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Investment Securities and Equity Securities with Readily Determinable Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Held-to-maturity securities    
Amortized cost $ 2,400 $ 1,200
Estimated fair value 2,400 1,200
Carrying Value 2,400 1,200
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,187,248 3,481,165
Gross Unrealized Gains 22,821  
Gross Unrealized Losses (17,197)  
Available for sale debt securities 3,192,872 3,411,350
Equity Securities 6,172 5,937
Total Amortized cost   3,481,165
Total Gross unrealized gains   9,459
Total Gross unrealized losses   79,274
Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 3,192,872  
Available for sale debt securities and equity securities   3,411,350
Carrying Value    
Available-for-sale securities    
Available for sale debt securities 3,192,872  
Available for sale debt securities and equity securities   3,411,350
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,095,049 3,295,366
Gross Unrealized Gains 19,558 6,813
Gross Unrealized Losses (17,197) (79,169)
Residential mortgage-backed securities | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 3,097,410 3,223,010
Residential mortgage-backed securities | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 3,097,410 3,223,010
Mortgage-backed securities by Ginnie Mae    
Available-for-sale securities    
Available for sale debt securities 514,847 501,293
Mortgage-backed securities by Fannie Mae and Freddie Mac    
Available-for-sale securities    
Available for sale debt securities 2,582,563 2,721,717
Obligations of states and political subdivisions    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 92,199 185,799
Gross Unrealized Gains 3,263 2,646
Gross Unrealized Losses   (105)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 95,462 188,340
Obligations of states and political subdivisions | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 95,462 188,340
Other securities    
Held-to-maturity securities    
Amortized cost 2,400 1,200
Estimated fair value 2,400 1,200
Carrying Value $ 2,400 $ 1,200