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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]          
Accrued interest receivable $ 23,800   $ 23,800   $ 20,800
Proceeds from sale of available-for-sale securities       $ 491,900  
Net realized gains (loss) resulting from sale of available-for-sale securities 0 $ 0 0 (500)  
Transfers from available for sale securities to held to maturity 312,900 $ 313,000 312,900 313,000  
Gain On Transfer Of securities 0     $ 0  
Financial instruments pledged as collateral $ 735,400   $ 735,400   368,400
Number of available for sale securities whose amortized costs exceeded their fair values | security 55   55    
Available-for-sale Securities, Continuous $ 10,753   $ 10,753    
Available-for-sale Securities, Continuous Unrealized 293   293    
Available-for-sale Securities, Continuous $ 968,836   $ 968,836    
Percentage of available-for-sale portfolio 43.20%   43.20%    
Pledged [Member]          
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]          
Trading securities pledged $ 1,200,000   $ 1,200,000   1,400,000
Other Assets [Member]          
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]          
Accrued interest receivable $ 28,100   $ 28,100   $ 26,000