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Investment Securities (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Held-to-maturity securities    
Amortized cost $ 1,200,000 $ 2,400,000
Estimated fair value 1,200,000 2,400,000
Carrying Value 1,200,000 2,400,000
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,481,165,000 4,196,263,000
Gross Unrealized Gains 9,459,000  
Gross Unrealized Losses (79,274,000)  
Available for sale debt securities 3,411,350,000 4,124,184,000
Equity Securities 5,937,000 27,886,000
Total Amortized cost 3,481,165,000 4,196,263,000
Total Gross unrealized gains   22,274,000
Total Gross unrealized losses   66,467,000
Available for sale debt securities and equity securities 3,411,350,000  
Assets/liabilities measured at fair value    
Available-for-sale securities    
Total Amortized cost   4,152,070,000
Available for sale debt securities and equity securities 3,411,350,000  
Carrying Value    
Available-for-sale securities    
Available for sale debt securities and equity securities 3,411,350,000 4,152,070,000
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,295,366,000 3,943,092,000
Gross Unrealized Gains 6,813,000 14,110,000
Gross Unrealized Losses (79,169,000) (65,969,000)
Residential mortgage-backed securities | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 3,223,010,000 3,891,233,000
Residential mortgage-backed securities | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 3,223,010,000 3,891,233,000
Mortgage-backed securities by Ginnie Mae    
Available-for-sale securities    
Available for sale debt securities 501,293,000 654,063,000
Mortgage-backed securities by Fannie Mae and Freddie Mac    
Available-for-sale securities    
Available for sale debt securities 2,721,717,000 32,371,700
Obligations of states and political subdivisions    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 185,799,000 225,096,000
Gross Unrealized Gains 2,646,000 7,871,000
Gross Unrealized Losses (105,000) (16,000)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 188,340,000 232,951,000
Obligations of states and political subdivisions | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 188,340,000 232,951,000
Other securities    
Held-to-maturity securities    
Amortized cost 1,200,000 2,400,000
Estimated fair value 1,200,000 2,400,000
Carrying Value $ 1,200,000 2,400,000
Equity securities with readily determinable fair values    
Available-for-sale securities    
Amortized Cost, Equity securities   28,075,000
Gross Unrealized Gains, Equity securities   293,000
Gross Unrealized Losses, Equity securities   (482,000)
Equity securities with readily determinable fair values | Assets/liabilities measured at fair value    
Available-for-sale securities    
Equity Securities   27,886,000
Equity securities with readily determinable fair values | Carrying Value    
Available-for-sale securities    
Equity Securities   $ 27,886,000