XML 100 R74.htm IDEA: XBRL DOCUMENT v3.20.4
Allowance for Credit Losses and Unfunded Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Schedule of allowance for unfunded commitments and letters of credit [Line Items]          
Balance, Allowance For Unfunded Loan Commitments And Letters Of Credit $ 8,300 $ 3,430 $ 4,330   $ 3,130
Net changes in the allowance for unfunded commitments and letters of credit $ 3,300 (900) 1,200    
Accounting Standards Update 2016-13          
Schedule of allowance for unfunded commitments and letters of credit [Line Items]          
Change in allowance for unfunded commitments and letters of credit due to adoption of new ASU   $ 0 $ 0 $ 1,570