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Note 4 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 60,040 | $ 32,018
Securities held-to-maturity, fair value | 63,870 | 29,874
Securities held-to-maturity, gross unrealized gains | 3,830 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 2,144
Securities available for sale, amortized cost, total other securities | 831,687 | 845,332
Securities available for sale, fair value | 825,475 | 822,655
Securities available for sale, gross unrealized gains | 5,831 | 1,454
Securities available for sale, gross unrealized losses | 12,043 | 24,131
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 130,000
Securities available for sale, fair value | 120,543 | 118,535
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 9,457 | 11,465
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 52,101 | 24,065
Securities held-to-maturity, fair value | 55,498 | 22,508
Securities held-to-maturity, gross unrealized gains | 3,397 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 1,557
Securities available for sale, amortized cost, total other securities | 12,849 | 46,231
Securities available for sale, fair value | 13,017 | 46,574
Securities available for sale, gross unrealized gains | 168 | 343
Securities available for sale, gross unrealized losses | 0 | 0
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 52,101 | 24,065
Securities held-to-maturity, fair value | 55,498 | 22,508
Securities held-to-maturity, gross unrealized gains | 3,397 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 1,557
Securities available for sale, fair value | 246,465 | 264,702
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,206 | 11,586
Securities available for sale, fair value | 12,206 | 11,586
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 0 | 0
FNMA [Member] |  |
Securities held-to-maturity, amortized cost | 7,939 | 7,953
Securities held-to-maturity, fair value | 8,372 | 7,366
Securities held-to-maturity, gross unrealized gains | 433 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 587
Securities available for sale, amortized cost, total other securities | 106,773 | 94,069
Securities available for sale, fair value | 107,383 | 91,693
Securities available for sale, gross unrealized gains | 998 | 72
Securities available for sale, gross unrealized losses | 388 | 2,448
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost, total other securities | 100,336 | 88,396
Securities available for sale, fair value | 99,381 | 86,751
Securities available for sale, gross unrealized gains | 5 | 0
Securities available for sale, gross unrealized losses | 960 | 1,645
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,939 | 7,953
Securities held-to-maturity, fair value | 8,372 | 7,366
Securities held-to-maturity, gross unrealized gains | 433 | 0
Securities held-to-maturity, gross unrealized losses | 0 | 587
Securities available for sale, amortized cost, total other securities | 574,978 | 567,863
Securities available for sale, fair value | 579,010 | 557,953
Securities available for sale, gross unrealized gains | 5,658 | 1,111
Securities available for sale, gross unrealized losses | 1,626 | 11,021
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,318 | 1,256
Securities available for sale, fair value | 1,318 | 1,256
Securities available for sale, gross unrealized gains | 0 | 0
Securities available for sale, gross unrealized losses | 0 | 0
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 256,709 | 277,469
Securities available for sale, fair value | 246,465 | 264,702
Securities available for sale, gross unrealized gains | 173 | 343
Securities available for sale, gross unrealized losses | 10,417 | 13,110
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 390,044 | 382,632
Securities available for sale, fair value | 392,525 | 376,340
Securities available for sale, gross unrealized gains | 3,604 | 885
Securities available for sale, gross unrealized losses | 1,123 | 7,177
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 706 | 785
Securities available for sale, fair value | 764 | 826
Securities available for sale, gross unrealized gains | 58 | 41
Securities available for sale, gross unrealized losses | 0 | 0
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 77,455 | 90,377
Securities available for sale, fair value | 78,338 | 89,094
Securities available for sale, gross unrealized gains | 998 | 113
Securities available for sale, gross unrealized losses | $ 115 | $ 1,396

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