Loans Receivable, Net - Collateral-Dependent Loans (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	$ 64,455
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	3,402
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	15,818
Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	42,041
Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	2,713
Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	481
Business assets
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	4,325
Business assets | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Business assets | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	37
Business assets | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	4,288
Business assets | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Business assets | Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	7,148
Residential Real Estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	3,338
Residential Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,043
Residential Real Estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	198
Residential Real Estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	2,513
Residential Real Estate | Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	56
Other real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	16,127
Other real estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	64
Other real estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	14,738
Other real estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,086
Other real estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	200
Other real estate | Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	39
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	36,855
Other | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Other | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Other | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	36,469
Other | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0
Other | Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	$ 386