Income Taxes, Textuals (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	$ (251,000)	$ (251,000)	$ (269,000)
Tax Credit Carryforward, Amount	$ 5,000,000
Tax Credit Carryforward, Expiration Being Date	begin expiring in 2034
Bad debt from acquired savings banks	$ 100,000,000
Deferred tax on bad debt from acquired savings banks	25,000,000
Unrecognized tax benefit impact on effective tax rate	2,000,000	1,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		$ 1,000,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	106,000,000
Operating tax loss carryforwards from acquisitions	$ 49,000,000
Operating Loss Carryforwards, Expiration Begin Date	begin expiring in 2031
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 3,000,000