Loans and Allowance for Credit Losses (Nonaccrual Loans by Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Nonaccrual loans:
Non-accrual with no allowance for credit loss	$ 1,907	$ 11,247
Non-accrual with an allowance for credit loss	10,869	1,537
Total Non-accruals	12,776	12,784
Interest income, non-accrual with no allowance for credit loss	187	399
Interest income, non-accrual with an allowance for credit loss	33	53
Interest income, total non-accruals	220	452
Non-accrual Delinquent Loans	5,837	6,504
Non-accrual Current Loans	6,939	6,280
Total Non-accruals	12,776	12,784
Construction
Nonaccrual loans:
Non-accrual with no allowance for credit loss	0	626
Non-accrual with an allowance for credit loss	476	0
Total Non-accruals	476	626
Non-accrual Delinquent Loans	210	221
Non-accrual Current Loans	266	405
Total Non-accruals	476	626
Residential real estate
Nonaccrual loans:
Non-accrual with no allowance for credit loss	4	5,865
Non-accrual with an allowance for credit loss	6,379	480
Total Non-accruals	6,383	6,345
Non-accrual Delinquent Loans	3,718	4,137
Non-accrual Current Loans	2,665	2,208
Total Non-accruals	6,383	6,345
Commercial real estate
Nonaccrual loans:
Non-accrual with no allowance for credit loss	0	4,364
Non-accrual with an allowance for credit loss	3,643	0
Total Non-accruals	3,643	4,364
Non-accrual Delinquent Loans	940	1,215
Non-accrual Current Loans	2,703	3,149
Total Non-accruals	3,643	4,364
Commercial
Nonaccrual loans:
Non-accrual with no allowance for credit loss	1,209	176
Non-accrual with an allowance for credit loss	147	368
Total Non-accruals	1,356	544
Non-accrual Delinquent Loans	51	28
Non-accrual Current Loans	1,305	516
Total Non-accruals	1,356	544
Consumer
Nonaccrual loans:
Non-accrual with no allowance for credit loss	694	216
Non-accrual with an allowance for credit loss	224	689
Total Non-accruals	918	905
Non-accrual Delinquent Loans	918	903
Non-accrual Current Loans	0	2
Total Non-accruals	$ 918	$ 905