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Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Assets: |  |
Securities available for sale, at fair value | $ 1,583,946,000 | $ 1,556,740,000
Reclassification adjustments for gains realized in income | 0 |
Collateralized Debt Obligations [Member] |  |
Assets: |  |
Securities available for sale, at fair value | 9,998,000 | 12,008,000
GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 726,619,000 | 705,667,000
GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 732,692,000 | 728,041,000
Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 4,313,000 | 11,127,000
Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 97,254,000 | 86,839,000
Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 13,070,000 | 13,058,000
Recurring basis | Collateralized Debt Obligations [Member] |  |
Assets: |  |
Securities available for sale, at fair value | 9,998,000 | 12,008,000
Recurring basis | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 726,619,000 | 705,667,000
Recurring basis | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 732,692,000 | 728,041,000
Recurring basis | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 4,313,000 | 11,127,000
Recurring basis | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 97,254,000 | 86,839,000
Recurring basis | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 13,070,000 | 13,058,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Derivative Asset | 0 | 0
Mortgage Banking Derivative Assets, at Fair Value | 0 | 0
Mortgage Banking Derivative Liabilities, at Fair Value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Debt Obligations [Member] |  |
Assets: |  |
Securities available for sale, at fair value | 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 | 13,070,000 | 13,058,000
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivative Asset | (1,623,000) | (1,565,000)
Mortgage Banking Derivative Assets, at Fair Value | 113,000 | 147,000
Mortgage Banking Derivative Liabilities, at Fair Value | 40,000 | 41,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Collateralized Debt Obligations [Member] |  |
Assets: |  |
Securities available for sale, at fair value | 9,998,000 | 12,008,000
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE collateralized mortgage obligations |  |
Assets: |  |
Securities available for sale, at fair value | 726,619,000 | 705,667,000
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE mortgage-backed securities |  |
Assets: |  |
Securities available for sale, at fair value | 732,692,000 | 728,041,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities |  |
Assets: |  |
Securities available for sale, at fair value | 4,313,000 | 11,127,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |
Assets: |  |
Securities available for sale, at fair value | 96,126,000 | 85,700,000
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
Mortgage Banking Derivative Assets, at Fair Value | 0 | 0
Mortgage Banking Derivative Liabilities, at Fair Value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Collateralized Debt Obligations [Member] |  |
Assets: |  |
Securities available for sale, at fair value | 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 | 1,128,000 | 1,139,000
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 | (1,623,000) | (1,565,000)
Mortgage Banking Derivative Assets, at Fair Value | 113,000 | 147,000
Mortgage Banking Derivative Liabilities, at Fair Value | $ 40,000 | $ 41,000

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