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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 3,722  
Due from one year to five years 38,518  
Due from five years to ten years 332,514  
Due after ten years 616,875  
Amortized cost, before securities without debt maturities 991,629  
Amortized Cost 2,274,913  
Estimated Fair Value    
Due in one year or less 3,722  
Due from one year to five years 39,747  
Due from five years to ten years 337,519  
Due after ten years 628,060  
Available for sale securities, debt maturities, before securities without single maturities 1,009,048  
Estimated Fair Value 2,315,541 $ 2,080,294
Amortized Cost    
Due in one year or less 0  
Due from one year to five years 0  
Due from five years to ten years 0  
Due after ten years 0  
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total 0  
Amortized Cost, Held to Maturity 390,069 606,679
Estimated Fair Value    
Due in one year or less 0  
Due from one year to five years 0  
Due from five years to ten years 0  
Due after ten years 0  
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value 0  
Estimated Fair Value, Held to Maturity 403,957 611,419
Collateralized Mortgage Obligations [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 686,577  
Amortized Cost 686,577  
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 700,599  
Estimated Fair Value 700,599  
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 0  
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 0  
Commercial Mortgage Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 413,011  
Amortized Cost 413,011  
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 422,109  
Estimated Fair Value 422,109  
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 0  
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 0  
Mortgage-Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 183,696  
Amortized Cost 183,696  
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 183,785  
Estimated Fair Value 183,785  
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 390,069  
Amortized Cost, Held to Maturity 390,069 450,545
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 403,957  
Estimated Fair Value, Held to Maturity $ 403,957 $ 454,212