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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Available-for-sale Securities | $ 865,903 |  | $ 865,903 |  | $ 909,247
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | $ 0 | 0 | $ 0 |
Impaired loans considered to be credit risk of non-collection | 100 |  | 100 |  |
Updated appraisal requirement floor | 250 |  | 250 |  |
Other real estate owned | 1,884 |  | 1,884 |  | 3,935
Financial instrument of credit risk | 200 |  | 200 |  | $ 200
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Other Income, Assets and Liabilities Continue to be held | 0 | 0 | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | 0 | 0 |
Total gains or losses included in earnings | 0 | 5,262 | (47) | 8,102 |
Other Assets [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | 0 | 0 |
Total gains or losses included in earnings | $ 0 | $ 0 | $ (47) | $ 0 |
Minimum [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Swap Rates Term Used to Determine Yield Curve |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Swap Rates Term Used to Determine Yield Curve |  |  | 30 years |  |

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