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Securities - Amortized Cost, Estimated Fair Value and Credit Rating of Corporate Debt Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 942,314 $ 772,975
Estimated Fair Value 968,466 $ 777,290
Chase Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 10,000  
Estimated Fair Value $ 9,479  
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 $ 4,702  
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 $ 4,546  
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 $ 4,647  
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 $ 4,743  
Credit Rating Moody’s/S&P Baa1/BBB-  
State Street Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,332  
Estimated Fair Value $ 3,147  
Credit Rating Moody’s/S&P A3/BBB  
SunTrust Capital    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,000  
Estimated Fair Value $ 4,671  
Credit Rating Moody’s/S&P Not Rated/BBB-