Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,261,278	$ 2,086,745
Securities Available for Sale, Gross Unrealized Gains	47,664	20,120
Securities Available for Sale, Gross Unrealized Losses	130	13,461
Securities Available for Sale, Fair Value	2,308,812	2,093,404
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	116	135
Securities Available for Sale, Gross Unrealized Losses		1
Securities Available for Sale, Fair Value	116	134
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	151,557	39,410
Securities Available for Sale, Gross Unrealized Gains	4,735	235
Securities Available for Sale, Gross Unrealized Losses		38
Securities Available for Sale, Fair Value	156,292	39,607
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,867,063	1,750,168
Securities Available for Sale, Gross Unrealized Gains	39,413	19,387
Securities Available for Sale, Gross Unrealized Losses	130	11,182
Securities Available for Sale, Fair Value	1,906,346	1,758,373
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	238,165	291,085
Securities Available for Sale, Gross Unrealized Gains	3,181	140
Securities Available for Sale, Gross Unrealized Losses		2,192
Securities Available for Sale, Fair Value	241,346	289,033
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	3,500	3,500
Securities Available for Sale, Fair Value	3,500	3,500
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Amortized Cost	877	2,447
Securities Available for Sale, Gross Unrealized Gains	335	358
Securities Available for Sale, Gross Unrealized Losses		48
Securities Available for Sale, Fair Value	$ 1,212	$ 2,757

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

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
-Subparagraph (aa)
-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
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-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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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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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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