Description of interest percentage on the preferred securities.

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Period for interest deferral on trust preferred securities.

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Description of variable interest percentage for the preferred securities. (e.g. Libor plus variable interest rate)

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Subordinated borrowing, fixed interest rate, period.

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Market value of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of income earned, after hedging basis adjustments, from fees charged for prepayment of certain Federal Home Loan Bank (FHLBank) advances before original maturity.

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

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The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures.

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Describe the nature and terms of the financial instrument, and the rights and obligations embodied in the instrument. Include settlement alternatives, if any, in the contract and identify the entity that controls the settlement alternatives.

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Date the payments are due on subordinated debt, in CCYY-MM-DD format.

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Stated interest rate of the subordinated debt.

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Borrowings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Fixed rate advances paid off	$ 35,000
Proceeds from Issuance of Subordinated Long-term Debt		$ 48,735
Period for Interest Deferral on Trust Preferred Securities		5 years
Securities sold under repurchase agreements			$ 2,999
Maturity Overnight [Member]
Debt Instrument [Line Items]
Securities sold under repurchase agreements	$ 0	$ 0	3,000
Maturity Overnight [Member] \| Collateralized mortgage obligations [Member]
Debt Instrument [Line Items]
Investment securities under repurchase agreement, market value			$ 5,800
Premier Statutory Trust II [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Subordinated Long-term Debt		15,500
Proceeds from Issuance of Trust Preferred Securities		$ 15,000
Coupon Rate on Preferred Securities, Period End	1.75%	1.75%	3.39%
Preferred Securities Variable Interest Rate		LIBOR rate plus 1.5%
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description		The Trust Preferred Securities and Subordinated Debentures mature on September 15, 2037, but can be redeemed at the Company’s option at any time now.
Premier Statutory Trust I [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Subordinated Long-term Debt		$ 20,600
Proceeds from Issuance of Trust Preferred Securities		$ 20,000
Coupon Rate on Preferred Securities, Period End	1.63%	1.63%	3.27%
Preferred Securities Variable Interest Rate		LIBOR rate plus 1.38%
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description		The Trust Preferred Securities and Subordinated Debentures mature on December 15, 2035, but can be redeemed at the Company’s option at any time now.
Subordinated Debt [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 50,000	$ 50,000
Subordinated notes, due date		Sep. 30, 2030
Subordinated notes, fixed Interest rate		4.00%
Subordinated notes, fixed interest rate, period		5 years
Basis spread on variable rate		3.885%
Proceeds from Issuance of Subordinated Long-term Debt		$ 48,700
Other Non Interest Expense [Member]
Debt Instrument [Line Items]
Prepayment penalty	$ 1,400