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Note 6 - Investment Securities - Summary of Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mortgage backed securities $ 72,334 $ 115,852
Held to maturity, unrealized loss position, less than 12 months, fair value 0 32,941
Mortgage backed securities 2,344 12,865
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 0 2,113
Mortgage backed securities 123,707 85,470
Held to maturity, unrealized loss position, 12 months or more, fair value 375,952 342,351
Mortgage backed securities 35,591 28,274
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 26,285 29,185
Mortgage backed securities 196,041 201,322
Held to maturity, unrealized loss position, fair value 375,952 375,292
Mortgage backed securities 37,935 41,139
Held to maturity, unrealized loss position, unrealized losses 26,285 31,298
Collateralized Mortgage-Backed Securities [Member]    
Mortgage backed securities 55,492 70,652
Held to maturity, unrealized loss position, less than 12 months, fair value 0 17,882
Mortgage backed securities 1,878 3,838
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 0 1,332
Mortgage backed securities 36,256 26,320
Held to maturity, unrealized loss position, 12 months or more, fair value 284,137 267,212
Mortgage backed securities 7,070 6,245
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 21,219 23,322
Mortgage backed securities 91,748 96,972
Held to maturity, unrealized loss position, fair value 284,137 285,094
Mortgage backed securities 8,948 10,083
Held to maturity, unrealized loss position, unrealized losses 21,219 24,654
US Government Agencies Debt Securities [Member]    
Held to maturity, unrealized loss position, less than 12 months, fair value 0 0
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 0 0
Held to maturity, unrealized loss position, 12 months or more, fair value 3,654 3,635
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 364 367
Held to maturity, unrealized loss position, fair value 3,654 3,635
Held to maturity, unrealized loss position, unrealized losses 364 367
State, County and Municipal [Member]    
Mortgage backed securities 16,842 45,200
Held to maturity, unrealized loss position, less than 12 months, fair value 0 15,059
Mortgage backed securities 466 9,027
Held to maturity, unrealized loss position, less than 12 months, unrealized losses 0 781
Mortgage backed securities 87,008 58,713
Held to maturity, unrealized loss position, 12 months or more, fair value 88,161 71,504
Mortgage backed securities 28,464 21,966
Held to maturity, unrealized loss position, 12 months or more, unrealized losses 4,702 5,496
Mortgage backed securities 103,850 103,913
Held to maturity, unrealized loss position, fair value 88,161 86,563
Mortgage backed securities 28,930 30,993
Held to maturity, unrealized loss position, unrealized losses 4,702 6,277
Other Securities [Member]    
Mortgage backed securities 0 0
Mortgage backed securities 0 0
Mortgage backed securities 443 437
Mortgage backed securities 57 63
Mortgage backed securities 443 437
Mortgage backed securities $ 57 $ 63