Securities Available for Sale (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
Schedule of Available-for-sale Securities [Line Items]
Unrealized gains (losses) on securities available for sale and interest only strips	$ 6,603	$ (8,446)	$ 22,194	$ (3,191)
Amortized Cost	1,081,209		1,081,209		$ 1,014,060
Gross Unrealized Gains	19,948		19,948		5,248
Gross Unrealized Losses	(1,213)		(1,213)		(8,752)
Estimated Fair Value	1,099,944		1,099,944		1,010,556
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	$ 0	0	$ 424
GSE collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	524,406		524,406		454,096
Gross Unrealized Gains	7,259		7,259		839
Gross Unrealized Losses	(185)		(185)		(4,955)
Estimated Fair Value	531,480		531,480		449,980
GSE mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	494,930		494,930		497,889
Gross Unrealized Gains	10,266		10,266		3,003
Gross Unrealized Losses	(186)		(186)		(2,845)
Estimated Fair Value	505,010		505,010		498,047
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,553		4,553		4,545
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	(840)		(840)		(796)
Estimated Fair Value	3,713		3,713		3,749
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	43,895		43,895		44,105
Gross Unrealized Gains	2,307		2,307		1,406
Gross Unrealized Losses	(2)		(2)		0
Estimated Fair Value	46,200		46,200		45,511
Total Debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,067,784		1,067,784		1,000,635
Gross Unrealized Gains	19,832		19,832		5,248
Gross Unrealized Losses	(1,213)		(1,213)		(8,596)
Estimated Fair Value	1,086,403		1,086,403		997,287
Mutual funds - GSE mortgage related securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,425		13,425		13,425
Gross Unrealized Gains	116		116		0
Gross Unrealized Losses	0		0		(156)
Estimated Fair Value	$ 13,541		$ 13,541		$ 13,269

Unrealized gain (loss) on securities available for sale and interest only strips.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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