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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 672 | $ 736 | $ 672 | $ 736 | $ 801
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 56,315 | 46,883 | 56,315 | 46,883 | 46,366
Unpaid Contractual Principal Balance |  | 61,020 | 51,693 | 61,020 | 51,693 | 50,956
Specific Allowance |  | 672 | 736 | 672 | 736 | 801
Average Investment in Impaired Loans |  | 57,291 | 45,825 | 54,740 | 47,274 | 47,097
Interest Income Recognized | [1] | 603 | 521 | 1,821 | 1,647 | 2,171
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 2,800 | 2,804 | 2,800 | 2,804 | 4,100
Unpaid Contractual Principal Balance |  | 2,800 | 2,804 | 2,800 | 2,804 | 4,100
Average Investment in Impaired Loans |  | 2,959 | 2,865 | 3,344 | 3,795 | 3,923
Interest Income Recognized | [1] | 37 | 26 | 132 | 132 | 171
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 174 |  | 174 |  | 127
Unpaid Contractual Principal Balance |  | 174 |  | 174 |  | 127
Specific Allowance |  | 99 | 0 | 99 | 0 | 50
Average Investment in Impaired Loans |  | 174 |  | 229 |  | 42
Interest Income Recognized | [1] | 3 |  | 9 |  | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 2,974 | 2,804 | 2,974 | 2,804 | 4,227
Unpaid Contractual Principal Balance |  | 2,974 | 2,804 | 2,974 | 2,804 | 4,227
Specific Allowance |  | 99 | 0 | 99 | 0 | 50
Average Investment in Impaired Loans |  | 3,133 | 2,865 | 3,573 | 3,795 | 3,965
Interest Income Recognized | [1] | 40 | 26 | 141 | 132 | 171
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 38,620 | 31,632 | 38,620 | 31,632 | 29,645
Unpaid Contractual Principal Balance |  | 40,134 | 33,538 | 40,134 | 33,538 | 31,409
Average Investment in Impaired Loans |  | 39,217 | 30,216 | 35,762 | 30,588 | 30,250
Interest Income Recognized | [1] | 442 | 349 | 1,192 | 1,073 | 1,412
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,366 | 1,980 | 1,366 | 1,980 | 1,854
Unpaid Contractual Principal Balance |  | 2,863 | 3,116 | 2,863 | 3,116 | 2,983
Specific Allowance |  | 398 | 641 | 398 | 641 | 605
Average Investment in Impaired Loans |  | 1,397 | 2,005 | 1,892 | 2,112 | 2,051
Interest Income Recognized | [1] | 0 | 0 | 15 | 1 | 1
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 39,986 | 33,612 | 39,986 | 33,612 | 31,499
Unpaid Contractual Principal Balance |  | 42,997 | 36,654 | 42,997 | 36,654 | 34,392
Specific Allowance |  | 398 | 641 | 398 | 641 | 605
Average Investment in Impaired Loans |  | 40,614 | 32,221 | 37,654 | 32,700 | 32,301
Interest Income Recognized | [1] | 442 | 349 | 1,207 | 1,074 | 1,413
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 10,690 | 8,268 | 10,690 | 8,268 | 8,285
Unpaid Contractual Principal Balance |  | 12,384 | 10,034 | 12,384 | 10,034 | 9,982
Average Investment in Impaired Loans |  | 10,863 | 8,518 | 10,425 | 8,857 | 8,774
Interest Income Recognized | [1] | 92 | 125 | 380 | 405 | 530
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 347 | 321 | 347 | 321 | 473
Unpaid Contractual Principal Balance |  | 347 | 321 | 347 | 321 | 473
Specific Allowance |  | 175 | 95 | 175 | 95 | 146
Average Investment in Impaired Loans |  | 358 | 339 | 680 | 220 | 285
Interest Income Recognized | [1] | 6 | 8 | 29 | 12 | 16
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 11,037 | 8,589 | 11,037 | 8,589 | 8,758
Unpaid Contractual Principal Balance |  | 12,731 | 10,355 | 12,731 | 10,355 | 10,455
Specific Allowance |  | 175 | 95 | 175 | 95 | 146
Average Investment in Impaired Loans |  | 11,221 | 8,857 | 11,105 | 9,077 | 9,059
Interest Income Recognized | [1] | 98 | 133 | 409 | 417 | 546
Residential [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  |  |  |  | 0
Unpaid Contractual Principal Balance |  |  |  |  |  | 0
Average Investment in Impaired Loans |  |  | 0 |  | 106 | 106
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 |  | 106 | 106
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 2,318 | 1,878 | 2,318 | 1,878 | 1,882
Unpaid Contractual Principal Balance |  | 2,318 | 1,880 | 2,318 | 1,880 | 1,882
Average Investment in Impaired Loans |  | 2,323 | 1,882 | 2,408 | 1,596 | 1,666
Interest Income Recognized | [1] | 23 | 13 | 64 | 24 | 41
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 2,318 | 1,878 | 2,318 | 1,878 | 1,882
Unpaid Contractual Principal Balance |  | 2,318 | 1,880 | 2,318 | 1,880 | 1,882
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 2,323 | 1,882 | 2,408 | 1,596 | 1,666
Interest Income Recognized | [1] | $ 23 | $ 13 | $ 64 | $ 24 | $ 41
[1] | Cash basis interest is substantially the same as interest income recognized.

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