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Loans, Loan Ratings by Loan Class, Commercial, Mortgage and Installment Segments (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Loan ratings/credit scores by loan class [Abstract]        
Commercial   $ 1,168,404   $ 1,144,481
Accrued interest included in total   8,783   8,538
Other Real Estate and Foreclosed Assets [Abstract]        
Foreclosed residential real estate properties   1,200   1,200
Retail mortgage loans in process of foreclosure   100   300
Sale of Mortgage Loans [Abstract]        
Proceeds from sale of mortgage loan $ 16,460 40,630 $ 16,460  
Net gains on mortgage loans $ 50 3,611 $ 2,571  
Residential Adjustable Rate Mortgage Loans [Member]        
Sale of Mortgage Loans [Abstract]        
Proceeds from sale of mortgage loan   40,630    
Net gains on mortgage loans   10    
Residential Fixed Rate Mortgage Loans [Member] | Freddie Mac [Member]        
Sale of Mortgage Loans [Abstract]        
Proceeds from sale of mortgage loan   29,800    
Net gains on mortgage loans   530    
Commercial [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   1,171,841   1,147,892
Accrued interest included in total   3,437   3,411
Commercial [Member] | Non-Watch 1-6 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   1,107,378   1,082,510
Accrued interest included in total   3,207   3,107
Commercial [Member] | Watch 7-8 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   57,639   57,184
Accrued interest included in total   215   174
Commercial [Member] | Substandard Accrual 9 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   5,119   5,777
Accrued interest included in total   15   130
Commercial [Member] | Non-Accrual 10-11 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   1,705   2,421
Accrued interest included in total   0   0
Commercial [Member] | Income Producing - Real Estate [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   398,191   388,773
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Watch 1-6 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   383,117   375,142
Commercial [Member] | Income Producing - Real Estate [Member] | Watch 7-8 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   14,603   13,387
Commercial [Member] | Income Producing - Real Estate [Member] | Substandard Accrual 9 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   471   200
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Accrual 10-11 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   0   44
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   84,861   84,458
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Watch 1-6 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   78,062   76,120
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Watch 7-8 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   6,790   8,328
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Substandard Accrual 9 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   9   0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Accrual 10-11 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   0   10
Commercial [Member] | Commercial and Industrial [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   688,789   674,661
Commercial [Member] | Commercial and Industrial [Member] | Non-Watch 1-6 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   646,199   631,248
Commercial [Member] | Commercial and Industrial [Member] | Watch 7-8 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   36,246   35,469
Commercial [Member] | Commercial and Industrial [Member] | Substandard Accrual 9 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   4,639   5,577
Commercial [Member] | Commercial and Industrial [Member] | Non-Accrual 10-11 [Member]        
Loan ratings/credit scores by loan class [Abstract]        
Commercial   1,705   2,367
Mortgage [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   118,503   121,012
750-799 [1]   469,555   476,484
700-749 [1]   259,930   252,126
650-699 [1]   119,134   114,460
600-649 [1]   42,237   41,748
550-599 [1]   16,128   17,301
500-549 [1]   9,741   9,789
Under 500 [1]   3,191   3,155
Unknown [1]   9,588   10,912
Total [1]   1,048,007   1,046,987
