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Securities (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Interest receivable | $ $ 59,149   $ 59,149   $ 46,839
Proceeds from Sale of Debt Securities, Available-for-sale | $ $ 0 $ 175,586 $ 194,105 $ 259,554  
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 57   57    
Asset-backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 2   2    
State and Municipal Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 5   5    
Available-for-sale Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Interest receivable | $ $ 12,600   $ 12,600   $ 13,900