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Investment Securities (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Investments_In_Single_Issuer
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Investment [Line Items]        
Equity Securities, FV-NI, Cost $ 2,500      
Equity Securities, FV-NI 2,585 $ 48,838    
Equity securities redeemed for cash due to a third-party merger 39,900      
Equity Securities, FV-NI, Unrealized Gain (Loss) (332)      
Equtiy Securities without Readily Determinable Fair Values 1,824 1,753    
U.S. Treasury inflation-protected securities held 434,400      
Auction rate securities held at fair value $ 14,200      
Percentage decrease requiring a review for impairment 20.00%      
Fair value of securities on other-than-temporary impairment watch list $ 57,700 68,000    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 14,092 14,199 $ 14,080 $ 14,129
Portfolio securities aggregate fair value loss position 5,435,496 5,172,412    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 99,824 44,122    
Available for sale securities in loss position at period end, change in unrealized loss 55,700      
Securities pledged as collateral 4,300,000 3,800,000    
Securities pledged and may be sold or re-pledged $ 463,300      
Number of investments in a single issuer that exceed 10% of stockholder's equity | Investments_In_Single_Issuer 0      
No investment in a single issuer exceeds this percentage of stockholder's equity 10.00%      
Non-agency mortgage-backed securities [Member]        
Investment [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 14,100      
Par value securities with other-than-temporary impairment 23,400      
Fair Value Securities with Other-Than-Temporary Impairment 18,400      
Portfolio securities aggregate fair value loss position 865,191 730,830    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 12,779 $ 4,837    
Accounting Standards Update 2016-01 [Member]        
Investment [Line Items]        
Unrealized gain previously recorded in AOCI reclassified to retained earnings at adoption of ASU 2016-01 $ (33,320)