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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year or less $ 30,176  
Due after one year through five years 41,687  
Due after five years through ten years 58,981  
Due after ten years 113,155  
Total investment securities due at a single maturity date 243,999  
Mortgage-backed securities 1,216,034  
Amortized Cost 1,460,033 $ 883,832
Fair Value    
Due in one year or less 29,723  
Due after one year through five years 39,777  
Due after five years through ten years 55,552  
Due after ten years 95,667  
Total investment securities due at a single maturity date 220,719  
Mortgage-backed securities 1,110,724  
Fair Value 1,331,443 894,335
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 83,227  
Due after ten years 67,709  
Total investment securities due at a single maturity date 150,936  
Mortgage-backed securities 615,460  
Total investment securities 766,396 $ 383,393
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 67,817  
Due after ten years 49,534  
Total investment securities due at a single maturity date 117,351  
Mortgage-backed securities 556,083  
Total investment securities $ 673,434