XML 127 R74.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Premises and Equipment - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Premises and Equipment      
Depreciation $ 5.8 $ 5.6 $ 5.4