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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Available for sale, Amortized Cost    
Due in one year or less $ 2,039  
Due after one year through five years 72,424  
Due after five years through ten years 86,994  
Due after ten years 1,193,603  
Total available-for-sale investment securities 1,355,060  
MBS: 461,289  
Amortized Cost 1,816,349 $ 2,655,594
Available for sale, Fair Value    
Due in one year or less 2,050  
Due after one year through five years 72,561  
Due after five years through ten years 86,038  
Due after ten years 1,114,063  
Total available-for-sale investment securities 1,274,712  
MBS: 458,642  
Total 1,733,354 2,764,325
Held to maturity, Amortized Cost    
Due in one year or less 120  
Due after ten years 870,734  
Due after one year through five years 1,024  
Due after five years through ten years 99,549  
Total held-to-maturity investment securities 971,427  
Mortgage-backed securities 112,245  
Amortized cost 1,083,672 90,780
Held to maturity, Fair Value    
Due in one year or less 120  
Due after one year through five years 1,024  
Due after five years through ten years 97,202  
Due after ten years 762,618  
Total held-to-maturity investment securities 860,964  
Mortgage-backed securities 108,843  
Total $ 969,807 $ 95,235