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Note 4 - Investment Securities - Summary of Investment Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Less than Twelve Months Estimated Fair Value, available for sale $ 83,611 $ 121,563
Less than Twelve Months Unrealized Losses, available for sale (213) (5,116)
Twelve Months or More Estimated Fair Value, available for sale 176,221 118,611
Twelve Months or More Unrealized Losses (28,516) (26,145)
Total Estimated Fair Value, available for sale 259,832 240,174
Total Unrealized Losses, available for sale (28,729) (31,261)
Less than Twelve Months Estimated Fair Value, held to maturity 1,397 5,054
Less than Twelve Months Unrealized Losses, held to maturity (19) (173)
Twelve Months or More Estimated Fair Value, held to maturity 3,196 0
Twelve Months or More Unrealized Losses, held to maturity (96) 0
Total Estimated Fair Value, held to maturity 4,593 5,054
Total Unrealized Losses, held to maturity (115) (173)
US Government Agencies Debt Securities [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 4,238 354
Less than Twelve Months Unrealized Losses, available for sale (72) (24)
Twelve Months or More Estimated Fair Value, available for sale 3,923 4,141
Twelve Months or More Unrealized Losses (472) (493)
Total Estimated Fair Value, available for sale 8,161 4,495
Total Unrealized Losses, available for sale (544) (517)
SBA Securities [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 5,102 2,411
Less than Twelve Months Unrealized Losses, available for sale (18) (223)
Twelve Months or More Estimated Fair Value, available for sale 2,094 0
Twelve Months or More Unrealized Losses (198) 0
Total Estimated Fair Value, available for sale 7,196 2,411
Total Unrealized Losses, available for sale (216) (223)
Residential Mortgage-Backed Securities [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 0 5,535
Less than Twelve Months Unrealized Losses, available for sale 0 (362)
Twelve Months or More Estimated Fair Value, available for sale 34,652 32,522
Twelve Months or More Unrealized Losses (5,855) (6,390)
Total Estimated Fair Value, available for sale 34,652 38,057
Total Unrealized Losses, available for sale (5,855) (6,752)
Residential Collateralized Mortgage Obligations [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 2,597 27,050
Less than Twelve Months Unrealized Losses, available for sale (37) (1,842)
Twelve Months or More Estimated Fair Value, available for sale 60,275 39,815
Twelve Months or More Unrealized Losses (12,161) (11,014)
Total Estimated Fair Value, available for sale 62,872 66,865
Total Unrealized Losses, available for sale (12,198) (12,856)
Commercial Mortgage-Backed Securities [Member]    
Less than Twelve Months Estimated Fair Value, available for sale   4,871
Less than Twelve Months Unrealized Losses, available for sale   (16)
Twelve Months or More Estimated Fair Value, available for sale   0
Twelve Months or More Unrealized Losses   0
Total Estimated Fair Value, available for sale   4,871
Total Unrealized Losses, available for sale   (16)
Commercial Collateralized Mortgage Obligations [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 18,463 18,741
Less than Twelve Months Unrealized Losses, available for sale (70) (790)
Twelve Months or More Estimated Fair Value, available for sale 35,077 22,949
Twelve Months or More Unrealized Losses (2,594) (2,111)
Total Estimated Fair Value, available for sale 53,540 41,690
Total Unrealized Losses, available for sale (2,664) (2,901)
Commercial Paper [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 53,211 [1] 39,624 [2]
Less than Twelve Months Unrealized Losses, available for sale (16) [1] (16) [2]
Twelve Months or More Estimated Fair Value, available for sale 0 0
Twelve Months or More Unrealized Losses 0 0
Total Estimated Fair Value, available for sale 53,211 [1] 39,624 [2]
Total Unrealized Losses, available for sale (16) [1] (16) [2]
Corporate Debt Securities [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 0 22,977
Less than Twelve Months Unrealized Losses, available for sale 0 (1,843)
Twelve Months or More Estimated Fair Value, available for sale 30,691 10,330
Twelve Months or More Unrealized Losses (4,109) (2,322)
Total Estimated Fair Value, available for sale 30,691 33,307
Total Unrealized Losses, available for sale (4,109) (4,165)
Municipal Bonds [Member]    
Less than Twelve Months Estimated Fair Value, available for sale 0 0
Less than Twelve Months Unrealized Losses, available for sale 0 0
Twelve Months or More Estimated Fair Value, available for sale 9,509 8,854
Twelve Months or More Unrealized Losses (3,127) (3,815)
Total Estimated Fair Value, available for sale 9,509 8,854
Total Unrealized Losses, available for sale (3,127) (3,815)
Less than Twelve Months Estimated Fair Value, held to maturity 1,397 4,556
Less than Twelve Months Unrealized Losses, held to maturity (19) (170)
Twelve Months or More Estimated Fair Value, held to maturity 3,196 0
Twelve Months or More Unrealized Losses, held to maturity (96) 0
Total Estimated Fair Value, held to maturity 4,593 4,556
Total Unrealized Losses, held to maturity $ (115) (170)
Taxable Municipal Bonds [Member]    
Less than Twelve Months Estimated Fair Value, held to maturity   498
Less than Twelve Months Unrealized Losses, held to maturity   (3)
Twelve Months or More Estimated Fair Value, held to maturity   0
Twelve Months or More Unrealized Losses, held to maturity   0
Total Estimated Fair Value, held to maturity   498
Total Unrealized Losses, held to maturity   $ (3)
[1] The Company held $19.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2023.
[2] The Company held $9.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2022.