Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Unrealized gains on securities available for sale and interest only strips	$ 15,592	$ 5,255
Amortized Cost	1,075,767		$ 1,014,060
Gross Unrealized Gains	14,583		5,248
Gross Unrealized Losses	(2,453)		(8,752)
Estimated Fair Value	1,087,897		1,010,556
GSE collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	493,539		454,096
Gross Unrealized Gains	5,189		839
Gross Unrealized Losses	(702)		(4,955)
Estimated Fair Value	498,026		449,980
GSE mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	520,254		497,889
Gross Unrealized Gains	7,245		3,003
Gross Unrealized Losses	(589)		(2,845)
Estimated Fair Value	526,910		498,047
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,549		4,545
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,155)		(796)
Estimated Fair Value	3,394		3,749
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,000		44,105
Gross Unrealized Gains	2,120		1,406
Gross Unrealized Losses	(7)		0
Estimated Fair Value	46,113		45,511
Total Debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,062,342		1,000,635
Gross Unrealized Gains	14,554		5,248
Gross Unrealized Losses	(2,453)		(8,596)
Estimated Fair Value	1,074,443		997,287
Mutual funds - GSE mortgage related securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,425		13,425
Gross Unrealized Gains	29		0
Gross Unrealized Losses	0		(156)
Estimated Fair Value	$ 13,454		$ 13,269

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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

No definition available.

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