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Allowance for Loan Losses - Activity in Allowance for Losses Disaggregated on Basis of Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 187
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	362
Allowance for Loan and Lease Losses, Write-offs	(187)	$ (1,597)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	362	1,180
Provision for credit losses	(6,135)	9,964
Allowance for credit losses on loans	64,225	47,540	$ 70,185		$ 36,171
Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans			0		1,822
Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans			70,185		37,993
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					1,822
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	1
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	207
Allowance for Loan and Lease Losses, Write-offs		(1,222)
Allowance for Loan and Lease Loss, Recovery of Bad Debts		1,069
Provision for credit losses	(4,610)	7,021
Allowance for credit losses on loans	45,204	27,866	49,608		23,933
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				$ 20,998
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				(2,935)
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	1	1,087
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	205	1,057
Provision for credit losses	(8,444)	3,539
Allowance for credit losses on loans	21,770	13,900	30,010		11,739
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				10,391
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				(1,348)
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	135
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	2	12
Provision for credit losses	976	1,375
Allowance for credit losses on loans	10,464	6,216	9,486		4,512
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				4,964
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				452
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Provision for credit losses	2,858	2,107
Allowance for credit losses on loans	12,970	7,750	10,112		7,682
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				5,643
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				(2,039)
Commercial Portfolio Segment [Member] | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Provision for credit losses	0	0
Allowance for credit losses on loans	0	0	0		0
Commercial Portfolio Segment [Member] | Paycheck Protection Program | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				0
Commercial Portfolio Segment [Member] | Paycheck Protection Program | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				0
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	0	3
Provision for credit losses	(189)	94
Allowance for credit losses on loans	1,402	3,026	1,591		1,458
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				2,929
Residential Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans				$ 1,471
Real Estate Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	1
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	16
Allowance for Loan and Lease Losses, Write-offs		0
Allowance for Loan and Lease Loss, Recovery of Bad Debts		14
Provision for credit losses	164	2,565
Allowance for credit losses on loans	13,271	12,308	13,092		3,060
Real Estate Construction and Land Development | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					9,729
Real Estate Construction and Land Development | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					6,669
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	16	14
Provision for credit losses	81	(34)
Allowance for credit losses on loans	2,048	864	1,951		1,455
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					884
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					(571)
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	1	0
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Provision for credit losses	83	2,599
Allowance for credit losses on loans	11,223	11,444	11,141		1,605
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					8,845
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					7,240
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	185	375
Schedule of allowance for loan losses on the basis of impairment method
Financing Receivable, Allowance for Credit Loss, Recovery	139	94
Provision for credit losses	(1,500)	284
Allowance for credit losses on loans	$ 4,348	4,340	$ 5,894		6,821
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					4,337
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					(2,484)
Unallocated
Schedule of allowance for loan losses on the basis of impairment method
Allowance for Loan and Lease Losses, Write-offs		0
Allowance for Loan and Lease Loss, Recovery of Bad Debts		0
Provision for credit losses		0
Allowance for credit losses on loans		$ 0			899
Unallocated | Cumulative Effect, Period of Adoption, Adjusted Balance
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					0
Unallocated | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Schedule of allowance for loan losses on the basis of impairment method
Allowance for credit losses on loans					$ (899)

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of expense related to estimated loss from loan and lease transactions.

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