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Securities, HTM Debt Securities, Contractual Maturities (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Issuer
Dec. 31, 2019
USD ($)
Issuer
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Within one year $ 17,239  
From one to five years 60,391  
From five to ten years 241,783  
After ten years 343,675  
Amortized cost 663,088 $ 630,074
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Within one year 17,257  
From one to five years 61,713  
From five to ten years 248,329  
After ten years 357,563  
Fair value $ 684,862 $ 641,262
Number of issuers whose holdings exceeded 10% of consolidated stockholders' equity, excluding U.S. Government securities and Government-sponsored enterprises securities | Issuer 0 0