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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 200 |  |  | $ 200 |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Portfolio loans, net |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 2,332 | $ 2,385 | $ 1,871 |  |
Unpaid Contractual Principal Balance | 26,234 |  |  | 26,234 | $ 24,343
Recorded Investment With No Allowance | 7,182 |  |  | 7,182 | 4,856
Recorded Investment With Allowance | 9,862 |  |  | 9,862 | 10,831
Total Recorded Investment | 17,044 |  |  | 17,044 | 15,687
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,314 |  |  | 4,314 | 2,579
Impaired Financing Receivable, Related Allowance | 4,314 |  |  | 4,314 | 2,579
Average Recorded Investment |  |  |  | 14,889 | 19,722
Financing Receivable, Allowance for Credit Losses, Write-downs | (2,595) | (1,027) | (1,035) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 148 | 386 | 1,261 |  |
Financing Receivable, Allowance for Credit Losses | 41,892 | 42,007 | 40,263 | 41,892 | 38,166
Portfolio loans, net | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 2,569 | 2,852 | 780 |  |
Unpaid Contractual Principal Balance | 20,938 |  |  | 20,938 | 20,750
Recorded Investment With No Allowance | 3,266 |  |  | 3,266 | 2,321
Recorded Investment With Allowance | 8,931 |  |  | 8,931 | 10,344
Total Recorded Investment | 12,197 |  |  | 12,197 | 12,665
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,128 |  |  | 4,128 | 2,508
Impaired Financing Receivable, Related Allowance | 4,128 |  |  | 4,128 | 2,508
Average Recorded Investment |  |  |  | 10,414 | 16,270
Financing Receivable, Allowance for Credit Losses, Write-downs | (2,405) | (956) | (732) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 2 | 118 | 956 |  |
Financing Receivable, Allowance for Credit Losses | 29,590 | 29,424 | 27,410 | 29,590 | 26,406
Portfolio loans, net | Commercial - investor owned |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 3 | 5 | 648 |  |
Unpaid Contractual Principal Balance | 1,039 |  |  | 1,039 | 560
Recorded Investment With No Allowance | 770 |  |  | 770 | 422
Recorded Investment With Allowance | 0 |  |  | 0 | 0
Total Recorded Investment | 770 |  |  | 770 | 422
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  |  | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 |  |  | 0 | 0
Average Recorded Investment |  |  |  | 657 | 521
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 8 | 10 | 8 |  |
Financing Receivable, Allowance for Credit Losses | 4,572 | 4,561 | 4,546 | 4,572 | 3,890
Portfolio loans, net | Commercial - owner occupied |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | (197) | 340 | 190 |  |
Unpaid Contractual Principal Balance | 1,328 |  |  | 1,328 | 487
Recorded Investment With No Allowance | 826 |  |  | 826 | 0
Recorded Investment With Allowance | 462 |  |  | 462 | 487
Total Recorded Investment | 1,288 |  |  | 1,288 | 487
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 177 |  |  | 177 | 71
Impaired Financing Receivable, Related Allowance | 177 |  |  | 177 | 71
Average Recorded Investment |  |  |  | 1,074 | 490
Financing Receivable, Allowance for Credit Losses, Write-downs | (22) | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 4 | 3 | 4 |  |
Financing Receivable, Allowance for Credit Losses | 3,630 | 3,845 | 3,502 | 3,630 | 3,308
Portfolio loans, net | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 154 | (206) | 35 |  |
Unpaid Contractual Principal Balance | 0 |  |  | 0 | 441
Recorded Investment With No Allowance | 0 |  |  | 0 | 136
Recorded Investment With Allowance | 0 |  |  | 0 | 0
Total Recorded Investment | 0 |  |  | 0 | 136
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  |  | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 |  |  | 0 | 0
Average Recorded Investment |  |  |  | 0 | 331
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 21 | 168 | 206 |  |
Financing Receivable, Allowance for Credit Losses | 1,865 | 1,690 | 1,728 | 1,865 | 1,487
Portfolio loans, net | Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | (187) | (573) | 259 |  |
Unpaid Contractual Principal Balance | 2,600 |  |  | 2,600 | 1,730
Recorded Investment With No Allowance | 2,008 |  |  | 2,008 | 1,602
Recorded Investment With Allowance | 469 |  |  | 469 | 0
Total Recorded Investment | 2,477 |  |  | 2,477 | 1,602
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 9 |  |  | 9 | 0
Impaired Financing Receivable, Related Allowance | 9 |  |  | 9 | 0
Average Recorded Investment |  |  |  | 2,410 | 1,735
Financing Receivable, Allowance for Credit Losses, Write-downs | (122) | (38) | (254) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 88 | 59 | 73 |  |
Financing Receivable, Allowance for Credit Losses | 1,542 | 1,763 | 2,315 | 1,542 | 2,237
Portfolio loans, net | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | (10) | (33) | (41) |  |
Unpaid Contractual Principal Balance | 329 |  |  | 329 | 375
Recorded Investment With No Allowance | 312 |  |  | 312 | 375
Recorded Investment With Allowance | 0 |  |  | 0 | 0
Total Recorded Investment | 312 |  |  | 312 | 375
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  |  | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 |  |  | 0 | 0
Average Recorded Investment |  |  |  | 334 | 375
Financing Receivable, Allowance for Credit Losses, Write-downs | (46) | (33) | (49) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 25 | 28 | 14 |  |
Financing Receivable, Allowance for Credit Losses | $ 693 | $ 724 | $ 762 | $ 693 | $ 838

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