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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 907 | $ 1,319 | $ 907 | $ 1,319 | $ 991
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 46,743 | 50,729 | 46,743 | 50,729 | 47,412
Unpaid Contractual Principal Balance |  | 51,443 | 54,443 | 51,443 | 54,443 | 52,212
Specific Allowance |  | 907 | 1,319 | 907 | 1,319 | 991
Average Investment in Impaired Loans |  | 47,198 | 51,594 | 48,001 | 51,214 | 49,343
Interest Income Recognized | [1] | 585 | 541 | 1,126 | 1,090 | 2,127
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,299 | 4,707 | 4,299 | 4,707 | 4,431
Unpaid Contractual Principal Balance |  | 4,299 | 4,709 | 4,299 | 4,709 | 4,439
Average Investment in Impaired Loans |  | 4,353 | 5,041 | 4,261 | 5,101 | 4,835
Interest Income Recognized | [1] | 69 | 49 | 106 | 86 | 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 |  | 157 | 155
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 4,299 | 4,860 | 4,299 | 4,860 | 4,584
Unpaid Contractual Principal Balance |  | 4,299 | 4,883 | 4,299 | 4,883 | 4,612
Specific Allowance |  | 0 | 25 | 0 | 25 | 25
Average Investment in Impaired Loans |  | 4,353 | 5,194 | 4,261 | 5,258 | 4,990
Interest Income Recognized | [1] | 69 | 49 | 106 | 86 | 200
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 29,718 | 27,509 | 29,718 | 27,509 | 28,480
Unpaid Contractual Principal Balance |  | 31,653 | 28,195 | 31,653 | 28,195 | 30,365
Average Investment in Impaired Loans |  | 29,982 | 27,858 | 30,774 | 28,252 | 27,753
Interest Income Recognized | [1] | 372 | 343 | 724 | 704 | 1,344
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 2,156 | 4,731 | 2,156 | 4,731 | 2,985
Unpaid Contractual Principal Balance |  | 3,277 | 5,833 | 3,277 | 5,833 | 4,095
Specific Allowance |  | 807 | 1,227 | 807 | 1,227 | 966
Average Investment in Impaired Loans |  | 2,199 | 4,745 | 2,166 | 4,362 | 3,932
Interest Income Recognized | [1] | 1 | 5 | 1 | 5 | 8
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 31,874 | 32,240 | 31,874 | 32,240 | 31,465
Unpaid Contractual Principal Balance |  | 34,930 | 34,028 | 34,930 | 34,028 | 34,460
Specific Allowance |  | 807 | 1,227 | 807 | 1,227 | 966
Average Investment in Impaired Loans |  | 32,181 | 32,603 | 32,940 | 32,614 | 31,685
Interest Income Recognized | [1] | 373 | 348 | 725 | 709 | 1,352
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  | 130 |  | 130 | 0
Unpaid Contractual Principal Balance |  |  | 130 |  | 130 | 0
Average Investment in Impaired Loans |  |  | 135 |  | 68 | 34
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 |  |  | 130 |  | 130 | 0
Unpaid Contractual Principal Balance |  |  | 130 |  | 130 | 0
Specific Allowance |  |  | 0 |  | 0 | 0
Average Investment in Impaired Loans |  |  | 135 |  | 68 | 34
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 8,606 | 10,719 | 8,606 | 10,719 | 9,481
Unpaid Contractual Principal Balance |  | 10,250 | 12,619 | 10,250 | 12,619 | 11,252
Average Investment in Impaired Loans |  | 8,722 | 10,882 | 9,027 | 10,981 | 10,444
Interest Income Recognized | [1] | 128 | 133 | 280 | 273 | 539
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 343 | 131 | 343 | 131 | 0
Unpaid Contractual Principal Balance |  | 343 | 134 | 343 | 134 | 0
Specific Allowance |  | 100 | 67 | 100 | 67 | 0
Average Investment in Impaired Loans |  | 321 | 131 | 161 | 66 | 65
Interest Income Recognized | [1] | 4 | 0 | 4 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 8,949 | 10,850 | 8,949 | 10,850 | 9,481
Unpaid Contractual Principal Balance |  | 10,593 | 12,753 | 10,593 | 12,753 | 11,252
Specific Allowance |  | 100 | 67 | 100 | 67 | 0
Average Investment in Impaired Loans |  | 9,043 | 11,013 | 9,188 | 11,047 | 10,509
Interest Income Recognized | [1] | 132 | 133 | 284 | 273 | 539
Residential [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  | 846 |  | 846 | 318
Unpaid Contractual Principal Balance |  |  | 846 |  | 846 | 318
Average Investment in Impaired Loans |  | 0 | 846 | 159 | 423 | 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 |  |  | 846 |  | 846 | 318
Unpaid Contractual Principal Balance |  |  | 846 |  | 846 | 318
Specific Allowance |  |  | 0 |  | 0 | 0
Average Investment in Impaired Loans |  | 0 | 846 | 159 | 423 | 534
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,621 | 1,803 | 1,621 | 1,803 | 1,564
Unpaid Contractual Principal Balance |  | 1,621 | 1,803 | 1,621 | 1,803 | 1,570
Average Investment in Impaired Loans |  | 1,621 | 1,803 | 1,453 | 1,804 | 1,591
Interest Income Recognized | [1] | 11 | 11 | 11 | 22 | 36
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,621 | 1,803 | 1,621 | 1,803 | 1,564
Unpaid Contractual Principal Balance |  | 1,621 | 1,803 | 1,621 | 1,803 | 1,570
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,621 | 1,803 | 1,453 | 1,804 | 1,591
Interest Income Recognized | [1] | $ 11 | $ 11 | $ 11 | $ 22 | $ 36
[1] | Cash basis interest is substantially the same as interest income recognized.

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