Derivative Financial Instruments (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) derivative	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense	$ 15,714,000	$ 47,577,000
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(66,000)	$ 0
Not Designated as Hedging Instrument \| Interest rate swaps \| Correspondent Banks \| Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 406,551,000		$ 503,929,000
Weighted average remaining term (years)	6 years		6 years 9 months 18 days
Received/Pay variable rate (weighted average)	2.24%		2.26%
Pay/Received fixed rate (weighted average)	4.10%		3.86%
Estimated fair value	$ (17,878,000)		$ (34,606,000)
Not Designated as Hedging Instrument \| Interest rate swaps \| Correspondent Banks \| Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,711,000		$ 0
Weighted average remaining term (years)	9 years 1 month 6 days		0 years
Received/Pay variable rate (weighted average)	2.12%		0.00%
Pay/Received fixed rate (weighted average)	2.90%		0.00%
Estimated fair value	$ 4,008,000		$ 0
Not Designated as Hedging Instrument \| Interest rate swaps \| Customers \| Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,711,000		$ 0
Weighted average remaining term (years)	9 years 1 month 6 days		0 years
Received/Pay variable rate (weighted average)	2.12%		0.00%
Pay/Received fixed rate (weighted average)	2.90%		0.00%
Estimated fair value	$ (4,008,000)		$ 0
Not Designated as Hedging Instrument \| Interest rate swaps \| Customers \| Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 406,551,000		$ 503,929,000
Weighted average remaining term (years)	6 years		6 years 9 months 18 days
Received/Pay variable rate (weighted average)	2.24%		2.26%
Pay/Received fixed rate (weighted average)	4.10%		3.86%
Estimated fair value	$ 17,878,000		$ 34,606,000
Not Designated as Hedging Instrument \| Risk participation agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	111,800,000		112,800,000
Credit valuation adjustment	95,000		398,000
Designated as Hedging Instrument \| Interest rate swaps \| Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 0		$ 100,000,000
Weighted average remaining term (years)	0 years		4 years 3 months 18 days
Received/Pay variable rate (weighted average)	0.00%		0.22%
Pay/Received fixed rate (weighted average)	0.00%		0.49%
Estimated fair value	$ 0		$ (602,000)
Designated as Hedging Instrument \| Interest rate swaps \| Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000,000		$ 0
Weighted average remaining term (years)	4 years		0 years
Received/Pay variable rate (weighted average)	0.22%		0.00%
Pay/Received fixed rate (weighted average)	0.49%		0.00%
Estimated fair value	$ 1,218,000		$ 0
Designated as Hedging Instrument \| Cash Flow Hedge \| Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000,000.0
Number of derivative instruments held \| derivative	1

Average fixed interest rate related to the group of interest rate derivatives.

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Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Average variable interest rate related to the group of interest rate derivatives.

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Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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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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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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