Accrued interest included in total [1]   4,262   4,097
Mortgage [Member] | 1-4 Family [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   89,359   94,492
750-799 [1]   365,405   384,344
700-749 [1]   199,489   202,440
650-699 [1]   93,517   91,847
600-649 [1]   34,459   34,342
550-599 [1]   12,701   13,771
500-549 [1]   8,341   8,439
Under 500 [1]   2,575   2,533
Unknown [1]   7,222   8,236
Total [1]   813,068   840,444
Accrued interest included in total [1]   3,220   3,079
Mortgage [Member] | Resort Lending [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   10,921   10,898
750-799 [1]   34,625   36,542
700-749 [1]   16,177   17,282
650-699 [1]   9,853   9,945
600-649 [1]   2,926   3,088
550-599 [1]   1,673   1,867
500-549 [1]   105   106
Under 500 [1]   141   143
Unknown [1]   1,807   1,910
Total [1]   78,228   81,781
Accrued interest included in total [1]   386   363
Mortgage [Member] | Home Equity - 1st Lien [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   6,788   6,784
750-799 [1]   15,976   17,303
700-749 [1]   9,063   9,155
650-699 [1]   3,673   3,987
600-649 [1]   811   959
550-599 [1]   425   427
500-549 [1]   408   418
Under 500 [1]   95   98
Unknown [1]   0   113
Total [1]   37,239   39,244
Accrued interest included in total [1]   177   199
Mortgage [Member] | Home Equity - 2nd Lien [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   11,435   8,838
750-799 [1]   53,549   38,295
700-749 [1]   35,201   23,249
650-699 [1]   12,091   8,681
600-649 [1]   4,041   3,359
550-599 [1]   1,329   1,236
500-549 [1]   887   826
Under 500 [1]   380   381
Unknown [1]   559   653
Total [1]   119,472   85,518
Accrued interest included in total [1]   479   456
Installment [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   50,954   48,026
750-799 [1]   214,866   208,972
700-749 [1]   89,710   87,978
650-699 [1]   27,562   28,162
600-649 [1]   7,332   7,668
550-599 [1]   3,076   3,360
500-549 [1]   1,635   1,775
Under 500 [1]   466   548
Unknown [1]   12,129   9,690
Total [1]   407,730   396,179
Accrued interest included in total [1]   1,084   1,030
Installment [Member] | Home Equity - 1st Lien [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   477   555
750-799 [1]   1,385   1,502
700-749 [1]   1,505   1,582
650-699 [1]   1,419   1,606
600-649 [1]   965   996
550-599 [1]   719   759
500-549 [1]   369   384
Under 500 [1]   49   51
Unknown [1]   0   2
Total [1]   6,888   7,437
Accrued interest included in total [1]   26   28
Installment [Member] | Home Equity - 2nd Lien [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   222   235
750-799 [1]   1,517   1,642
700-749 [1]   1,534   1,682
650-699 [1]   1,126   1,217
600-649 [1]   1,210   1,272
550-599 [1]   542   658
500-549 [1]   215   229
Under 500 [1]   6   6
Unknown [1]   55   103
Total [1]   6,427   7,044
Accrued interest included in total [1]   21   25
Installment [Member] | Boat Lending [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   22,262   20,767
750-799 [1]   103,947   100,191
700-749 [1]   36,372   35,455
650-699 [1]   10,298   10,581
600-649 [1]   1,595   1,657
550-599 [1]   611   652
500-549 [1]   233   286
Under 500 [1]   256   266
Unknown [1]   15   39
Total [1]   175,589   169,894
Accrued interest included in total [1]   437   403
Installment [Member] | Recreational Vehicle Lending [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   21,759   20,197
750-799 [1]   76,235   74,154
700-749 [1]   25,628   24,890
650-699 [1]   4,858   4,918
600-649 [1]   960   992
550-599 [1]   436   453
500-549 [1]   216   225
Under 500 [1]   6   7
Unknown [1]   0   0
Total [1]   130,098   125,836
Accrued interest included in total [1]   333   311
Installment [Member] | Other [Member]        
Loan ratings/credit scores by loan class [Abstract]        
800 and above [1]   6,234   6,272
750-799 [1]   31,782   31,483
700-749 [1]   24,671   24,369
650-699 [1]   9,861   9,840
600-649 [1]   2,602   2,751
550-599 [1]   768   838
500-549 [1]   602   651
Under 500 [1]   149   218
Unknown [1]   12,059   9,546
Total [1]   88,728   85,968
Accrued interest included in total [1]   $ 267   $ 263
[1] Credit scores have been updated within the last twelve months.