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Subsequent Event (Details Textual) - USD ($) | Jan. 16, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Subsequent Event [Line Items] |  |  |
Total assets |  | $ 12,115,484,000 | $ 9,706,349,000
Gross loans |  | $ 8,287,549,000 | $ 6,577,824,000
Acquisition of The First National Bank of Layton |  |  |
Subsequent Event [Line Items] |  |  |
Subsequent Event, Description | the Company announced the signing of a definitive agreement to acquire FNB Bancorp and its wholly-owned subsidiary, The First National Bank of Layton, a community bank based in Layton, Utah |  |
Total assets | $ 334,709,000 |  |
Gross loans | 246,724,000 |  |
Total deposits | $ 285,752,000 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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