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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available for sale, Amortized Cost    
Due in one year or less $ 2,247  
Due after one year through five years 24,972  
Due after five years through ten years 157,846  
Due after ten years 1,573,620  
Total available-for-sale investment securities 1,758,685  
MBS: 358,912  
Amortized Cost 2,117,597 $ 2,655,594
Available for sale, Fair Value    
Due in one year or less 2,265  
Due after one year through five years 25,187  
Due after five years through ten years 155,194  
Due after ten years 1,524,865  
Total available-for-sale investment securities 1,707,511  
MBS: 358,473  
Total 2,065,984 2,764,325
Held to maturity, Amortized Cost    
Due in one year or less 120  
Due after one year through five years 529  
Due after five years through ten years 139  
Due after ten years 385,785  
Total held-to-maturity investment securities 386,573  
Mortgage-backed securities 87,746  
Amortized cost 474,319  
Held to maturity, Fair Value    
Due in one year or less 120  
Due after one year through five years 530  
Due after five years through ten years 140  
Due after ten years 373,960  
Total held-to-maturity investment securities 374,750  
Mortgage-backed securities 87,871  
Total $ 462,621 $ 95,235