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Investments in Securities - Held to maturity securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
HELD-TO-MATURITY SECURITIES:    
Amortized Cost $ 195,088 $ 202,377
Fair Value Adjustment (65) 118
Amortized Carrying Value 195,023 202,495
Gross Unrealized Losses 23,830 24,730
Fair Value 171,193 177,765
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 72,495 73,891
Fair Value Adjustment 2,436 3,015
Amortized Carrying Value 74,931 76,906
Gross Unrealized Losses 8,686 9,820
Fair Value 66,245 67,086
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 116,405 122,247
Fair Value Adjustment (2,502) (2,885)
Amortized Carrying Value 113,903 119,362
Gross Unrealized Losses 14,662 14,129
Fair Value 99,241 105,233
States and political subdivisions    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 6,188 6,239
Fair Value Adjustment 1 (12)
Amortized Carrying Value 6,189 6,227
Gross Unrealized Losses 482 781
Fair Value $ 5,707 $ 5,446