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Securities Available for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Unrealized gains on securities available for sale and interest only strips | $ 15,592 | $ 5,255 |
Amortized Cost | 1,075,767 |  | $ 1,014,060
Gross Unrealized Gains | 14,583 |  | 5,248
Gross Unrealized Losses | (2,453) |  | (8,752)
Estimated Fair Value | 1,087,897 |  | 1,010,556
GSE collateralized mortgage obligations |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 493,539 |  | 454,096
Gross Unrealized Gains | 5,189 |  | 839
Gross Unrealized Losses | (702) |  | (4,955)
Estimated Fair Value | 498,026 |  | 449,980
GSE mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 520,254 |  | 497,889
Gross Unrealized Gains | 7,245 |  | 3,003
Gross Unrealized Losses | (589) |  | (2,845)
Estimated Fair Value | 526,910 |  | 498,047
Trust preferred securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,549 |  | 4,545
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (1,155) |  | (796)
Estimated Fair Value | 3,394 |  | 3,749
Municipal bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 44,000 |  | 44,105
Gross Unrealized Gains | 2,120 |  | 1,406
Gross Unrealized Losses | (7) |  | 0
Estimated Fair Value | 46,113 |  | 45,511
Total Debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,062,342 |  | 1,000,635
Gross Unrealized Gains | 14,554 |  | 5,248
Gross Unrealized Losses | (2,453) |  | (8,596)
Estimated Fair Value | 1,074,443 |  | 997,287
Mutual funds - GSE mortgage related securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 13,425 |  | 13,425
Gross Unrealized Gains | 29 |  | 0
Gross Unrealized Losses | 0 |  | (156)
Estimated Fair Value | $ 13,454 |  | $ 13,269

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- Definition Unrealized gain (loss) on securities available for sale and interest only strips. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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