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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Investments in pooled trust preferred securities
Amortized Cost	$ 1,141,627	$ 686,405
Securities available for sale	1,150,459	674,248
Trust preferred securities
Investments in pooled trust preferred securities
Amortized Cost	12,454	23,749
Securities available for sale	8,960	$ 18,389
Unrealized Loss	(3,494)
XXIII
Investments in pooled trust preferred securities
Amortized Cost	8,302
Securities available for sale	5,813
Unrealized Loss	$ (2,489)
Issuers Currently in Deferral or Default (percent)	15.00%
XXVI
Investments in pooled trust preferred securities
Amortized Cost	$ 4,152
Securities available for sale	3,147
Unrealized Loss	$ (1,005)
Issuers Currently in Deferral or Default (percent)	19.00%

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Percentage of issuers currently in deferral or default.

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562

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

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+ 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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