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INVESTMENTS (Summary of Amortized Cost and Fair Value of Held to Maturity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost $ 540,349 $ 544,931
Unrealized Gains 1,095 3,134
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (44,927) (37,470)
Held-to-maturity securities, fair value 496,517 510,595
Obligations of U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 7,627 7,593
Unrealized Gains 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (641) (528)
Held-to-maturity securities, fair value 6,986 7,065
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 958 992
Obligations of states and political subdivisions    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 56,333 56,262
Unrealized Gains 331 1,242
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (884) (731)
Held-to-maturity securities, fair value 55,780 56,773
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 5,500 5,600
MBS issued or guaranteed by U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 302,177 304,850
Unrealized Gains 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,030) (21,623)
Held-to-maturity securities, fair value 274,147 283,227
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 33,700 34,600
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 155,040 157,118
Unrealized Gains 249 515
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14,156) (13,497)
Held-to-maturity securities, fair value 141,133 144,136
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 17,900 18,400
Corporate bonds    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 19,172 19,108
Unrealized Gains 515 1,377
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,216) (1,091)
Held-to-maturity securities, fair value 18,471 19,394
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss $ 78 $ 85