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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 875 | $ 907 | $ 875 | $ 907 | $ 801
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 54,593 | 46,743 | 54,593 | 46,743 | 46,366
Unpaid Contractual Principal Balance |  | 60,105 | 51,443 | 60,105 | 51,443 | 50,956
Specific Allowance |  | 875 | 907 | 875 | 907 | 801
Average Investment in Impaired Loans |  | 55,813 | 47,198 | 53,468 | 48,001 | 47,097
Interest Income Recognized | [1] | 637 | 585 | 1,218 | 1,126 | 2,171
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 3,313 | 4,299 | 3,313 | 4,299 | 4,100
Unpaid Contractual Principal Balance |  | 3,383 | 4,299 | 3,383 | 4,299 | 4,100
Average Investment in Impaired Loans |  | 3,419 | 4,353 | 3,537 | 4,261 | 3,923
Interest Income Recognized | [1] | 49 | 69 | 95 | 106 | 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 |  | 189 |  | 257 |  | 42
Interest Income Recognized | [1] | 3 |  | 6 |  | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 3,487 | 4,299 | 3,487 | 4,299 | 4,227
Unpaid Contractual Principal Balance |  | 3,557 | 4,299 | 3,557 | 4,299 | 4,227
Specific Allowance |  | 99 | 0 | 99 | 0 | 50
Average Investment in Impaired Loans |  | 3,608 | 4,353 | 3,794 | 4,261 | 3,965
Interest Income Recognized | [1] | 52 | 69 | 101 | 106 | 171
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 35,043 | 29,718 | 35,043 | 29,718 | 29,645
Unpaid Contractual Principal Balance |  | 36,740 | 31,653 | 36,740 | 31,653 | 31,409
Average Investment in Impaired Loans |  | 35,259 | 29,982 | 34,035 | 30,774 | 30,250
Interest Income Recognized | [1] | 403 | 372 | 750 | 724 | 1,412
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,985 | 2,156 | 1,985 | 2,156 | 1,854
Unpaid Contractual Principal Balance |  | 3,473 | 3,277 | 3,473 | 3,277 | 2,983
Specific Allowance |  | 594 | 807 | 594 | 807 | 605
Average Investment in Impaired Loans |  | 2,314 | 2,199 | 2,140 | 2,166 | 2,051
Interest Income Recognized | [1] | 5 | 1 | 15 | 1 | 1
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 37,028 | 31,874 | 37,028 | 31,874 | 31,499
Unpaid Contractual Principal Balance |  | 40,213 | 34,930 | 40,213 | 34,930 | 34,392
Specific Allowance |  | 594 | 807 | 594 | 807 | 605
Average Investment in Impaired Loans |  | 37,573 | 32,181 | 36,175 | 32,940 | 32,301
Interest Income Recognized | [1] | 408 | 373 | 765 | 725 | 1,413
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 10,992 | 8,606 | 10,992 | 8,606 | 8,285
Unpaid Contractual Principal Balance |  | 13,249 | 10,250 | 13,249 | 10,250 | 9,982
Average Investment in Impaired Loans |  | 11,546 | 8,722 | 10,206 | 9,027 | 8,774
Interest Income Recognized | [1] | 149 | 128 | 288 | 280 | 530
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 516 | 343 | 516 | 343 | 473
Unpaid Contractual Principal Balance |  | 516 | 343 | 516 | 343 | 473
Specific Allowance |  | 182 | 100 | 182 | 100 | 146
Average Investment in Impaired Loans |  | 514 | 321 | 842 | 161 | 285
Interest Income Recognized | [1] | 6 | 4 | 23 | 4 | 16
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 11,508 | 8,949 | 11,508 | 8,949 | 8,758
Unpaid Contractual Principal Balance |  | 13,765 | 10,593 | 13,765 | 10,593 | 10,455
Specific Allowance |  | 182 | 100 | 182 | 100 | 146
Average Investment in Impaired Loans |  | 12,060 | 9,043 | 11,048 | 9,188 | 9,059
Interest Income Recognized | [1] | 155 | 132 | 311 | 284 | 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 |  | 159 | 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 |  | 159 | 106
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 2,570 | 1,621 | 2,570 | 1,621 | 1,882
Unpaid Contractual Principal Balance |  | 2,570 | 1,621 | 2,570 | 1,621 | 1,882
Average Investment in Impaired Loans |  | 2,572 | 1,621 | 2,451 | 1,453 | 1,666
Interest Income Recognized | [1] | 22 | 11 | 41 | 11 | 41
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 2,570 | 1,621 | 2,570 | 1,621 | 1,882
Unpaid Contractual Principal Balance |  | 2,570 | 1,621 | 2,570 | 1,621 | 1,882
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 2,572 | 1,621 | 2,451 | 1,453 | 1,666
Interest Income Recognized | [1] | $ 22 | $ 11 | $ 41 | $ 11 | $ 41
[1] | Cash basis interest is substantially the same as interest income recognized.

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