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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 USD ($) security | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security |  | 186 |  | 222
Number of Securities, 12 months or longer | security |  | 6 |  | 5
Number of Securities, Total | security |  | 192 |  | 227
Fair Value |  |  |  |
Fair Value - Less than 12 months |  | $ 1,302,740,000 |  | $ 1,328,003,000
Fair Value - 12 months or longer |  | 39,665,000 |  | 40,446,000
Fair Value - Total |  | 1,342,405,000 |  | 1,368,449,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months |  | (23,277,000) |  | (25,760,000)
Gross Unrealized Losses - 12 months or longer |  | (1,396,000) |  | (1,651,000)
Gross Unrealized Losses - Total |  | (24,673,000) |  | $ (27,411,000)
Change in unrealized net holding gains on securities available for sale |  | $ 3,181,000 | $ 15,633,000 |
US Government Agencies Debt Securities [Member] |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security | [1] | 3 |  |
Number of Securities, 12 months or longer | security | [1] | 0 |  |
Number of Securities, Total | security | [1] | 3 |  |
Fair Value |  |  |  |
Fair Value - Less than 12 months | [1] | $ 9,998,000 |  |
Fair Value - 12 months or longer | [1] | 0 |  |
Fair Value - Total | [1] | 9,998,000 |  |
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months | [1] | (4,000) |  |
Gross Unrealized Losses - 12 months or longer | [1] | 0 |  |
Gross Unrealized Losses - Total | [1] | $ (4,000) |  |
GSE collateralized mortgage obligations |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security | [1] | 67 |  | 66
Number of Securities, 12 months or longer | security | [1] | 4 |  | 4
Number of Securities, Total | security | [1] | 71 |  | 70
Fair Value |  |  |  |
Fair Value - Less than 12 months | [1] | $ 624,327,000 |  | $ 615,803,000
Fair Value - 12 months or longer | [1] | 34,843,000 |  | 36,333,000
Fair Value - Total | [1] | 659,170,000 |  | 652,136,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months | [1] | (8,668,000) |  | (9,459,000)
Gross Unrealized Losses - 12 months or longer | [1] | (1,119,000) |  | (1,204,000)
Gross Unrealized Losses - Total | [1] | (9,787,000) |  | $ (10,663,000)
OTTI recognized |  | $ 0 |  |
GSE mortgage-backed securities |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security | [1] | 59 |  | 57
Number of Securities, 12 months or longer | security | [1] | 0 |  | 0
Number of Securities, Total | security | [1] | 59 |  | 57
Fair Value |  |  |  |
Fair Value - Less than 12 months | [1] | $ 606,378,000 |  | $ 622,797,000
Fair Value - 12 months or longer | [1] | 0 |  | 0
Fair Value - Total | [1] | 606,378,000 |  | 622,797,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months | [1] | (13,214,000) |  | (14,395,000)
Gross Unrealized Losses - 12 months or longer | [1] | 0 |  | 0
Gross Unrealized Losses - Total | [1] | (13,214,000) |  | $ (14,395,000)
OTTI recognized |  | $ 0 |  |
Trust preferred securities |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security |  | 0 |  | 1
Number of Securities, 12 months or longer | security |  | 1 |  | 1
Number of Securities, Total | security |  | 1 |  | 2
Fair Value |  |  |  |
Fair Value - Less than 12 months |  | $ 0 |  | $ 7,014,000
Fair Value - 12 months or longer |  | 4,313,000 |  | 4,113,000
Fair Value - Total |  | 4,313,000 |  | 11,127,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months |  | 0 |  | (2,000)
Gross Unrealized Losses - 12 months or longer |  | (251,000) |  | (447,000)
Gross Unrealized Losses - Total |  | (251,000) |  | $ (449,000)
OTTI recognized |  | $ 0 |  |
Municipal bonds |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security |  | 54 |  | 95
Number of Securities, 12 months or longer | security |  | 1 |  | 0
Number of Securities, Total | security |  | 55 |  | 95
Fair Value |  |  |  |
Fair Value - Less than 12 months |  | $ 50,447,000 |  | $ 69,331,000
Fair Value - 12 months or longer |  | 509,000 |  | 0
Fair Value - Total |  | 50,956,000 |  | 69,331,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months |  | (1,018,000) |  | (1,537,000)
Gross Unrealized Losses - 12 months or longer |  | (26,000) |  | 0
Gross Unrealized Losses - Total |  | $ (1,044,000) |  | $ (1,537,000)
Mutual funds - GSE mortgage related securities |  |  |  |
Number of Securities |  |  |  |
Number of Securities, Less than 12 months | security |  | 3 |  | 3
Number of Securities, 12 months or longer | security |  | 0 |  | 0
Number of Securities, Total | security |  | 3 |  | 3
Fair Value |  |  |  |
Fair Value - Less than 12 months |  | $ 11,590,000 |  | $ 13,058,000
Fair Value - 12 months or longer |  | 0 |  | 0
Fair Value - Total |  | 11,590,000 |  | 13,058,000
Gross Unrealized Losses |  |  |  |
Gross Unrealized Losses - Less than 12 months |  | (373,000) |  | (367,000)
Gross Unrealized Losses - 12 months or longer |  | 0 |  | 0
Gross Unrealized Losses - Total |  | $ (373,000) |  | $ (367,000)
Credit concentration risk | Stockholders' equity | Non-US Government and agency securities |  |  |  |
Gross Unrealized Losses |  |  |  |
Maximum exposure to any single issuer |  | 10.00% |  | 10.00%
[1] | Investments in U.S. Government agency and U.S. Government sponsored enterprises

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