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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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