Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) operating_segment commercial_banking_centers traditional_bank_offices	Jan. 01, 2019 USD ($)
Accounting Policies [Line Items]
Number of operating segments | operating_segment	1
Number of traditional bank offices | traditional_bank_offices	48
Number of commercial banking centers | commercial_banking_centers	9
Modified loan terms	6 months
Number of days past due	90 days
Number of days past due, consumer loans	120 days
Operating lease right-of-use assets	$ 26,165
Operating lease liabilities	$ 30,098
Stock Option
Accounting Policies [Line Items]
Vesting period	5 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
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 29,000
Operating lease liabilities		33,000
Operating lease right-of-use assets acquired		$ 4,000