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Note 2 - Investment Securities - Summary of Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Available for sale, unrealized loss position, less than 12 months, fair value $ 115,852 $ 556,864
Held to maturity, unrealized loss position, less than 12 months, fair value 32,941  
Available for sale securities, Less than 12 months Fair Value 115,852 556,864
Available for sale, unrealized loss position, less than 12 months, unrealized losses 12,865 15,812
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 2,114  
Available for sale securities, Less than 12 months Unrealized Losses 12,865 15,812
Available for sale, unrealized loss position, 12 months or more, fair value 85,470  
Held to maturity, unrealized loss position, 12 months or more, fair value 342,351  
Available for sale securities, 12 months or more Fair Value   20,598
Available for sale, unrealized loss position, 12 months or more, unrealized losses 28,274 652
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 29,184  
Available for sale securities, 12 months or more Unrealized Losses 28,274 652
Available for sale, unrealized loss position, fair value 201,322 577,462
Held to maturity, unrealized loss position, fair value 375,292  
Available for sale securities, Total Fair Value 201,322 577,462
Available for sale, unrealized loss position, unrealized losses 41,139 16,464
Held to maturity, unrealized loss position, unrealized losses 31,298  
Available for sale securities, Total Unrealized Losses 41,139 16,464
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, unrealized loss position, less than 12 months, fair value 70,652 376,644
Held to maturity, unrealized loss position, less than 12 months, fair value 17,882  
Available for sale securities, Less than 12 months Fair Value 70,652 376,644
Available for sale, unrealized loss position, less than 12 months, unrealized losses 3,838 11,535
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 1,333  
Available for sale securities, Less than 12 months Unrealized Losses 3,838 11,535
Available for sale, unrealized loss position, 12 months or more, fair value 26,320  
Held to maturity, unrealized loss position, 12 months or more, fair value 267,212  
Available for sale securities, 12 months or more Fair Value   19,986
Available for sale, unrealized loss position, 12 months or more, unrealized losses 6,245 645
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 23,321  
Available for sale securities, 12 months or more Unrealized Losses 6,245 645
Available for sale, unrealized loss position, fair value 96,972 396,630
Held to maturity, unrealized loss position, fair value 285,094  
Available for sale securities, Total Fair Value 96,972 396,630
Available for sale, unrealized loss position, unrealized losses 10,083 12,180
Held to maturity, unrealized loss position, unrealized losses 24,654  
Available for sale securities, Total Unrealized Losses 10,083 12,180
US Government Agencies Debt Securities [Member]    
Available for sale, unrealized loss position, less than 12 months, fair value   4,700
Held to maturity, unrealized loss position, less than 12 months, fair value 0  
Available for sale securities, Less than 12 months Fair Value   4,700
Available for sale, unrealized loss position, less than 12 months, unrealized losses   269
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 0  
Available for sale securities, Less than 12 months Unrealized Losses   269
Held to maturity, unrealized loss position, 12 months or more, fair value 3,635  
Available for sale securities, 12 months or more Fair Value   0
Available for sale, unrealized loss position, 12 months or more, unrealized losses   0
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 367  
Available for sale securities, 12 months or more Unrealized Losses   0
Available for sale, unrealized loss position, fair value   4,700
Held to maturity, unrealized loss position, fair value 3,635  
Available for sale securities, Total Fair Value   4,700
Available for sale, unrealized loss position, unrealized losses   269
Held to maturity, unrealized loss position, unrealized losses 367  
Available for sale securities, Total Unrealized Losses   269
State, County and Municipal [Member]    
Available for sale, unrealized loss position, less than 12 months, fair value 45,200 175,520
Held to maturity, unrealized loss position, less than 12 months, fair value 15,059  
Available for sale securities, Less than 12 months Fair Value 45,200 175,520
Available for sale, unrealized loss position, less than 12 months, unrealized losses 9,027 4,008
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 781  
Available for sale securities, Less than 12 months Unrealized Losses 9,027 4,008
Available for sale, unrealized loss position, 12 months or more, fair value 58,713  
Held to maturity, unrealized loss position, 12 months or more, fair value 71,504  
Available for sale securities, 12 months or more Fair Value   119
Available for sale, unrealized loss position, 12 months or more, unrealized losses 21,966 0
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 5,496  
Available for sale securities, 12 months or more Unrealized Losses 21,966 0
Available for sale, unrealized loss position, fair value 103,913 175,639
Held to maturity, unrealized loss position, fair value 86,563  
Available for sale securities, Total Fair Value 103,913 175,639
Available for sale, unrealized loss position, unrealized losses 30,993 4,008
Held to maturity, unrealized loss position, unrealized losses 6,277  
Available for sale securities, Total Unrealized Losses 30,993 4,008
Other Securities [Member]    
Available for sale, unrealized loss position, less than 12 months, fair value 0 0
Available for sale securities, Less than 12 months Fair Value 0 0
Available for sale, unrealized loss position, less than 12 months, unrealized losses 0 0
Available for sale securities, Less than 12 months Unrealized Losses 0 0
Available for sale, unrealized loss position, 12 months or more, fair value 437  
Available for sale securities, 12 months or more Fair Value   493
Available for sale, unrealized loss position, 12 months or more, unrealized losses 63 7
Available for sale securities, 12 months or more Unrealized Losses 63 7
Available for sale, unrealized loss position, fair value 437 493
Available for sale securities, Total Fair Value 437 493
Available for sale, unrealized loss position, unrealized losses 63 7
Available for sale securities, Total Unrealized Losses $ 63 $ 7