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Securities Securities - Available for sale (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost $ 3,131,227,000 $ 2,513,540,000
Gross Unrealized Gain 7,934,000 19,244,000
Gross Unrealized Loss 55,475,000 17,501,000
Securities available-for-sale, at fair value 3,083,686,000 2,515,283,000
Available-for-sale, Amortized Cost    
Due in one year of less 47,546,000  
Due in one year to five years 45,037,000  
Due in five to ten years 100,401,000  
Due after ten years 1,222,667,000  
Mortgage-backed securities 1,336,469,000  
Asset-backed securities 379,107,000  
Amortized Cost 3,131,227,000  
Available-for-sale, Fair Value    
Due in one year or less 47,474,000  
Due in one year to five years 44,925,000  
Due in five years to ten years 98,424,000  
Due after ten years 1,206,336,000  
Mortgage-backed securities 1,310,945,000  
Asset-backed securities 375,582,000  
Securities available-for-sale, at fair value 3,083,686,000 2,515,283,000
State and Municipal Securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 1,244,471,000 774,949,000
Gross Unrealized Gain 3,785,000 12,251,000
Gross Unrealized Loss 18,602,000 2,588,000
Securities available-for-sale, at fair value 1,229,654,000 784,612,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value 1,229,654,000 784,612,000
U.S. Government Agency Securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 71,456,000 182,500,000
Gross Unrealized Gain 49,000 67,000
Gross Unrealized Loss 1,346,000 1,766,000
Securities available-for-sale, at fair value 70,159,000 180,801,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value 70,159,000 180,801,000
Mortgage-backed Agency Securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 1,336,469,000 1,270,625,000
Gross Unrealized Gain 3,110,000 5,318,000
Gross Unrealized Loss 28,634,000 12,124,000
Securities available-for-sale, at fair value 1,310,945,000 1,263,819,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value 1,310,945,000 1,263,819,000
US Treasury Securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 30,325,000 30,505,000
Gross Unrealized Gain 0 0
Gross Unrealized Loss 25,000 60,000
Securities available-for-sale, at fair value 30,300,000 30,445,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value 30,300,000 30,445,000
Asset-backed Securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 379,107,000 173,346,000
Gross Unrealized Gain 820,000 262,000
Gross Unrealized Loss 4,345,000 316,000
Securities available-for-sale, at fair value 375,582,000 173,292,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value 375,582,000 173,292,000
Corporate Notes    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 69,399,000 81,615,000
Gross Unrealized Gain 170,000 1,346,000
Gross Unrealized Loss 2,523,000 647,000
Securities available-for-sale, at fair value 67,046,000 82,314,000
Available-for-sale, Fair Value    
Securities available-for-sale, at fair value $ 67,046,000 $ 82,314,000