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Interest Rate Swaps - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 07, 2018 | May 03, 2011 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivatives designated as fair value hedges |  |  | $ 0 | $ 0
Accumulated other comprehensive loss estimated |  |  | 17,000 |
Interest Rate Swaps |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Cash collateral balance |  |  | $ 200,000 | $ 1,400,000
Unsecured Debt |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Term of contract | 5 years | 5 years |  |
Cash flow hedges | $ 10,000,000 | $ 10,000,000 |  |
Unsecured Debt | LIBOR Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Variable interest rate on subordinate debt |  |  | 4.36% |
Unsecured Debt | LIBOR Plus 155 basis points at 2.98% |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Variable interest rate on subordinate debt |  |  | 4.53% |
Derivative fixed interest rate rate basis |  |  | 2.98% |
LIBOR | Unsecured Debt | LIBOR Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivative basis spread on variable rate |  |  | 155.00% |
LIBOR | Unsecured Debt | LIBOR Plus 155 basis points at 2.98% |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivative basis spread on variable rate |  |  | 155.00% |

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