Restrictions on Cash, Securities, Bank Dividends, Loans or Advances (Details)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Regulated Operations [Abstract]
Reserve requirements with federal reserve		$ 187,839,000
FHLB stock	$ 12,252,000	31,092,000
FHLB required investment amount	$ 11,594,000	$ 31,092,000
Regulatory restrictions on payments of dividends, excess surplus ratio	10
Amount transferable loans maximum	$ 150,478,000
Company borrowings	$ 0