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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

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