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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - Due within one year $ 0  
Amortized Cost - Due after one year through five years 2,306  
Amortized Cost - Due after five years through ten years 29,010  
Amortized Cost - Due after ten years 17,132  
Amortized Cost 1,081,209 $ 1,014,060
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - Due within one year 0  
Estimated Fair Value - Due after one year through five years 2,477  
Estimated Fair Value - Due after five years through ten years 30,423  
Estimated Fair Value - Due after ten years 17,014  
Estimated Fair Value 1,099,944 1,010,556
Available-for-sale Securities, Restricted 380,600 359,600
Trust Preferred Security [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost 4,553 4,545
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value 3,713 3,749
GSE collateralized mortgage obligations    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - no single maturity date 524,406  
Amortized Cost 524,406 454,096
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - no single maturity date 531,479  
Estimated Fair Value 531,480 449,980
GSE mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized Cost - no single maturity date 494,930  
Amortized Cost 494,930 497,889
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Estimated Fair Value - no single maturity date 505,010  
Estimated Fair Value 505,010 498,047
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 13,541  
Estimated Fair Value $ 13,541 $ 13,269