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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Due within one year $ 4,984  
Due after one year through five years 147,521  
Due after five years through ten years 108,760  
Due after ten years 1,972,469  
Amortized Cost 2,233,734 $ 2,289,421
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]    
Due within one year 4,885  
Due after one year through five years 136,859  
Due after five years through ten years 97,284  
Due after ten years 1,677,558  
Total 1,916,586 1,972,129
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract]    
Due within one year 0  
Due after one year through five years 26,641  
Due after five years through ten years 8,546  
Due after ten years 234,573  
Total 269,760  
Debt Securities, Held-to-Maturity, Fair Value, Maturity [Abstract]    
Due within one year 0  
Due after one year through five years 25,589  
Due after five years through ten years 8,120  
Due after ten years 221,635  
Total 255,344  
Securities, carrying value $ 2,010,000 $ 360,700