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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Reserve requirements | $ 0 | $ 0 |
Securities held for trading purposes | 0 | 0 |
Mortgage loans held for sale | 6,990,000 | 2,086,000 |
Outstanding loans sold to government agencies | $ 118,818,000 | $ 139,303,000 |
Period for appraises of property | 12 months | 12 months |
Other investments | $ 9,735,000 | $ 12,323,000 |
Income tax interest or penalties | 0 | 0 | $ 0
Accrued liability for interest or penalty payments | 0 | 0 | 0
Tax effect for unrealized gains (losses) on investment securities | 770,000 | (278,000) | (520,000)
Tax effect on reclassification adjustment in net income | 0 | 0 | $ 0
Right-of-use asset | 4,600,000 |  |
Lease liability | 4,600,000 |  |
ASU 2016-13 | Pro Forma |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimate of increase in allowance for loan losses expected to be reclassified from purchase discount for acquired impaired loans | $ 1,200,000 |  |
Servicing Contracts |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangibles | 10 years |  |
Nonrecurring |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Foreclosed assets and ORE | $ 4,156,000 | 1,558,000 |
Minimum |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 3 years |  |
Minimum | ASU 2016-13 | Pro Forma |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimate of increase in allowance for loan losses expected to be reclassified from purchase discount for acquired impaired loans (percent) | 30.00% |  |
Minimum | Core Deposits |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangibles | 9 years |  |
Maximum |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Maximum | ASU 2016-13 | Pro Forma |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimate of increase in allowance for loan losses expected to be reclassified from purchase discount for acquired impaired loans (percent) | 40.00% |  |
Maximum | Core Deposits |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of intangibles | 15 years |  |
U S Government Agencies |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |
Outstanding loans sold to government agencies | $ 118,818,000 | $ 139,303,000 |

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