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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 900 |  | $ 900 |
Portfolio loans, net |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (2,385) | $ (1,871) |  |
Unpaid Contractual Principal Balance | 24,834 |  | 24,834 | $ 24,343
Recorded Investment With No Allowance | 4,991 |  | 4,991 | 4,856
Recorded Investment With Allowance | 9,810 |  | 9,810 | 10,831
Total Recorded Investment | 14,801 |  | 14,801 | 15,687
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,886 |  | 3,886 | 2,579
Impaired Financing Receivable, Related Allowance | 3,886 |  | 3,886 | 2,579
Average Recorded Investment |  |  | 16,271 | 19,722
Financing Receivable, Allowance for Credit Losses, Write-downs | (1,027) | (1,035) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 386 | 1,261 |  |
Financing Receivable, Allowance for Credit Losses | 42,007 | 40,263 | 42,007 | 38,166
Portfolio loans, net | Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (2,852) | (780) |  |
Unpaid Contractual Principal Balance | 20,915 |  | 20,915 | 20,750
Recorded Investment With No Allowance | 1,900 |  | 1,900 | 2,321
Recorded Investment With Allowance | 9,326 |  | 9,326 | 10,344
Total Recorded Investment | 11,226 |  | 11,226 | 12,665
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,667 |  | 3,667 | 2,508
Impaired Financing Receivable, Related Allowance | 3,667 |  | 3,667 | 2,508
Average Recorded Investment |  |  | 12,591 | 16,270
Financing Receivable, Allowance for Credit Losses, Write-downs | (956) | (732) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 118 | 956 |  |
Financing Receivable, Allowance for Credit Losses | 29,424 | 27,410 | 29,424 | 26,406
Portfolio loans, net | Commercial - investor owned |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (5) | (648) |  |
Unpaid Contractual Principal Balance | 557 |  | 557 | 560
Recorded Investment With No Allowance | 410 |  | 410 | 422
Recorded Investment With Allowance | 0 |  | 0 | 0
Total Recorded Investment | 410 |  | 410 | 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 |  |  | 415 | 521
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 10 | 8 |  |
Financing Receivable, Allowance for Credit Losses | 4,561 | 4,546 | 4,561 | 3,890
Portfolio loans, net | Commercial - owner occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (340) | (190) |  |
Unpaid Contractual Principal Balance | 751 |  | 751 | 487
Recorded Investment With No Allowance | 259 |  | 259 | 0
Recorded Investment With Allowance | 484 |  | 484 | 487
Total Recorded Investment | 743 |  | 743 | 487
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 219 |  | 219 | 71
Impaired Financing Receivable, Related Allowance | 219 |  | 219 | 71
Average Recorded Investment |  |  | 750 | 490
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 3 | 4 |  |
Financing Receivable, Allowance for Credit Losses | 3,845 | 3,502 | 3,845 | 3,308
Portfolio loans, net | Construction and land development |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | 206 | (35) |  |
Unpaid Contractual Principal Balance | 444 |  | 444 | 441
Recorded Investment With No Allowance | 435 |  | 435 | 136
Recorded Investment With Allowance | 0 |  | 0 | 0
Total Recorded Investment | 435 |  | 435 | 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 |  |  | 494 | 331
Financing Receivable, Allowance for Credit Losses, Write-downs | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 168 | 206 |  |
Financing Receivable, Allowance for Credit Losses | 1,690 | 1,728 | 1,690 | 1,487
Portfolio loans, net | Residential real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | 573 | (259) |  |
Unpaid Contractual Principal Balance | 1,835 |  | 1,835 | 1,730
Recorded Investment With No Allowance | 1,669 |  | 1,669 | 1,602
Recorded Investment With Allowance | 0 |  | 0 | 0
Total Recorded Investment | 1,669 |  | 1,669 | 1,602
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 |  | 0 | 0
Average Recorded Investment |  |  | 1,688 | 1,735
Financing Receivable, Allowance for Credit Losses, Write-downs | (38) | (254) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 59 | 73 |  |
Financing Receivable, Allowance for Credit Losses | 1,763 | 2,315 | 1,763 | 2,237
Portfolio loans, net | Consumer and other |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | 33 | 41 |  |
Unpaid Contractual Principal Balance | 332 |  | 332 | 375
Recorded Investment With No Allowance | 318 |  | 318 | 375
Recorded Investment With Allowance | 0 |  | 0 | 0
Total Recorded Investment | 318 |  | 318 | 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 |  |  | 333 | 375
Financing Receivable, Allowance for Credit Losses, Write-downs | (33) | (49) |  |
Financing Receivable, Allowance for Credit Losses, Recovery | 28 | 14 |  |
Financing Receivable, Allowance for Credit Losses | $ 724 | $ 762 | $ 724 | $ 838

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