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Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due within one year $ 26,102  
Due after one year but within five years 152,051  
Due after five years but within ten years 87,703  
Due after ten years 1,000  
Mortgage-backed securities 2,632,054  
Amortized Cost 2,898,910 $ 2,662,481
Fair Value    
Due within one year 26,381  
Due after one year but within five years 151,996  
Due after five years but within ten years 79,832  
Due after ten years 928  
Mortgage-backed securities 2,425,911  
Total securities 2,685,048 2,630,414
Amortized Cost    
Due within one year 436  
Due after one year but within five years 0  
Due after five years but within ten years 17,141  
Due after ten years 509,851  
Mortgage-backed securities 18,662  
Amortized Cost 546,090 513,825
Fair Value    
Due within one year 440  
Due after one year but within five years 0  
Due after five years but within ten years 15,988  
Due after ten years 457,366  
Mortgage-backed securities 18,513  
Total securities $ 492,307 $ 511,699