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Loans (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance $ 28,263 $ 36,063 $ 28,263 $ 36,063 $ 37,208
Recorded investment with no allowance 22,205 32,701 22,205 32,701 32,813
Recorded investment with allowance 5,831 2,847 5,831 2,847 4,067
Total recorded investment 28,036 35,548 28,036 35,548 36,880
Related allowance 1,476 1,010 1,476 1,010 1,180
Average recorded investment 28,132 35,657 28,505 35,951 37,377
Interest income recognized 242 438 819 1,062 1,693
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 21,159 26,588 21,159 26,588 27,835
Recorded investment with no allowance 16,175 24,664 16,175 24,664 24,515
Recorded investment with allowance 4,799 1,561 4,799 1,561 3,025
Total recorded investment 20,974 26,225 20,974 26,225 27,540
Related allowance 444 174 444 174 326
Average recorded investment 21,023 26,297 21,309 26,499 27,833
Interest income recognized 183 340 591 763 1,275
Residential First Mortgages Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 2,089 2,655 2,089 2,655 2,527
Recorded investment with no allowance 2,089 2,616 2,089 2,616 2,527
Recorded investment with allowance   0   0 0
Total recorded investment 2,089 2,616 2,089 2,616 2,527
Related allowance 0 0 0 0 0
Average recorded investment 2,098 2,627 2,125 2,651 2,573
Interest income recognized 23 31 66 90 126
Residential Rentals Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 956 1,431 956 1,431 1,745
Recorded investment with no allowance 956 1,377 956 1,377 1,745
Total recorded investment 956 1,377 956 1,377 1,745
Average recorded investment 961 1,382 977 1,400 1,792
Interest income recognized 14 11 44 47 85
Construction And Land Development Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 0 729 0 729 729
Recorded investment with no allowance 0 729 0 729 729
Recorded investment with allowance 0 0 0 0 0
Total recorded investment 0 729 0 729 729
Related allowance 0 0 0 0 0
Average recorded investment 0 729 0 729 729
Interest income recognized 0 11 0 30 45
Home Equity And Second Mortgage Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 588 298 588 298 294
Recorded investment with no allowance 577 293 577 293 288
Recorded investment with allowance   0   0 0
Total recorded investment 577 293 577 293 288
Related allowance   0   0 0
Average recorded investment 580 300 579 304 291
Interest income recognized 5 4 21 10 13
Commercial Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 2,641 2,784 2,641 2,784 2,762
Recorded investment with no allowance 1,807 1,890 1,807 1,890 1,888
Recorded investment with allowance 822 883 822 883 863
Total recorded investment 2,629 2,773 2,629 2,773 2,751
Related allowance 822 458 822 458 700
Average recorded investment 2,648 2,775 2,669 2,779 2,804
Interest income recognized 9 38 65 89 118
Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance   1   1 1
Recorded investment with no allowance   0   0 0
Recorded investment with allowance   1   1 1
Total recorded investment   1   1  
Related allowance   1   1 1
Average recorded investment   1   1 1
Commercial Equipment Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance 830 1,577 830 1,577 1,315
Recorded investment with no allowance 601 1,132 601 1,132 1,121
Recorded investment with allowance 210 402 210 402 178
Total recorded investment 811 1,534 811 1,534 1,299
Related allowance 210 377 210 377 153
Average recorded investment 822 1,546 846 1,588 1,354
Interest income recognized $ 8 $ 3 $ 32 $ 33 $ 31