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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - Due within one year $ 10,724  
Amortized Cost - Due after one year through five years 7,472  
Amortized Cost - Due after five years through ten years 40,905  
Amortized Cost - Due after ten years 53,154  
Amortized Cost 1,606,334 $ 1,582,309
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - Due within one year 10,725  
Estimated Fair Value - Due after one year through five years 7,630  
Estimated Fair Value - Due after five years through ten years 40,891  
Estimated Fair Value - Due after ten years 52,319  
Estimated Fair Value 1,583,946 1,556,740
Available-for-sale Securities, Restricted 366,100 382,100
Trust Preferred Security [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost 4,564 11,576
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value 4,313 11,127
GSE collateralized mortgage obligations    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - no single maturity date 736,000  
Amortized Cost 736,000 715,981
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - no single maturity date 726,619  
Estimated Fair Value 726,619 705,667
GSE mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - no single maturity date 744,654  
Amortized Cost 744,654 741,304
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - no single maturity date 732,692  
Estimated Fair Value 732,692 728,041
Mutual funds - GSE mortgage related securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - no single maturity date 13,425  
Amortized Cost 13,425 13,425
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - no single maturity date 13,070  
Estimated Fair Value $ 13,070 $ 13,058