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Short-term FHLB Advances - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Banking and Thrift [Abstract]
Short-term FHLB advances	$ 0	$ 0
Average volume of FHLB balances	17,000	2,157,000
Additional FHLB advances	738,955,000	725,988,000
Loans pledged through the Bank's blanket lien	$ 768,549,000	$ 752,558,000

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The calculated average balance outstanding for the year for all Federal Home Loan Bank advances as of the Balance Sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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