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Securities (Net Gains and Losses on Trading Account Securities) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |
Net gain on sales transactions | $ 1,102 | $ 2,173 | $ 1,816
Net mark-to-market gains (losses) | 85 | (176) | 105
Net gain on trading account securities | $ 1,187 | $ 1,997 | $ 1,921

X
- Definition This item represents the difference between the gross amount of gains (losses) included in earnings for transfers of securities from the available-for-sale category into the trading category. Such net gain (loss) included in earnings represents the net unrealized gain (loss) which had been included in other comprehensive income and is associated with the securities transferred from the available-for-sale category to the trading category. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesTransfersToTradingGainsLossesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the gain realized during the period from the sale of trading securities. + References No definition available. + Details
Name: | us-gaap_TradingSecuritiesRealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) realized from securities classified as trading. + References No definition available. + Details
Name: | us-gaap_TradingSecuritiesRealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration