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Investment Securities (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Held-to-maturity securities    
Amortized cost $ 2,400,000 $ 1,200,000
Estimated fair value 2,400,000 1,200,000
Carrying Value 2,400,000 1,200,000
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,376,070,000 3,481,165,000
Gross Unrealized Gains 19,467,000  
Gross Unrealized Losses (16,614,000)  
Available for sale debt securities 3,378,923,000 3,411,350,000
Equity Securities 6,095,000 5,937,000
Total Amortized cost 3,376,070,000 3,481,165,000
Total Gross unrealized gains   9,459,000
Total Gross unrealized losses   79,274,000
Available for sale debt securities and equity securities 3,378,923,000  
Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities and equity securities 3,378,923,000 3,411,350,000
Carrying Value    
Available-for-sale securities    
Available for sale debt securities and equity securities 3,378,923,000 3,411,350,000
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 3,285,623,000 3,295,366,000
Gross Unrealized Gains 16,534,000 6,813,000
Gross Unrealized Losses (16,609,000) (79,169,000)
Residential mortgage-backed securities | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 3,285,548,000 3,223,010,000
Residential mortgage-backed securities | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 3,285,548,000 3,223,010,000
Mortgage-backed securities by Ginnie Mae    
Available-for-sale securities    
Available for sale debt securities 571,247,000 501,293,000
Mortgage-backed securities by Fannie Mae and Freddie Mac    
Available-for-sale securities    
Available for sale debt securities 2,714,301,000 2,721,717
Obligations of states and political subdivisions    
Available-for-sale securities    
Amortized cost, Available-for-sale securities 90,447,000 185,799,000
Gross Unrealized Gains 2,933,000 2,646,000
Gross Unrealized Losses (5,000) (105,000)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value    
Available-for-sale securities    
Available for sale debt securities 93,375,000 188,340,000
Obligations of states and political subdivisions | Carrying Value    
Available-for-sale securities    
Available for sale debt securities 93,375,000 188,340,000
Other securities    
Held-to-maturity securities    
Amortized cost 2,400,000 1,200,000
Estimated fair value 2,400,000 1,200,000
Carrying Value $ 2,400,000 $ 1,200,000