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Loans and Allowance for Loan Losses (Allowance For Loan Losses By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable Impaired [Line Items]      
Beginning Balance $ 11,218 $ 8,787 $ 8,787
Cumulative effect adjustment for adoption of ASC 326 2,077    
Charge-Offs (75) (47) (659)
Recoveries 21 35 1,260
Provision for credit losses 709 540 1,830
Ending Balance 13,950 9,315 11,218
Ending balance: Individually evaluated for impairment 73   100
Ending balance: collectively evaluated for impairment 13,877   11,118
Ending balance 1,393,091   1,316,340
Ending balance individually evaluated for impairment 1,733   6,621
Ending balance collectively evaluated for impairment 1,391,358   1,309,719
Construction And Farmland Financing Receivable      
Financing Receivable Impaired [Line Items]      
Beginning Balance 2,714 2,794 2,794
Cumulative effect adjustment for adoption of ASC 326 (1,840)    
Recoveries 1   9
Provision for credit losses (3)   (89)
Ending Balance 872   2,714
Ending balance: collectively evaluated for impairment 872   2,714
Ending balance 90,660   89,651
Ending balance individually evaluated for impairment 100   1,044
Ending balance collectively evaluated for impairment 90,560   88,607
Residential Real Estate      
Financing Receivable Impaired [Line Items]      
Beginning Balance 1,735 1,671 1,671
Cumulative effect adjustment for adoption of ASC 326 1,933    
Charge-Offs 0   (9)
Recoveries 5   888
Provision for credit losses (106)   (815)
Ending Balance 3,779   1,735
Ending balance: Individually evaluated for impairment 0   27
Ending balance: collectively evaluated for impairment 3,779   1,708
Ending balance 296,835   291,167
Ending balance individually evaluated for impairment 220   3,719
Ending balance collectively evaluated for impairment 296,615   287,448
Commercial Real Estate      
Financing Receivable Impaired [Line Items]      
Beginning Balance 2,221 1,729 1,729
Cumulative effect adjustment for adoption of ASC 326 3,584    
Recoveries 0   197
Provision for credit losses 468   295
Ending Balance 6,273   2,221
Ending balance: collectively evaluated for impairment 6,273   2,221
Ending balance 591,907   547,441
Ending balance individually evaluated for impairment 1,340   1,695
Ending balance collectively evaluated for impairment 590,567   545,746
Commercial Portfolio Segment      
Financing Receivable Impaired [Line Items]      
Beginning Balance 2,222 1,294 1,294
Cumulative effect adjustment for adoption of ASC 326 (1,102)    
Charge-Offs     (300)
Recoveries 5   109
Provision for credit losses 59   1,119
Ending Balance 1,066   2,222
Ending balance: Individually evaluated for impairment 73   73
Ending balance: collectively evaluated for impairment 993   2,149
Ending balance 102,197   99,645
Ending balance individually evaluated for impairment 73   141
Ending balance collectively evaluated for impairment 102,124   99,504
Consumer Portfolio Segment      
Financing Receivable Impaired [Line Items]      
Beginning Balance 299 219 219
Cumulative effect adjustment for adoption of ASC 326 (123)    
Charge-Offs (6)   (79)
Recoveries 4   44
Provision for credit losses 12   115
Ending Balance 186   299
Ending balance: collectively evaluated for impairment 186   299
Ending balance 43,841   44,841
Ending balance individually evaluated for impairment 0   22
Ending balance collectively evaluated for impairment 43,841   44,819
Marine Segment [Member]      
Financing Receivable Impaired [Line Items]      
Beginning Balance 1,555 789 789
Cumulative effect adjustment for adoption of ASC 326 (285)    
Recoveries     0
Provision for credit losses 126   766
Ending Balance 1,396   1,555
Ending balance: collectively evaluated for impairment 1,396   1,555
Ending balance 253,893   230,874
Ending balance collectively evaluated for impairment 253,893   230,874
All Other Loans      
Financing Receivable Impaired [Line Items]      
Beginning Balance 472 $ 291 291
Cumulative effect adjustment for adoption of ASC 326 (90)    
Charge-Offs (69)   (271)
Recoveries 6   13
Provision for credit losses 59   439
Ending Balance 378   472
Ending balance: collectively evaluated for impairment 378   472
Ending balance 13,758   12,721
Ending balance collectively evaluated for impairment 13,758   $ 12,721
Unallocated Financing Receivables      
Financing Receivable Impaired [Line Items]      
Cumulative effect adjustment for adoption of ASC 326 0    
Provision for credit losses 0    
Ending Balance 0    
Ending balance: collectively evaluated for impairment $ 0