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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment securities available for sale:    
Investment securities available for sale $ 4,054,197 $ 4,043,446
Trading assets 140,328 69,675
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 138,940 67,660
Fair Value, Inputs, Level 1    
Investment securities available for sale:    
Investment securities available for sale 2,570 2,628
Fair Value, Inputs, Level 2    
Investment securities available for sale:    
Investment securities available for sale 4,051,627 4,040,818
Trading assets 145,808 70,850
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 139,517 68,835
Fair Value, Inputs, Level 3    
Investment securities available for sale:    
Trading assets 3,037 1,538
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 0 313
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities    
Investment securities available for sale:    
Investment securities available for sale 997 996
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities    
Investment securities available for sale:    
Investment securities available for sale 1,573 1,632
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities available for sale    
Investment securities available for sale:    
Investment securities available for sale 2,570 2,628
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC    
Investment securities available for sale:    
Investment securities available for sale 316,674 464,768
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA    
Investment securities available for sale:    
Investment securities available for sale 2,180,010 1,913,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private-label    
Investment securities available for sale:    
Investment securities available for sale 1,018 1,059
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA Commercial Mortgage-Related Securities    
Investment securities available for sale:    
Investment securities available for sale 1,250,978 1,513,277
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FFELP asset backed securities    
Investment securities available for sale:    
Investment securities available for sale 299,947 145,176
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities    
Investment securities available for sale:    
Investment securities available for sale 3,000 3,188
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale    
Investment securities available for sale:    
Investment securities available for sale 4,051,627 4,040,818
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member    
Investment securities available for sale:    
Trading assets 134,361 85,544
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror    
Investment securities available for sale:    
Trading assets 68,916 28,494
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 68,103 28,035
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards    
Investment securities available for sale:    
Trading assets 1,974 2,495
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 1,840 2,339
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts    
Investment securities available for sale:    
Trading assets 69,439 38,686
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 68,997 37,286
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)    
Investment securities available for sale:    
Trading assets 577 1,175
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 577 1,175
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)    
Investment securities available for sale:    
Trading assets 1,685 1,538
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)    
Investment securities available for sale:    
Trading assets 1,352 0
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 0 313
Total commercial | Fair Value, Inputs, Level 2    
Investment securities available for sale:    
Loans Held-for-sale, Fair Value Disclosure 30,452 0
Designated as Hedging Instrument    
Investment securities available for sale:    
Trading assets 500,000  
Designated as Hedging Instrument | Fair Value, Inputs, Level 2    
Investment securities available for sale:    
Interest Rate Fair Value Hedge Derivative at Fair Value, Net $ 4,902 $ 0