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Investment Securities and Equity Securities with Readily Determinable Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Held-to-maturity securities    
Amortized cost $ 3,400 $ 2,400
Estimated fair value 3,400 2,400
Carrying Value 3,400 2,400
Available-for-sale securities    
Amortized cost 3,045,135 3,376,070
Available for sale debt securities 3,097,734 3,378,923
Total Amortized cost 3,045,135 3,376,070
Total Gross unrealized gains 56,229 19,467
Total Gross unrealized losses 3,630 16,614
Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities and equity securities 3,097,734 3,378,923
Carrying Value    
Available-for-sale securities    
Available for sale debt securities and equity securities 3,097,734 3,378,923
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost 2,973,842 3,285,623
Gross unrealized gains 53,188 16,534
Gross unrealized losses (3,617) (16,609)
Residential mortgage-backed securities | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 3,023,413 3,285,548
Residential mortgage-backed securities | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 3,023,413 3,285,548
Mortgage-backed securities by Ginnie Mae    
Available-for-sale securities    
Available for sale debt securities 506,404 521,247
Mortgage-backed securities by Fannie Mae and Freddie Mac    
Available-for-sale securities    
Available for sale debt securities 2,517,009 2,714,301
Obligations of states and political subdivisions    
Available-for-sale securities    
Amortized cost 71,293 90,447
Gross unrealized gains 3,041 2,933
Gross unrealized losses (13) (5)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 74,321 93,375
Obligations of states and political subdivisions | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 74,321 93,375
Other securities    
Held-to-maturity securities    
Amortized cost 3,400 2,400
Estimated fair value 3,400 2,400
Carrying Value $ 3,400 $ 2,400