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Note 3 - INVESTMENT SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities held to maturity:    
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 $ 385,571  
Securities held to maturity, less than 12 months, gross unrealized losses (30,028)  
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 385,571  
Securities held to maturity, gross unrealized losses (30,028)  
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 286,106 $ 32,980
Securities available for sale, less than 12 months, gross unrealized losses (59,576) (464)
Securities available for sale, 12 months or more, fair value 35,631 23,442
Securities available for sale, 12 months or more, gross unrealized losses (9,617) (857)
Securities available for sale, fair value 321,737 56,422
Securities available for sale, gross unrealized losses (69,193) (1,321)
Municipal securities.    
Securities held to maturity:    
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 385,027 1,049
Securities held to maturity, less than 12 months, gross unrealized losses (30,022) (1)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 385,027 1,049
Securities held to maturity, gross unrealized losses (30,022) (1)
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 175,686 13,287
Securities available for sale, less than 12 months, gross unrealized losses (53,159) (211)
Securities available for sale, 12 months or more, fair value 6,536 1,001
Securities available for sale, 12 months or more, gross unrealized losses (2,813) (4)
Securities available for sale, fair value 182,222 14,288
Securities available for sale, gross unrealized losses (55,972) (215)
U.S. treasuries and govt. sponsored agency securities    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 8,705 9,802
Securities available for sale, less than 12 months, gross unrealized losses (349) (156)
Securities available for sale, 12 months or more, fair value 10,530 3,035
Securities available for sale, 12 months or more, gross unrealized losses (2,535) (140)
Securities available for sale, fair value 19,235 12,837
Securities available for sale, gross unrealized losses (2,884) (296)
Residential mortgage-backed and related securities    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 51,073 5,363
Securities available for sale, less than 12 months, gross unrealized losses (3,671) (67)
Securities available for sale, 12 months or more, fair value 17,669 19,406
Securities available for sale, 12 months or more, gross unrealized losses (4,165) (713)
Securities available for sale, fair value 68,742 24,769
Securities available for sale, gross unrealized losses (7,836) (780)
Asset-backed securities    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 10,742  
Securities available for sale, less than 12 months, gross unrealized losses (194)  
Securities available for sale, fair value 10,742  
Securities available for sale, gross unrealized losses (194)  
Other Securities    
Securities held to maturity:    
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1 544  
Securities held to maturity, less than 12 months, gross unrealized losses (6)  
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1 544  
Securities held to maturity, gross unrealized losses (6)  
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 39,900 4,528
Securities available for sale, less than 12 months, gross unrealized losses (2,203) (30)
Securities available for sale, 12 months or more, fair value 896  
Securities available for sale, 12 months or more, gross unrealized losses (104)  
Securities available for sale, fair value 40,796 4,528
Securities available for sale, gross unrealized losses $ (2,307) $ (30)