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Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,606,334 $ 1,582,309
Gross Unrealized Gains 2,285 1,842
Gross Unrealized Losses (24,673) (27,411)
Estimated Fair Value 1,583,946 1,556,740
Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,002 12,005
Gross Unrealized Gains 0 3
Gross Unrealized Losses (4) 0
Estimated Fair Value 9,998 12,008
GSE collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 736,000 715,981
Gross Unrealized Gains 406 349
Gross Unrealized Losses (9,787) (10,663)
Estimated Fair Value 726,619 705,667
GSE mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 744,654 741,304
Gross Unrealized Gains 1,252 1,132
Gross Unrealized Losses (13,214) (14,395)
Estimated Fair Value 732,692 728,041
Trust preferred securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,564 11,576
Gross Unrealized Gains 0 0
Gross Unrealized Losses (251) (449)
Estimated Fair Value 4,313 11,127
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 97,689 88,018
Gross Unrealized Gains 609 358
Gross Unrealized Losses (1,044) (1,537)
Estimated Fair Value 97,254 86,839
Total Debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,592,909 1,568,884
Gross Unrealized Gains 2,267 1,842
Gross Unrealized Losses (24,300) (27,044)
Estimated Fair Value 1,570,876 1,543,682
Mutual funds - GSE mortgage related securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,425 13,425
Gross Unrealized Gains 18 0
Gross Unrealized Losses (373) (367)
Estimated Fair Value $ 13,070 $ 13,058