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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Amortized Cost  
Due in one year or less $ 53,510
Due from one year to five years 27,178
Due from five years to ten years 113,529
Due after ten years 432,774
Amortized cost, before securities without debt maturities 626,991
Amortized Cost 2,524,160
Estimated Fair Value  
Due in one year or less 53,729
Due from one year to five years 27,785
Due from five years to ten years 113,708
Due after ten years 408,714
Available for sale securities, debt maturities, before securities without single maturities 603,936
Estimated Fair Value 2,483,443
Collateralized Mortgage Obligations [Member]  
Amortized Cost  
Available-for-sale securities, amortized cost without single maturity date 575,596
Estimated Fair Value  
Available-for-sale securities, debt maturities, without single maturity date, fair value 565,886
Mortgage-Backed Securities [Member]  
Amortized Cost  
Available-for-sale securities, amortized cost without single maturity date 1,321,573
Estimated Fair Value  
Available-for-sale securities, debt maturities, without single maturity date, fair value $ 1,313,621