Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 1,857,312	$ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	56,218	9,553
Available for Sale, Losses 12 months or longer, Fair Value	3,738	150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	69	3,908
Available for Sale, Total, Fair Value	1,861,050	1,198,688
Available for Sale, Total, Gross Unrealized Losses	56,287	13,461
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	54,788
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	1,923
Available for Sale, Losses 12 months or longer, Fair Value		82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		1
Available for Sale, Total, Fair Value	54,788	82
Available for Sale, Total, Gross Unrealized Losses	1,923	1
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	228,588	8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	11,186	38
Available for Sale, Total, Fair Value	228,588	8,296
Available for Sale, Total, Gross Unrealized Losses	11,186	38
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	1,087,644	831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	19,359	8,257
Available for Sale, Losses 12 months or longer, Fair Value	3,738	116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	69	2,925
Available for Sale, Total, Fair Value	1,091,382	947,282
Available for Sale, Total, Gross Unrealized Losses	19,428	11,182
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	402,591
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	23,159
Available for Sale, Total, Fair Value	402,591
Available for Sale, Total, Gross Unrealized Losses	23,159
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	83,701	208,397
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	591	1,257
Available for Sale, Losses 12 months or longer, Fair Value		33,138
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		935
Available for Sale, Total, Fair Value	83,701	241,535
Available for Sale, Total, Gross Unrealized Losses	$ 591	2,192
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value		20
Available for Sale, Losses less than 12 months, Gross Unrealized Losses		1
Available for Sale, Losses 12 months or longer, Fair Value		1,473
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		47
Available for Sale, Total, Fair Value		1,493
Available for Sale, Total, Gross Unrealized Losses		$ 48

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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