Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 186,057	$ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	213	9,553
Available for Sale, Losses 12 months or longer, Fair Value	103,507	150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	1,000	3,908
Available for Sale, Total, Fair Value	289,564	1,198,688
Available for Sale, Total, Gross Unrealized Losses	$ 1,213	13,461
US Treasury and Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value
Available for Sale, Losses less than 12 months, Gross Unrealized Losses
Available for Sale, Losses 12 months or longer, Fair Value	$ 76	82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses		1
Available for Sale, Total, Fair Value	$ 76	82
Available for Sale, Total, Gross Unrealized Losses		1
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	$ 25,999	8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	43	38
Available for Sale, Total, Fair Value	25,999	8,296
Available for Sale, Total, Gross Unrealized Losses	43	38
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value	160,058	831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses	170	8,257
Available for Sale, Losses 12 months or longer, Fair Value	69,703	116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	554	2,925
Available for Sale, Total, Fair Value	229,761	947,282
Available for Sale, Total, Gross Unrealized Losses	724	11,182
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Losses less than 12 months, Fair Value		208,397
Available for Sale, Losses less than 12 months, Gross Unrealized Losses		1,257
Available for Sale, Losses 12 months or longer, Fair Value	32,215	33,138
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	419	935
Available for Sale, Total, Fair Value	32,215	241,535
Available for Sale, Total, Gross Unrealized Losses	419	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	1,513	1,473
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses	27	47
Available for Sale, Total, Fair Value	1,513	1,493
Available for Sale, Total, Gross Unrealized Losses	$ 27	$ 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=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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