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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Loans with a specific valuation allowance [Abstract]          
Specific Allowance $ 736 $ 1,391 $ 736 $ 1,391 $ 991
Total impaired loans [Abstract]          
Recorded balance 46,883 46,199 46,883 46,199 47,412
Unpaid Contractual Principal Balance 51,693 49,740 51,693 49,740 52,212
Specific Allowance 736 1,391 736 1,391 991
Average Investment in Impaired Loans 45,825 46,629 47,274 49,684 49,343
Interest Income Recognized [1] 521 460 1,647 1,550 2,127
Commercial [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 2,804 4,613 2,804 4,613 4,431
Unpaid Contractual Principal Balance 2,804 4,621 2,804 4,621 4,439
Average Investment in Impaired Loans 2,865 4,662 3,795 4,955 4,835
Interest Income Recognized [1] 26 50 132 136 200
Loans with a specific valuation allowance [Abstract]          
Recorded Balance   153   153 153
Unpaid Contractual Principal Balance   174   174 173
Specific Allowance 0 25 0 25 25
Average Investment in Impaired Loans   153   156 155
Interest Income Recognized [1]   0   0 0
Total impaired loans [Abstract]          
Recorded balance 2,804 4,766 2,804 4,766 4,584
Unpaid Contractual Principal Balance 2,804 4,795 2,804 4,795 4,612
Specific Allowance 0 25 0 25 25
Average Investment in Impaired Loans 2,865 4,815 3,795 5,111 4,990
Interest Income Recognized [1] 26 50 132 136 200
Commercial [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 31,632 25,322 31,632 25,322 28,480
Unpaid Contractual Principal Balance 33,538 25,916 33,538 25,916 30,365
Average Investment in Impaired Loans 30,216 25,452 30,588 27,318 27,753
Interest Income Recognized [1] 349 276 1,073 980 1,344
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 1,980 3,918 1,980 3,918 2,985
Unpaid Contractual Principal Balance 3,116 5,023 3,116 5,023 4,095
Specific Allowance 641 1,301 641 1,301 966
Average Investment in Impaired Loans 2,005 3,984 2,112 4,236 3,932
Interest Income Recognized [1] 0 3 1 8 8
Total impaired loans [Abstract]          
Recorded balance 33,612 29,240 33,612 29,240 31,465
Unpaid Contractual Principal Balance 36,654 30,939 36,654 30,939 34,460
Specific Allowance 641 1,301 641 1,301 966
Average Investment in Impaired Loans 32,221 29,436 32,700 31,554 31,685
Interest Income Recognized [1] 349 279 1,074 988 1,352
Commercial [Member] | Equipment Lease Financing [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance         0
Unpaid Contractual Principal Balance         0
Average Investment in Impaired Loans   0   45 34
Interest Income Recognized [1]   0   0 0
Loans with a specific valuation allowance [Abstract]          
Specific Allowance         0
Total impaired loans [Abstract]          
Recorded balance         0
Unpaid Contractual Principal Balance         0
Specific Allowance         0
Average Investment in Impaired Loans   0   45 34
Interest Income Recognized [1]   0   0 0
Commercial [Member] | Other [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 8,268 9,994 8,268 9,994 9,481
Unpaid Contractual Principal Balance 10,034 11,804 10,034 11,804 11,252
Average Investment in Impaired Loans 8,518 10,191 8,857 10,717 10,444
Interest Income Recognized [1] 125 123 405 396 539
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 321 130 321 130 0
Unpaid Contractual Principal Balance 321 133 321 133 0
Specific Allowance 95 65 95 65 0
Average Investment in Impaired Loans 339 130 220 87 65
Interest Income Recognized [1] 8 0 12 0 0
Total impaired loans [Abstract]          
Recorded balance 8,589 10,124 8,589 10,124 9,481
Unpaid Contractual Principal Balance 10,355 11,937 10,355 11,937 11,252
Specific Allowance 95 65 95 65 0
Average Investment in Impaired Loans 8,857 10,321 9,077 10,804 10,509
Interest Income Recognized [1] 133 123 417 396 539
Residential [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance   873   873 318
Unpaid Contractual Principal Balance   873   873 318
Average Investment in Impaired Loans 0 860 106 569 534
Interest Income Recognized [1] 0 0 0 0 0
Loans with a specific valuation allowance [Abstract]          
Specific Allowance   0   0 0
Total impaired loans [Abstract]          
Recorded balance   873   873 318
Unpaid Contractual Principal Balance   873   873 318
Specific Allowance   0   0 0
Average Investment in Impaired Loans 0 860 106 569 534
Interest Income Recognized [1] 0 0 0 0 0
Residential [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,878 1,196 1,878 1,196 1,564
Unpaid Contractual Principal Balance 1,880 1,196 1,880 1,196 1,570
Average Investment in Impaired Loans 1,882 1,197 1,596 1,601 1,591
Interest Income Recognized [1] 13 8 24 30 36
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 1,878 1,196 1,878 1,196 1,564
Unpaid Contractual Principal Balance 1,880 1,196 1,880 1,196 1,570
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,882 1,197 1,596 1,601 1,591
Interest Income Recognized [1] $ 13 $ 8 $ 24 $ 30 $ 36
[1] Cash basis interest is substantially the same as interest income recognized.