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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) |  |  |

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- Definition Allowance for loan losses charge down family first and junior lien mortgages past due period. + References No definition available. + Details
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- Definition Allowance for loan losses charge down other secured loans past due period. + References No definition available. + Details
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- Definition Delay Or Shortfall In Payments Of Loan Period + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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