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Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Securities available for sale, at fair value | $ 1,087,897 | $ 1,010,556
GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 498,026 | 449,980
GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 526,910 | 498,047
Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,394 | 3,749
Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 46,113 | 45,511
Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 13,454 | 13,269
Recurring basis | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 498,026 | 449,980
Recurring basis | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 526,910 | 498,047
Recurring basis | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,394 | 3,749
Recurring basis | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 46,113 | 45,511
Recurring basis | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 13,454 | 13,269
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivative Asset | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 13,454 | 13,269
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivative Asset | 6,260 | 2,680
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 498,026 | 449,980
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 526,910 | 498,047
Recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,394 | 3,749
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 44,904 | 44,345
Recurring basis | Significant Other Observable Inputs (Level 2) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivative Asset | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 1,209 | 1,166
Recurring basis | Significant Unobservable Inputs (Level 3) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring basis |  |
Assets: |  |
Derivative Asset | $ 6,260 | $ 2,680

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