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Investment Securities Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Security	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Investments [Line Items]
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings	$ 0	$ 0
Number of Held to Maturity investments in unrealized loss position | Security	0
Amortized cost	$ 2,168,885,000
Available-for-sale Securities, Fair Value Disclosure	2,159,806,000		$ 2,080,294,000
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	11,500,000	$ 11,500,000
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	447,924,000
Available-for-sale Securities, Fair Value Disclosure	440,858,000
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	293,116,000
Available-for-sale Securities, Fair Value Disclosure	297,684,000
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 896,600,000		$ 973,400,000

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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