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

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

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings.

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Investment Securities Narrative (Details) - USD ($)	3 Months Ended
Investment Securities Narrative (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings	$ 0
Amortized cost		$ 2,735,991,000
Available-for-sale Securities, Fair Value Disclosure		2,790,834,000	$ 2,497,537,000
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
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		214,259,000
Available-for-sale Securities, Fair Value Disclosure		220,629,000
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		825,863,000
Available-for-sale Securities, Fair Value Disclosure		848,084,000
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Securities pledged as collateral		$ 497,800,000	$ 462,600,000