BASIS OF PRESENTATION (Policies)	3 Months Ended
Mar. 31, 2019
BASIS OF PRESENTATION [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This standard requires organizations that are lessees to recognize a lease liability, which is the lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified property for the lease term. The new guidance also requires lessees to disclose key information about leasing requirements for leases that were historically classified as operating leases under previous generally accepted accounting principles. This ASU became effective for Premier for interim and annual periods beginning after December 15, 2018. The Company leases some of its branch locations. The Company adopted Topic 842 on January 1, 2019. The Company applied a modified retrospective transition approach for the applicable leases. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company has also elected to use the practical expedient to make an accounting policy election for property leases to include both lease and non-lease components as a single component and account for it as a lease. Upon adoption of this standard, the Company recorded a $7.6 million right of use asset, included in premises and equipment, determined by calculating an estimated present value of future lease payments over the extended lives of the Company’s leases. The Company also recorded a $7.6 million finance lease liability, included in other liabilities. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU replaces the measurement for credit losses from a probable incurred estimate with an expected future loss estimate, which is referred to as the “current expected credit loss” or “CECL”. The standard pertains to financial assets measured at amortized cost such as loans, debt securities classified as held-to-maturity, and certain other contracts, in which organizations will now use forward-looking information to enhance their credit loss estimates on these assets. The largest impact will be on the allowance for loan and lease losses. This ASU will become effective for the Company for interim and annual periods beginning after December 15, 2019. Although early adoption is permitted the Company did not elect early adoption. The company has formed a committee to oversee the steps required in the adoption of the new current expected credit loss method. The committee has selected a third-party vendor to assist in data analysis and modeling as well as the required disclosures. Management is currently evaluating the impact of the adoption of this guidance on the Company’s financial statements. Upon adoption, an initial cumulative increase in the allowance for loan losses is currently anticipated by management along with a corresponding decrease in capital as permitted by the standard. However, due to the complexity of the calculation and evolving guidance on adoption management has not yet determined the one-time adjustment.

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This standard requires organizations that are lessees to recognize a lease liability, which is the lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified property for the lease term. The new guidance also requires lessees to disclose key information about leasing requirements for leases that were historically classified as operating leases under previous generally accepted accounting principles. This ASU became effective for Premier for interim and annual periods beginning after December 15, 2018. The Company leases some of its branch locations. The Company adopted Topic 842 on January 1, 2019. The Company applied a modified retrospective transition approach for the applicable leases. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company has also elected to use the practical expedient to make an accounting policy election for property leases to include both lease and non-lease components as a single component and account for it as a lease. Upon adoption of this standard, the Company recorded a $7.6 million right of use asset, included in premises and equipment, determined by calculating an estimated present value of future lease payments over the extended lives of the Company’s leases. The Company also recorded a $7.6 million finance lease liability, included in other liabilities.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU replaces the measurement for credit losses from a probable incurred estimate with an expected future loss estimate, which is referred to as the “current expected credit loss” or “CECL”. The standard pertains to financial assets measured at amortized cost such as loans, debt securities classified as held-to-maturity, and certain other contracts, in which organizations will now use forward-looking information to enhance their credit loss estimates on these assets. The largest impact will be on the allowance for loan and lease losses. This ASU will become effective for the Company for interim and annual periods beginning after December 15, 2019. Although early adoption is permitted the Company did not elect early adoption. The company has formed a committee to oversee the steps required in the adoption of the new current expected credit loss method. The committee has selected a third-party vendor to assist in data analysis and modeling as well as the required disclosures. Management is currently evaluating the impact of the adoption of this guidance on the Company’s financial statements. Upon adoption, an initial cumulative increase in the allowance for loan losses is currently anticipated by management along with a corresponding decrease in capital as permitted by the standard. However, due to the complexity of the calculation and evolving guidance on adoption management has not yet determined the one-time adjustment.