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Note 4 - Investment Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Unrealized loss position, fair value, less than 12 months | $ 7,742 | $ 241,572
Unrealized loss position, unrealized losses, less than 12 months | (445) | (33,323)
Unrealized loss position, fair value, more than 12 months | 564,374 | 361,297
Unrealized loss position, unrealized losses, more than 12 months | (92,522) | (70,521)
Unrealized loss position, fair value | 572,116 | 602,869
Unrealized loss position, unrealized losses | $ (92,967) | $ (103,844)
Number of securities, less than 12 months | 18 | 272
Number of securities, more than 12 months | 419 | 213
Number of securities | 437 | 485
US Government Agencies Debt Securities [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 0 | $ 9,285
Unrealized loss position, unrealized losses, less than 12 months | 0 | (377)
Unrealized loss position, fair value, more than 12 months | 98,869 | 93,312
Unrealized loss position, unrealized losses, more than 12 months | (13,100) | (13,409)
Unrealized loss position, fair value | 98,869 | 102,597
Unrealized loss position, unrealized losses | $ (13,100) | (13,786)
Number of securities | 46 |
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 4,137 | 170,484
Unrealized loss position, unrealized losses, less than 12 months | (252) | (26,928)
Unrealized loss position, fair value, more than 12 months | 267,258 | 112,353
Unrealized loss position, unrealized losses, more than 12 months | (44,070) | (25,835)
Unrealized loss position, fair value | 271,395 | 282,837
Unrealized loss position, unrealized losses | $ (44,322) | (52,763)
Number of securities | 255 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Unrealized loss position, fair value, less than 12 months | $ 3,605 | 61,803
Unrealized loss position, unrealized losses, less than 12 months | (193) | (6,018)
Unrealized loss position, fair value, more than 12 months | 198,247 | 155,632
Unrealized loss position, unrealized losses, more than 12 months | (35,352) | (31,277)
Unrealized loss position, fair value | 201,852 | 217,435
Unrealized loss position, unrealized losses | $ (35,545) | $ (37,295)
Number of securities | 136 |

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