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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost    
Due three months or less $ 110,872  
Due after three months through one year 100,763  
Due after one through five years 140,602  
Agency mortgage-backed securities 61,916  
Total 414,153 $ 452,570
Available-for-sale, Estimated Fair Value    
Due 3 months or less 110,511  
Due after three months through one year 99,531  
Due after one through five years 137,411  
Agency mortgage-backed securities 57,021  
Total $ 404,474 $ 442,636