Loans (Non-accrual Loans, Loans Past Due 90 Days And Other Real Estate Owned And Delinquent Loans By Loan Category) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	$ 6,106,000	$ 12,227,000
Loans past due 90 days or more and still accruing	1,569,000	497,000
Total non-performing loans	3,125,584,000	2,643,384,000
Other real estate owned	2,145,000	0
Total non-performing assets	9,820,000	12,724,000
Non-Performing Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-performing loans	7,675,000	12,724,000
SBL Non Real Estate [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	1,708,000	3,159,000
Total non-performing loans	171,845,000	255,318,000
SBL Non Real Estate [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	14,000
SBL Commercial Mortgage [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	3,167,000	7,305,000
Total non-performing loans	367,272,000	300,817,000
SBL Commercial Mortgage [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	76,000	301,000
SBL Construction [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	711,000	711,000
Total non-performing loans	23,117,000	20,273,000
SBL Construction [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	430,000	751,000
Direct Lease Financing [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	430,000	751,000
Total non-performing loans	514,068,000	462,182,000
Direct Lease Financing [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	711,000	711,000
Consumer - Home Equity [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	76,000	301,000
Consumer - Home Equity [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	3,167,000	7,305,000
Consumer - Other [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	14,000
Consumer - Other [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	$ 1,708,000	$ 3,159,000