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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 739 | $ 952 | $ 991
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 48,185 | 50,300 | 47,412
Unpaid Contractual Principal Balance |  | 53,132 | 53,798 | 52,212
Specific Allowance |  | 739 | 952 | 991
Average Investment in Impaired Loans |  | 48,800 | 50,828 | 49,343
Interest Income Recognized | [1] | 541 | 549 | 2,127
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,009 | 4,966 | 4,431
Unpaid Contractual Principal Balance |  | 4,009 | 4,968 | 4,439
Average Investment in Impaired Loans |  | 4,168 | 5,161 | 4,835
Interest Income Recognized | [1] | 37 | 37 | 200
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  |  | 153 | 153
Unpaid Contractual Principal Balance |  |  | 174 | 173
Specific Allowance |  | 0 | 25 | 25
Average Investment in Impaired Loans |  |  | 161 | 155
Interest Income Recognized | [1] |  | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 4,009 | 5,119 | 4,584
Unpaid Contractual Principal Balance |  | 4,009 | 5,142 | 4,612
Specific Allowance |  | 0 | 25 | 25
Average Investment in Impaired Loans |  | 4,168 | 5,322 | 4,990
Interest Income Recognized | [1] | 37 | 37 | 200
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 31,284 | 28,493 | 28,480
Unpaid Contractual Principal Balance |  | 33,377 | 28,956 | 30,365
Average Investment in Impaired Loans |  | 31,566 | 28,645 | 27,753
Interest Income Recognized | [1] | 352 | 361 | 1,344
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 2,105 | 3,959 | 2,985
Unpaid Contractual Principal Balance |  | 3,221 | 5,051 | 4,095
Specific Allowance |  | 739 | 927 | 966
Average Investment in Impaired Loans |  | 2,132 | 3,978 | 3,932
Interest Income Recognized | [1] | 0 | 0 | 8
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 33,389 | 32,452 | 31,465
Unpaid Contractual Principal Balance |  | 36,598 | 34,007 | 34,460
Specific Allowance |  | 739 | 927 | 966
Average Investment in Impaired Loans |  | 33,698 | 32,623 | 31,685
Interest Income Recognized | [1] | 352 | 361 | 1,352
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  |  |  | 0
Unpaid Contractual Principal Balance |  |  |  | 0
Average Investment in Impaired Loans |  |  |  | 34
Interest Income Recognized | [1] |  |  | 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 |  |  |  | 34
Interest Income Recognized | [1] |  |  | 0
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 9,183 | 10,927 | 9,481
Unpaid Contractual Principal Balance |  | 10,913 | 12,847 | 11,252
Average Investment in Impaired Loans |  | 9,332 | 11,079 | 10,444
Interest Income Recognized | [1] | 152 | 140 | 539
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  |  | 0 | 0
Unpaid Contractual Principal Balance |  |  | 0 | 0
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  |  | 0 | 65
Interest Income Recognized | [1] |  | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 9,183 | 10,927 | 9,481
Unpaid Contractual Principal Balance |  | 10,913 | 12,847 | 11,252
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 9,332 | 11,079 | 10,509
Interest Income Recognized | [1] | 152 | 140 | 539
Residential [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 318 |  | 318
Unpaid Contractual Principal Balance |  | 318 |  | 318
Average Investment in Impaired Loans |  | 318 |  | 534
Interest Income Recognized | [1] | 0 |  | 0
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 |  | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 318 |  | 318
Unpaid Contractual Principal Balance |  | 318 |  | 318
Specific Allowance |  | 0 |  | 0
Average Investment in Impaired Loans |  | 318 |  | 534
Interest Income Recognized | [1] | 0 |  | 0
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,286 | 1,802 | 1,564
Unpaid Contractual Principal Balance |  | 1,294 | 1,802 | 1,570
Average Investment in Impaired Loans |  | 1,284 | 1,804 | 1,591
Interest Income Recognized | [1] | 0 | 11 | 36
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 1,286 | 1,802 | 1,564
Unpaid Contractual Principal Balance |  | 1,294 | 1,802 | 1,570
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,284 | 1,804 | 1,591
Interest Income Recognized | [1] | $ 0 | $ 11 | $ 36
[1] | Cash basis interest is substantially the same as interest income recognized.

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