrealized losses |
0
|
(53)
|
| Securities held-to-maturity unrealized loss 12 months or more fair value |
3,830
|
0
|
| Securities held-to-maturity unrealized loss 12 months or more unrealized losses |
(47)
|
0
|
| Securities held-to-maturity unrealized loss fair value |
3,830
|
4,456
|
| Securities held-to-maturity unrealized loss unrealized losses |
(47)
|
(53)
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
0
|
4,756
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
0
|
(100)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
15,497
|
0
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(415)
|
0
|
| Securities available-for-sale unrealized loss fair value |
15,497
|
4,756
|
| Securities available-for-sale unrealized loss unrealized losses |
(415)
|
(100)
|
| Securities held-to-maturity: |
|
|
| Securities held-to-maturity unrealized loss less than 12 months fair value |
0
|
18,736
|
| Securities held-to-maturity unrealized loss less than 12 months unrealized losses |
0
|
(370)
|
| Securities held-to-maturity unrealized loss 12 months or more fair value |
0
|
33,925
|
| Securities held-to-maturity unrealized loss 12 months or more unrealized losses |
0
|
(997)
|
| Securities held-to-maturity unrealized loss fair value |
0
|
52,661
|
| Securities held-to-maturity unrealized loss unrealized losses |
0
|
(1,367)
|
| Asset-backed Securities [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
23,539
|
18,651
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
(385)
|
(190)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
37,580
|
45,263
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(830)
|
(735)
|
| Securities available-for-sale unrealized loss fair value |
61,119
|
63,914
|
| Securities available-for-sale unrealized loss unrealized losses |
(1,215)
|
(925)
|
| Securities held-to-maturity: |
|
|
| Securities held-to-maturity unrealized loss less than 12 months fair value |
4,081
|
0
|
| Securities held-to-maturity unrealized loss less than 12 months unrealized losses |
(27)
|
0
|
| Securities held-to-maturity unrealized loss 12 months or more fair value |
0
|
5,386
|
| Securities held-to-maturity unrealized loss 12 months or more unrealized losses |
0
|
(8)
|
| Securities held-to-maturity unrealized loss fair value |
4,081
|
5,386
|
| Securities held-to-maturity unrealized loss unrealized losses |
(27)
|
(8)
|
| Equity Securities [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
0
|
1,157
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
0
|
(93)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
1,320
|
0
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
(170)
|
0
|
| Securities available-for-sale unrealized loss fair value |
1,320
|
1,157
|
| Securities available-for-sale unrealized loss unrealized losses |
$ (170)
|
(93)
|
| Residential Agency Pass-Through Securities [Member] |
|
|
| Securities available-for-sale: |
|
|
| Securities available-for-sale unrealized loss less than 12 months fair value |
|
14,785
|
| Securities available-for-sale unrealized loss less than 12 months unrealized losses |
|
(37)
|
| Securities available-for-sale unrealized loss 12 months or more fair value |
|
3,489
|
| Securities available-for-sale unrealized loss 12 months or more unrealized losses |
|
(44)
|
| Securities available-for-sale unrealized loss fair value |
|
18,274
|
| Securities available-for-sale unrealized loss unrealized losses |
|
$ (81)
|