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Loans Receivable - Components of Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable	$ 4,468,647	$ 3,767,879
Loans receivable, net	4,468,647	3,767,879
Allowance for credit losses on loans	70,185	36,171	$ 37,993
Loans receivable, net	4,398,462	3,731,708
Financing Receivable, Unamortized Purchase Premium (Discount)	6,575	8,371
Financing Receivable, Unamortized Loan Fee (Cost) and Purchase Premium (Discount)	$ (15,458)	$ 2,441
Real estate construction and land development | Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	88.20%	82.70%
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 0
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable	3,715,206	$ 2,946,233
Loans receivable, net	3,715,206	2,946,233
Allowance for credit losses on loans			20,998
Commercial business | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		852,220
Loans receivable, net	733,098	852,220
Allowance for credit losses on loans			10,391
Commercial business | Owner-occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		805,234
Loans receivable, net	856,684	805,234
Allowance for credit losses on loans			4,964
Commercial business | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		1,288,779
Loans receivable, net	1,410,303	1,288,779
Allowance for credit losses on loans			5,643
Commercial business | Paycheck Protection Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net	715,121	0
Allowance for credit losses on loans			0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		131,660
Loans receivable, net	122,756	131,660
Allowance for credit losses on loans			2,929
Real estate construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable	305,713	274,646
Loans receivable, net	305,713	274,646
Allowance for credit losses on loans			9,729
Real estate construction and land development | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		104,296
Loans receivable, net	78,259	104,296
Allowance for credit losses on loans			884
Real estate construction and land development | Commercial and multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		170,350
Loans receivable, net	227,454	170,350
Allowance for credit losses on loans			8,845
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans receivable		415,340
Loans receivable, net	$ 324,972	$ 415,340
Allowance for credit losses on loans			$ 4,337

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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 unamortized loan commitment, origination, and other fees (costs) and purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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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.

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Amount after allowance and 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 and loans held for sale.

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