Loans (Non-accrual Loans, Loans Past Due 90 Days And Other Real Estate Owned And Delinquent Loans By Loan Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	$ 5,645	$ 5,796
Loans past due 90 days or more and still accruing	2,245	3,264
Total non-performing loans	1,976,123	1,814,488
Total non-performing assets	7,890	9,060
Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	5,645	5,796
Non-Performing Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-performing loans	7,890	9,060
SBL Non Real Estate [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	3,565	3,693
Total non-performing loans	84,946	84,579
SBL Non Real Estate [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	3,565	3,693
SBL Commercial Mortgage [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	1,047	1,047
Total non-performing loans	233,220	218,110
SBL Commercial Mortgage [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	1,047	1,047
SBL Construction [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	711	711
Total non-performing loans	48,823	45,310
SBL Construction [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	711	711
Consumer Loan [Member] | Non-Accrual Loans [Member]
Financing Receivables Past Due and Other Real Estate Owned [Line Items]
Total non-accrual loans	$ 322	$ 345