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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Securities available-for-sale [Abstract]      
Amortized Cost $ 3,241,683,000   $ 3,491,633,000
Gross Unrealized Gains 108,924,000   66,147,000
Gross Unrealized Losses 40,329,000   17,785,000
Securities available-for-sale, at fair value 3,310,278,000   3,539,995,000
Available-for-sale, Amortized Cost [Abstract]      
Due in one year or less 73,636,000    
Due in one year to five years 9,378,000    
Due in five years to ten years 173,763,000    
Due after ten years 1,180,492,000    
Mortgage-backed securities 1,661,910,000    
Asset-backed securities 142,504,000    
Amortized Cost 3,241,683,000    
Available-for-sale, Fair Value [Abstract]      
Due in one year or less 73,774,000    
Due in one year to five years 9,640,000    
Due in five years to ten years 174,310,000    
Due after ten years 1,173,693,000    
Mortgage-backed securities 1,738,446,000    
Asset-backed securities 140,415,000    
Securities available-for-sale, at fair value 3,310,278,000   3,539,995,000
Securities held-to-maturity [Abstract]      
Amortized Cost 1,048,223,000   188,996,000
Allowance for credit losses - securities held-to-maturity (188,000) $ (10,000) 0
HeldToMaturitySecurities, net of allowance for credit losses 1,048,035,000   188,996,000
Gross Unrealized Gains 19,387,000   12,221,000
Gross Unrealized Losses 6,377,000   0
Securities held-to-maturity, fair value 1,061,233,000   201,217,000
Held-to-maturity, Amortized Cost [Abstract]      
Due in one year or less 0    
Due in one year to five years 1,000,000    
Due in five years to ten years 2,905,000    
Due after ten years 1,044,318,000    
Mortgage-backed securities 0    
Asset-backed securities 0    
Amortized Cost 1,048,223,000   188,996,000
Held-to-maturity, Fair Value [Abstract]      
Due in one year or less 0    
Due in one year to five years 1,047,000    
Due in five years to ten years 2,979,000    
Due after ten years 1,057,207,000    
Mortgage-backed securities 0    
Asset-backed securities 0    
Fair Value 1,061,233,000   201,217,000
U.S. Treasury securities      
Securities available-for-sale [Abstract]      
Amortized Cost 72,482,000   72,862,000
Gross Unrealized Gains 130,000   19,000
Gross Unrealized Losses 0   14,000
Securities available-for-sale, at fair value 72,612,000   72,867,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value 72,612,000   72,867,000
U.S. government agency securities      
Securities available-for-sale [Abstract]      
Amortized Cost 74,939,000   80,096,000
Gross Unrealized Gains 1,404,000   306,000
Gross Unrealized Losses 32,000   710,000
Securities available-for-sale, at fair value 76,311,000   79,692,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value 76,311,000   79,692,000
Mortgage-backed securities      
Securities available-for-sale [Abstract]      
Amortized Cost 1,661,910,000   1,458,894,000
Gross Unrealized Gains 77,923,000   12,789,000
Gross Unrealized Losses 1,387,000   7,776,000
Securities available-for-sale, at fair value 1,738,446,000   1,463,907,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value 1,738,446,000   1,463,907,000
State and municipal securities      
Securities available-for-sale [Abstract]      
Amortized Cost 1,182,925,000   1,669,606,000
Gross Unrealized Gains 28,447,000   52,096,000
Gross Unrealized Losses 31,643,000   7,249,000
Securities available-for-sale, at fair value 1,179,729,000   1,714,453,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value 1,179,729,000   1,714,453,000
Securities held-to-maturity [Abstract]      
Amortized Cost 1,048,223,000   188,996,000
Gross Unrealized Gains 19,387,000   12,221,000
Gross Unrealized Losses 6,377,000   0
Securities held-to-maturity, fair value 1,061,233,000   201,217,000
Held-to-maturity, Amortized Cost [Abstract]      
Amortized Cost 1,048,223,000   188,996,000
Held-to-maturity, Fair Value [Abstract]      
Fair Value 1,061,233,000   201,217,000
Asset-backed securities      
Securities available-for-sale [Abstract]      
Amortized Cost 142,504,000   153,963,000
Gross Unrealized Gains 521,000   302,000
Gross Unrealized Losses 2,610,000   1,293,000
Securities available-for-sale, at fair value 140,415,000   152,972,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value 140,415,000   152,972,000
Corporate notes and other      
Securities available-for-sale [Abstract]      
Amortized Cost 106,923,000   56,212,000
Gross Unrealized Gains 499,000   635,000
Gross Unrealized Losses 4,657,000   743,000
Securities available-for-sale, at fair value 102,765,000   56,104,000
Available-for-sale, Fair Value [Abstract]      
Securities available-for-sale, at fair value $ 102,765,000   $ 56,104,000