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Loans, Balance in Allowance for Loan and Lease Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Allowance for loan losses [Roll Forward]            
Beginning balance   $ 35,096 $ 34,998 $ 35,096 $ 35,908 $ 35,908
Provision charged to expense     1,253   3,006 4,819
Losses charged off     (2,316)   (7,168) (9,736)
Recoveries     876   3,065 4,105
Ending balance $ 47,986 [1]   34,811 47,986 [1] 34,811 35,096
Ending balance [Abstract]            
Individually evaluated for impairment     672   672 1,212
Collectively evaluated for impairment     34,139   34,139 33,884
Loans ending balance [Abstract]            
Individually evaluated for impairment     56,315   56,315 57,771
Collectively evaluated for impairment     3,158,470   3,158,470 3,190,893
Increase (decrease) in allowance for credit loss balance 2,500     $ 1,200    
Period of reasonable and supportable forecast       12 months    
Increase (decrease) in allowance for credit losses $ 1,400          
Increase (decrease) in allowance for credit losses, percentage 300.00%          
Allocations to allowance for credit losses $ 2,433   1,253 $ 15,091 [2] 3,006  
Real Estate Mortgage [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   5,501   5,501    
Ending balance           5,501
Consumer Direct [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   1,711   1,711    
Ending balance           1,711
Consumer Indirect [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   6,201   6,201    
Ending balance           6,201
Commercial [Member] | Construction [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   1,299 799 1,299 862 862
Provision charged to expense     299   301 497
Losses charged off     (1)   (72) (72)
Recoveries     3   9 12
Ending balance     1,100   1,100 1,299
Ending balance [Abstract]            
Individually evaluated for impairment     99   99 99
Collectively evaluated for impairment     1,001   1,001 1,200
Loans ending balance [Abstract]            
Individually evaluated for impairment     2,974   2,974 3,010
Collectively evaluated for impairment     90,560   90,560 101,799
Commercial [Member] | Real Estate Mortgage [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   14,025 15,098 14,025 14,531 14,531
Provision charged to expense     (742)   79 (137)
Losses charged off     (21)   (401) (727)
Recoveries     40   166 358
Ending balance     14,375   14,375 14,025
Ending balance [Abstract]            
Individually evaluated for impairment     398   398 227
Collectively evaluated for impairment     13,977   13,977 13,798
Loans ending balance [Abstract]            
Individually evaluated for impairment     39,986   39,986 41,379
Collectively evaluated for impairment     1,134,778   1,134,778 1,128,596
Commercial [Member] | Equipment Lease Financing [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   4 7 4 12 12
Provision charged to expense     (2)   (7) (8)
Losses charged off     0   0 0
Recoveries     0   0 0
Ending balance     5   5 4
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     5   5 4
Loans ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     651   651 481
Commercial [Member] | Commercial Other [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   6,355 4,889 6,355 4,993 4,993
Provision charged to expense     1,436   2,055 3,032
Losses charged off     (638)   (1,703) (2,179)
Recoveries     75   417 509
Ending balance     5,762   5,762 6,355
Ending balance [Abstract]            
Individually evaluated for impairment     175   175 886
Collectively evaluated for impairment     5,587   5,587 5,469
Loans ending balance [Abstract]            
Individually evaluated for impairment     11,037   11,037 11,073
Collectively evaluated for impairment     377,495   377,495 378,610
Residential [Member] | Construction [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   372 358 372 512 512
Provision charged to expense     (28)   (181) (40)
Losses charged off     0   (1) (100)
Recoveries     0   0 0
Ending balance     330   330 372
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     330   330 372
Loans ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     62,859   62,859 63,350
Residential [Member] | Real Estate Mortgage [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   4,232 4,187 4,232 4,433 4,433
Provision charged to expense     705   726 414
Losses charged off     (384)   (684) (767)
Recoveries     10   43 152
Ending balance     4,518   4,518 4,232
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     4,518   4,518 4,232
Loans ending balance [Abstract]            
Individually evaluated for impairment     2,318   2,318 2,309
Collectively evaluated for impairment     720,314   720,314 730,694
Allocations to allowance for credit losses 524     1,511    
Residential [Member] | Home Equity Lines [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   897 933 897 841 841
Provision charged to expense     32   181 172
Losses charged off     (40)   (99) (139)
Recoveries     2   4 23
Ending balance     927   927 897
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     927   927 897
Loans ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     110,663   110,663 111,894
Allocations to allowance for credit losses 56     88    
Consumer [Member] | Consumer Direct [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   1,711 1,767 1,711 1,883 1,883
Provision charged to expense     104   385 528
Losses charged off     (218)   (795) (1,100)
Recoveries     82   262 400
Ending balance     1,735   1,735 1,711
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     1,735   1,735 1,711
Loans ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     149,500   149,500 148,051
Allocations to allowance for credit losses 42     715    
Consumer [Member] | Consumer Indirect [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   6,201 6,960 6,201 7,841 7,841
Provision charged to expense     (551)   (533) 361
Losses charged off     (1,014)   (3,413) (4,652)
Recoveries     664   2,164 2,651
Ending balance     6,059   6,059 6,201
Ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     6,059   6,059 6,201
Loans ending balance [Abstract]            
Individually evaluated for impairment     0   0 0
Collectively evaluated for impairment     $ 511,650   $ 511,650 527,418
Allocations to allowance for credit losses $ 253     3,258    
ASU 2016-13 [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   38,137   38,137    
Ending balance           38,137
ASU 2016-13 [Member] | Inherent Model Risk [Member]            
Loans ending balance [Abstract]            
Increase (decrease) in allowance for credit loss balance   (1,600)        
ASU 2016-13 [Member] | Real Estate Mortgage [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   7,319   7,319    
Ending balance           7,319
ASU 2016-13 [Member] | Consumer Direct [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   1,671   1,671    
Ending balance           1,671
ASU 2016-13 [Member] | Consumer Indirect [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance   $ 7,467   $ 7,467    
Ending balance           $ 7,467
[1] Effective January 1, 2020, the allowance for loan and lease losses became the allowance for credit losses with the implementation of ASU 2016-13, commonly referred to as CECL.
[2] Effective January 1, 2020, the provision for loan losses became the provision for credit losses with the implementation of ASU 2016-13, commonly referred to as CECL.