Allowance for Credit Losses on Loans - Amortized Cost Basis of Collateral-dependant Loans (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	$ 3,427
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	8,521
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,600
Real Estate | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	6,694
Business Assets
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	575
Business Assets | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	575
Uncollateralized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,252
Uncollateralized | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	1,252
CRE | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	5,094
CRE | Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Collateral dependent loans	$ 5,094