Significant Accounting Policies - Additional Information (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2020 USD ($)	Dec. 31, 2020 USD ($) operating_segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Accounting Policies [Line Items]
Number of operating segments | operating_segment		1
Increase to amortized cost basis of PCD loans to reflect increase in adjustment to allowance for credit losses		$ 6,279
Unrealized losses		2,098	$ 4,547
Collateralized loan obligations
Accounting Policies [Line Items]
Unrealized losses	$ 1,200	$ 647	$ 1,153
Cumulative Effect Adjustment
Accounting Policies [Line Items]
Increase to amortized cost basis of PCD loans to reflect increase in adjustment to allowance for credit losses	700
Noncredit discount on PCD loans to be accredited into interest income over remaining life of loans	$ 900
Stock Option
Accounting Policies [Line Items]
Stock options, vesting period			5 years	5 years
Vesting period		5 years
Restricted Stock Units
Accounting Policies [Line Items]
Vesting period		3 years
Minimum | Core Deposits
Accounting Policies [Line Items]
Intangible assets, useful life		6 years
Maximum | Core Deposits
Accounting Policies [Line Items]
Intangible assets, useful life		8 years
Building | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		25 years
Building | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		40 years
Leasehold Improvements | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		5 years
Leasehold Improvements | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		25 years
Furniture and Equipment | Minimum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		3 years
Furniture and Equipment | Maximum
Accounting Policies [Line Items]
Bank premises and equipment, useful life		12 years