Accounting Policies - Additional Information (Details) - USD ($)			3 Months Ended
	Mar. 06, 2020	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Jul. 16, 2019
Schedule Of Accounting Policies [Line Items]
Number of shares authorized to be repurchased					2,250,000
Number of shares repurchased	1,000,000		373,323
Average price per share repurchased	$ 15.19		$ 15.86
Shares, non-dilutive (in shares)			293,665	350,618
Impact of adoption of ASU No. 2016-13		$ (15,635,000)
Initial PCD Allowance		2,800,000	$ 2,786,000
Accrued interest receivable			$ 11,000,000.0
Loan delinquency period			90 days
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status			6 months
Period of loan sold by mortgage company			30 days
Minimum period seldom held			90 days
Mortgage warehousing maximum pay off period			30 days
Reclassifications effect on net income				$ 0
Mortgage loan deferred due cost			$ 0
Minimum
Schedule Of Accounting Policies [Line Items]
Loan delinquency period			90 days
Delay or shortfall in payments of loan			30 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
Allowance for loan losses charge down other secured loans past due period			90 days
Accounting Standards Update 2016-13 | Retained Earnings
Schedule Of Accounting Policies [Line Items]
Impact of adoption of ASU No. 2016-13		$ (15,635,000)