XML 27 R81.htm IDEA: XBRL DOCUMENT v3.20.1
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