Income Taxes - Summary of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	$ 24,158	$ 8,949
Other real estate owned	422	8
Accrued stock compensation	1,973	2,406
Federal tax loss carryforward	2,857	3,601
State tax loss carryforward	1,333	1,110
Alternative minimum tax credit carryforward	0	530
Lease liabilities	7,101	7,381
Deferred compensation	2,565	2,458
Accrued interest and fee income	995	3,106
Other	38	378
Gross deferred tax assets	41,442	29,927
Less: Valuation allowance	0	0
Deferred tax assets net of valuation allowance	41,442	29,927
Deferred Tax Liabilities, Gross [Abstract]
Core deposit base intangible	(3,234)	(4,005)
Net unrealized securities gains	(5,890)	(1,210)
Premises and equipment	(534)	(114)
Right of use assets	(6,262)	(6,416)
Other	(1,893)	(1,725)
Gross deferred tax liabilities	(17,813)	(13,470)
Net deferred tax assets	$ 23,629	$ 16,457