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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

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Subsequent Events (Details) - USD ($)	Apr. 30, 2019	Apr. 03, 2019	Mar. 31, 2019	Dec. 31, 2018
Subsequent Event
Total assets			$ 12,073,779,000	$ 12,115,484,000
Gross loans			$ 8,326,070,000	$ 8,287,549,000
Subsequent Event
Subsequent Event
Subsequent Event, Description	On April 30, 2019, the Company acquired the outstanding common stock of FNB Bancorp and its wholly-owned subsidiary, The First National Bank of Layton, a community bank based in Layton, Utah.	On April 3, 2019, the Company announced the signing of a definitive agreement to acquire Heritage Bancorp and its wholly-owned subsidiary, Heritage Bank of Nevada, a community bank based in Reno, Nevada (collectively, “Heritage”).
Total assets		$ 840,769,000
Gross loans		589,458,000
Total deposits		$ 722,955,000