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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 801 | $ 991 | $ 1,313
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 46,366 | 47,412 | 52,202
Unpaid Contractual Principal Balance |  | 50,956 | 52,212 | 55,888
Specific Allowance |  | 801 | 991 | 1,313
Average Investment in Impaired Loans |  | 47,097 | 49,343 | 55,679
Interest Income Recognized | [1] | 2,171 | 2,127 | 2,530
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,100 | 4,431 | 4,102
Unpaid Contractual Principal Balance |  | 4,100 | 4,439 | 4,123
Average Investment in Impaired Loans |  | 3,923 | 4,835 | 4,367
Interest Income Recognized | [1] | 171 | 200 | 218
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 127 | 153 | 1,507
Unpaid Contractual Principal Balance |  | 127 | 173 | 1,509
Specific Allowance |  | 50 | 25 | 213
Average Investment in Impaired Loans |  | 42 | 155 | 2,290
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 4,227 | 4,584 | 5,609
Unpaid Contractual Principal Balance |  | 4,227 | 4,612 | 5,632
Specific Allowance |  | 50 | 25 | 213
Average Investment in Impaired Loans |  | 3,965 | 4,990 | 6,657
Interest Income Recognized | [1] | 171 | 200 | 218
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 29,645 | 28,480 | 29,025
Unpaid Contractual Principal Balance |  | 31,409 | 30,365 | 29,594
Average Investment in Impaired Loans |  | 30,250 | 27,753 | 31,136
Interest Income Recognized | [1] | 1,412 | 1,344 | 1,609
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,854 | 2,985 | 4,731
Unpaid Contractual Principal Balance |  | 2,983 | 4,095 | 5,885
Specific Allowance |  | 605 | 966 | 1,035
Average Investment in Impaired Loans |  | 2,051 | 3,932 | 4,151
Interest Income Recognized | [1] | 1 | 8 | 19
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 31,499 | 31,465 | 33,756
Unpaid Contractual Principal Balance |  | 34,392 | 34,460 | 35,479
Specific Allowance |  | 605 | 966 | 1,035
Average Investment in Impaired Loans |  | 32,301 | 31,685 | 35,287
Interest Income Recognized | [1] | 1,413 | 1,352 | 1,628
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 0 | 0
Unpaid Contractual Principal Balance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 0 | 34 | 0
Interest Income Recognized | [1] | 0 | 0 | 0
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 0 | 0 | 0
Unpaid Contractual Principal Balance |  | 0 | 0 | 0
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 0 | 34 | 0
Interest Income Recognized | [1] | 0 | 0 | 0
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 8,285 | 9,481 | 11,215
Unpaid Contractual Principal Balance |  | 9,982 | 11,252 | 13,155
Average Investment in Impaired Loans |  | 8,774 | 10,444 | 11,561
Interest Income Recognized | [1] | 530 | 539 | 632
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 473 | 0 | 139
Unpaid Contractual Principal Balance |  | 473 | 0 | 139
Specific Allowance |  | 146 | 0 | 65
Average Investment in Impaired Loans |  | 285 | 65 | 483
Interest Income Recognized | [1] | 16 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 8,758 | 9,481 | 11,354
Unpaid Contractual Principal Balance |  | 10,455 | 11,252 | 13,294
Specific Allowance |  | 146 | 0 | 65
Average Investment in Impaired Loans |  | 9,059 | 10,509 | 12,044
Interest Income Recognized | [1] | 546 | 539 | 632
Residential [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 318 |
Unpaid Contractual Principal Balance |  | 0 | 318 |
Average Investment in Impaired Loans |  | 106 | 534 |
Interest Income Recognized | [1] | 0 | 0 |
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 |
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 0 | 318 |
Unpaid Contractual Principal Balance |  | 0 | 318 |
Specific Allowance |  | 0 | 0 |
Average Investment in Impaired Loans |  | 106 | 534 |
Interest Income Recognized | [1] | 0 | 0 |
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,882 | 1,564 | 1,483
Unpaid Contractual Principal Balance |  | 1,882 | 1,570 | 1,483
Average Investment in Impaired Loans |  | 1,666 | 1,591 | 1,691
Interest Income Recognized | [1] | 41 | 36 | 52
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 1,882 | 1,564 | 1,483
Unpaid Contractual Principal Balance |  | 1,882 | 1,570 | 1,483
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,666 | 1,591 | 1,691
Interest Income Recognized | [1] | $ 41 | $ 36 | $ 52
[1] | Cash basis interest is substantially the same as interest income recognized.

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