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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 1,213,510	$ 1,513,235
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	10,258	34,152
Held to maturity, Losses 12 months or longer, Fair Value	331,673	127,125
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	9,917	3,847
Held to maturity, Total, Fair Value	1,545,183	1,640,360
Held to maturity, Total, Gross Unrealized Losses	20,175	37,999
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	49,938	49,956
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	63	44
Held to maturity, Total, Fair Value	49,938	49,956
Held to maturity, Total, Gross Unrealized Losses	63	44
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	275,874	494,470
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,975	19,706
Held to maturity, Losses 12 months or longer, Fair Value	98,976	11,750
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	4,421	469
Held to maturity, Total, Fair Value	374,850	506,220
Held to maturity, Total, Gross Unrealized Losses	7,396	20,175
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	254,743	278,369
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	776	3,068
Held to maturity, Total, Fair Value	254,743	278,369
Held to maturity, Total, Gross Unrealized Losses	776	3,068
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	73,096	71,701
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,592	4,038
Held to maturity, Total, Fair Value	73,096	71,701
Held to maturity, Total, Gross Unrealized Losses	2,592	4,038
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	559,859	618,739
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	3,852	7,296
Held to maturity, Losses 12 months or longer, Fair Value	232,697	115,375
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	5,496	3,378
Held to maturity, Total, Fair Value	792,556	734,114
Held to maturity, Total, Gross Unrealized Losses	$ 9,348	$ 10,674

X

- Definition

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

+ 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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