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Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ 0	$ 0	$ 0	$ 424
Assets:
Securities available for sale, at fair value	1,099,944		1,099,944		$ 1,010,556
GSE collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	531,480		531,480		449,980
GSE mortgage-backed securities
Assets:
Securities available for sale, at fair value	505,010		505,010		498,047
Trust preferred securities
Assets:
Securities available for sale, at fair value	3,713		3,713		3,749
Municipal bonds
Assets:
Securities available for sale, at fair value	46,200		46,200		45,511
Mutual funds
Assets:
Securities available for sale, at fair value	13,541		13,541		13,269
Recurring basis | GSE collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	531,480		531,480		449,980
Recurring basis | GSE mortgage-backed securities
Assets:
Securities available for sale, at fair value	505,010		505,010		498,047
Recurring basis | Trust preferred securities
Assets:
Securities available for sale, at fair value	3,713		3,713		3,749
Recurring basis | Municipal bonds
Assets:
Securities available for sale, at fair value	46,200		46,200		45,511
Recurring basis | Mutual funds
Assets:
Securities available for sale, at fair value	13,541		13,541		13,269
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative Asset	0		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		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		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		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		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Assets:
Securities available for sale, at fair value	13,541		13,541		13,269
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Derivative Asset	9,092		9,092		2,680
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	531,480		531,480		449,980
Recurring basis | Significant Other Observable Inputs (Level 2) | GSE mortgage-backed securities
Assets:
Securities available for sale, at fair value	505,010		505,010		498,047
Recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities
Assets:
Securities available for sale, at fair value	3,713		3,713		3,749
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds
Assets:
Securities available for sale, at fair value	44,966		44,966		44,345
Recurring basis | Significant Other Observable Inputs (Level 2) | Mutual funds
Assets:
Securities available for sale, at fair value	0		0		0
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Derivative Asset	0		0		0
Recurring basis | Significant Unobservable Inputs (Level 3) | GSE collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	0		0		0
Recurring basis | Significant Unobservable Inputs (Level 3) | GSE mortgage-backed securities
Assets:
Securities available for sale, at fair value	0		0		0
Recurring basis | Significant Unobservable Inputs (Level 3) | Trust preferred securities
Assets:
Securities available for sale, at fair value	0		0		0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal bonds
Assets:
Securities available for sale, at fair value	1,234		1,234		1,166
Recurring basis | Significant Unobservable Inputs (Level 3) | Mutual funds
Assets:
Securities available for sale, at fair value	0		0		0
Estimate of Fair Value Measurement [Member] | Recurring basis
Assets:
Derivative Asset	$ 9,092		$ 9,092		$ 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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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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