Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details)				12 Months Ended
	Mar. 06, 2020 $ / shares shares	Jan. 01, 2020 USD ($)	May 31, 2018	Dec. 31, 2020 USD ($) segment unit_Facility $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Jul. 16, 2019 shares
Schedule Of Accounting Policies [Line Items]
Full service facilities maintained by bank | unit_Facility				73
Accrued Interest Receivable				$ 13,300,000
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status				6 months
Commercial loans as a percentage of total loan				57.00%
Residential real estate loans as a percentage of total loan				16.00%
Installment loans as a percentage of total loan				17.00%
Mortgage warehouse loans as a percentage of total loan				10.00%
Investment in limited partnerships				$ 2,300,000	$ 1,200,000
Core deposit intangibles				23,000,000.0
Goodwill				$ 151,238,000	$ 151,238,000	$ 119,880,000
Uncertain tax positions recognized				50.00%
Shares, non-dilutive (in shares) | shares				278,776	120,341	102,138
Number of shares authorized to be repurchased | shares							2,250,000
Stock split			1.5
Number of shares repurchased | shares	1,000,000			373,323
Average price per share repurchased | $ / shares	$ 15.19			$ 15.86
Amount available for payment of dividend				$ 47,800,000
Compensation expense				$ 1,300,000	$ 920,000	$ 626,000
Number of business segment | segment				1
Reclassifications effect on net income				$ 0
Impact of adoption of ASU No. 2016-13					15,635,000
PCD loans charge–offs				$ 2,105,000
Retained Earnings
Schedule Of Accounting Policies [Line Items]
Impact of adoption of ASU No. 2016-13					$ 15,635,000
Measurement Input, Discount Rate
Schedule Of Accounting Policies [Line Items]
Factor considered to be significant for fair value measurement				0.10
Minimum
Schedule Of Accounting Policies [Line Items]
Loan delinquency period				90 days
Maximum
Schedule Of Accounting Policies [Line Items]
Allowance for loan losses charge down family first and junior lien mortgages past due period				180 days
Allowance for loan losses charge down unsecured open end loans past due period				90 days
Buildings and improvements | Minimum
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation				3 years
Buildings and improvements | Maximum
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation				40 years
Furniture and equipment | Minimum
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation				2 years
Furniture and equipment | Maximum
Schedule Of Accounting Policies [Line Items]
Useful Life for depreciation				20 years
Accounting Standards Update 2016-13
Schedule Of Accounting Policies [Line Items]
PCD loans charge–offs		$ 2,800,000
Accounting Standards Update 2016-13 | Retained Earnings
Schedule Of Accounting Policies [Line Items]
Impact of adoption of ASU No. 2016-13				$ 15,600,000