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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 639,985 | $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses | 9,198 | 423
Temporarily impaired securities, 12 months or longer, fair value | 28,429 | 48,295
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,435 | 1,036
Temporarily impaired securities, total fair value | 668,414 | 185,867
Temporarily impaired securities, total unrealized losses | 10,633 | 1,459
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 40,952
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 6
Temporarily impaired securities, 12 months or longer, fair value | 0 | 0
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 | 0
Temporarily impaired securities, total fair value | 0 | 40,952
Temporarily impaired securities, total unrealized losses | 0 | 6
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 26,390
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 102
Temporarily impaired securities, 12 months or longer, fair value | 2,337 | 40,009
Temporarily impaired securities, 12 months or longer, unrealized losses | 135 | 444
Temporarily impaired securities, total fair value | 2,337 | 66,399
Temporarily impaired securities, total unrealized losses | 135 | 546
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 527,276 | 1,694
Temporarily impaired securities, less than 12 months, unrealized losses | 6,659 | 23
Temporarily impaired securities, 12 months or longer, fair value | 6,496 | 8,093
Temporarily impaired securities, 12 months or longer, unrealized losses | 755 | 583
Temporarily impaired securities, total fair value | 533,772 | 9,787
Temporarily impaired securities, total unrealized losses | 7,414 | 606
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 8,989 | 10,131
Temporarily impaired securities, less than 12 months, unrealized losses | 417 | 25
Temporarily impaired securities, 12 months or longer, fair value | 128 | 193
Temporarily impaired securities, 12 months or longer, unrealized losses | 13 | 9
Temporarily impaired securities, total fair value | 9,117 | 10,324
Temporarily impaired securities, total unrealized losses | 430 | 34
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 103,720 | 58,405
Temporarily impaired securities, less than 12 months, unrealized losses | 2,122 | 267
Temporarily impaired securities, 12 months or longer, fair value | 19,468 | 0
Temporarily impaired securities, 12 months or longer, unrealized losses | 532 | 0
Temporarily impaired securities, total fair value | 123,188 | 58,405
Temporarily impaired securities, total unrealized losses | $ 2,654 | $ 267

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