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Accounting Policies - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 06, 2020 | Jan. 01, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 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) |  |  | 492,273 | 340,540 | 273,776 |  |  |
Impact of adoption of ASU No. 2016-13 |  |  |  |  |  |  | $ 15,635,000 |
Initial PCD allowance |  | $ 2,800,000 |  |  | $ 2,786,000 |  |  |
Accrued interest receivable |  |  | $ 13,400,000 |  | $ 13,400,000 |  |  |
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 loan deferred due cost |  |  |  |  | $ 0 |  |  |
Mortgage warehousing maximum pay off period |  |  |  |  | 30 days |  |  |
Reclassifications effect on net income |  |  |  |  |  | $ 0 |  |
Retained Earnings |  |  |  |  |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Impact of adoption of ASU No. 2016-13 |  |  |  |  |  |  | 15,635,000 |
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 |  |  |  |  |  |  | $ 15,600,000 |

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