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Securities - Amortized Cost, Estimated Fair Value and Credit Rating of Corporate Debt Securities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 877,613 $ 772,975
Estimated Fair Value 902,418 $ 777,290
Chase Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 10,000  
Estimated Fair Value $ 9,205  
Credit Rating Moody’s/ S&P Baa1/BBB-  
Wells Fargo Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,495  
Credit Rating Moody’s/ S&P A1/BBB-  
Huntington Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,432  
Credit Rating Moody’s/ S&P Baa2/BB+  
Keycorp Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,513  
Credit Rating Moody’s/ S&P Baa2/BB+  
PNC Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,577  
Credit Rating Moody’s/ S&P Baa1/BBB-  
SunTrust Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,670  
Credit Rating Moody’s/ S&P Not Rated/BBB-  
State Street Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,332  
Estimated Fair Value $ 3,007  
Credit Rating Moody’s/ S&P A3/BBB  
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 38,332  
Estimated Fair Value $ 34,899