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Loans and Allowance for Credit Losses (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allowance for credit losses allocated to:    
Beginning balance $ 13,888 $ 10,507
Charge-offs (65) (551)
Recoveries 65 72
Net (charge-offs) recoveries   (479)
Provision 425 350
Ending balance 14,313 10,378
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Allowance for credit losses allocated to:    
Beginning balance 2,022 1,576
Recoveries 5 3
Net (charge-offs) recoveries 5 3
Provision 769 (451)
Ending balance 2,796 1,128
Residential Portfolio Segment [Member]    
Allowance for credit losses allocated to:    
Beginning balance 3,699 2,501
Charge-offs   (191)
Recoveries 6 3
Net (charge-offs) recoveries 6 (188)
Provision (6) 169
Ending balance 3,699 2,482
Commercial Real Estate Portfolio Segment [Member]    
Allowance for credit losses allocated to:    
Beginning balance 5,426 4,032
Charge-offs   (271)
Recoveries   1
Net (charge-offs) recoveries   (270)
Provision (329) 203
Ending balance 5,097 3,965
Commercial Portfolio Segment [Member]    
Allowance for credit losses allocated to:    
Beginning balance 2,089 1,929
Charge-offs (61) (82)
Recoveries 52 63
Net (charge-offs) recoveries (9) (19)
Provision (80) 353
Ending balance 2,000 2,263
Consumer Portfolio Segment [Member]    
Allowance for credit losses allocated to:    
Beginning balance 652 469
Charge-offs (4) (7)
Recoveries 2 2
Net (charge-offs) recoveries (2) (5)
Provision 71 76
Ending balance $ 721 $ 540