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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 1,631 | $ 739 | $ 801
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 50,355 | 48,185 | 46,366
Unpaid Contractual Principal Balance |  | 54,879 | 53,132 | 50,956
Specific Allowance |  | 1,631 | 739 | 801
Average Investment in Impaired Loans |  | 51,120 | 48,800 | 47,097
Interest Income Recognized | [1] | 581 | 541 | 2,171
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 3,308 | 4,009 | 4,100
Unpaid Contractual Principal Balance |  | 3,308 | 4,009 | 4,100
Average Investment in Impaired Loans |  | 3,655 | 4,168 | 3,923
Interest Income Recognized | [1] | 46 | 37 | 171
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 324 |  | 127
Unpaid Contractual Principal Balance |  | 324 |  | 127
Specific Allowance |  | 164 | 0 | 50
Average Investment in Impaired Loans |  | 324 |  | 42
Interest Income Recognized | [1] | 3 |  | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 3,632 | 4,009 | 4,227
Unpaid Contractual Principal Balance |  | 3,632 | 4,009 | 4,227
Specific Allowance |  | 164 | 0 | 50
Average Investment in Impaired Loans |  | 3,979 | 4,168 | 3,965
Interest Income Recognized | [1] | 49 | 37 | 171
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 32,407 | 31,284 | 29,645
Unpaid Contractual Principal Balance |  | 34,098 | 33,377 | 31,409
Average Investment in Impaired Loans |  | 32,811 | 31,566 | 30,250
Interest Income Recognized | [1] | 347 | 352 | 1,412
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,922 | 2,105 | 1,854
Unpaid Contractual Principal Balance |  | 3,060 | 3,221 | 2,983
Specific Allowance |  | 847 | 739 | 605
Average Investment in Impaired Loans |  | 1,966 | 2,132 | 2,051
Interest Income Recognized | [1] | 10 | 0 | 1
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 34,329 | 33,389 | 31,499
Unpaid Contractual Principal Balance |  | 37,158 | 36,598 | 34,392
Specific Allowance |  | 847 | 739 | 605
Average Investment in Impaired Loans |  | 34,777 | 33,698 | 32,301
Interest Income Recognized | [1] | 357 | 352 | 1,413
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 8,903 | 9,183 | 8,285
Unpaid Contractual Principal Balance |  | 10,598 | 10,913 | 9,982
Average Investment in Impaired Loans |  | 8,866 | 9,332 | 8,774
Interest Income Recognized | [1] | 139 | 152 | 530
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,154 |  | 473
Unpaid Contractual Principal Balance |  | 1,154 |  | 473
Specific Allowance |  | 620 | 0 | 146
Average Investment in Impaired Loans |  | 1,169 |  | 285
Interest Income Recognized | [1] | 17 |  | 16
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 10,057 | 9,183 | 8,758
Unpaid Contractual Principal Balance |  | 11,752 | 10,913 | 10,455
Specific Allowance |  | 620 | 0 | 146
Average Investment in Impaired Loans |  | 10,035 | 9,332 | 9,059
Interest Income Recognized | [1] | 156 | 152 | 546
Residential [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 318 | 0
Unpaid Contractual Principal Balance |  | 0 | 318 | 0
Average Investment in Impaired Loans |  | 0 | 318 | 106
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 | 318 | 0
Unpaid Contractual Principal Balance |  | 0 | 318 | 0
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 0 | 318 | 106
Interest Income Recognized | [1] | 0 | 0 | 0
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 2,337 | 1,286 | 1,882
Unpaid Contractual Principal Balance |  | 2,337 | 1,294 | 1,882
Average Investment in Impaired Loans |  | 2,329 | 1,284 | 1,666
Interest Income Recognized | [1] | 19 | 0 | 41
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 2,337 | 1,286 | 1,882
Unpaid Contractual Principal Balance |  | 2,337 | 1,294 | 1,882
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 2,329 | 1,284 | 1,666
Interest Income Recognized | [1] | $ 19 | $ 0 | $ 41
[1] | Cash basis interest is substantially the same as interest income recognized.

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