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Other Financial Assets and Financial Liabilities - Additional Information (Detail) ฿ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 THB (฿)
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Subordinated debentures of Bangkok Bank Public Company Limited |  | $ 309,000 |  | ฿ 11
Subordinated debentures of Bangkok Bank Public Company Limited, fixed interest rate |  | 4.375% |  |
Subordinated debentures of Bangkok Bank Public Company Limited, maturity |  | 10 years |  |
Dividends received | $ 100,000 | $ 96,000 | $ 99,000 |
Maximum borrowing capacity | 250,923,000 | 233,837,000 |  |
Unused portion of the credit lines | 144,000,000 |  |  |
Outstanding forward contracts, recognized gain (loss) | $ (332,000) | $ 171,000 | 20,000 |
Liquidity discount | 30.00% | 30.00% |  |
Line Of Credit 1 [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Unused portion of the credit lines | $ 144,478,000 | $ 139,854,000 |  |
Letters of Credit [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Unused portion of the credit lines | 74,911,000 | 74,039,000 |  |
Open letters of credit [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Unused portion of the credit lines | 37,559,000 | 24,743,000 |  |
Foreign currency forward contracts [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Outstanding forward contracts, notional amount | (18,900,000) | 9,500,000 |  |
Outstanding forward contracts, recognized gain (loss) | $ (332,000) | $ 171,000 | $ 20,000 |

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