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Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due within one year $ 26,094  
Due after one year but within five years 176,752  
Due after five years but within ten years 87,704  
Due after ten years 1,000  
Mortgage-backed securities 2,564,559  
Amortized Cost 2,856,109 $ 2,662,481
Fair Value    
Due within one year 26,149  
Due after one year but within five years 174,759  
Due after five years but within ten years 76,260  
Due after ten years 907  
Mortgage-backed securities 2,254,549  
Total securities 2,532,624 2,630,414
Amortized Cost    
Due within one year 435  
Due after one year but within five years 998  
Due after five years but within ten years 28,037  
Due after ten years 499,750  
Mortgage-backed securities 17,190  
Amortized Cost 546,410 513,825
Fair Value    
Due within one year 436  
Due after one year but within five years 907  
Due after five years but within ten years 24,715  
Due after ten years 409,846  
Mortgage-backed securities 16,754  
Total securities $ 452,658 $ 511,699