Loans and Allowance for Credit Losses on Loans - Amortized Cost Basis of Collateral-dependant Loans (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	$ 1,669
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	3,133
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	60
Real Estate | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,524
Business Assets
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,478
Business Assets | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,478
Uncollateralized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	131
Uncollateralized | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	131
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,464
Consumer and other | Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	$ 1,464