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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 44,555 |  |  | $ 44,555 | $ 43,476
Portfolio loans, net |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 1,833 | $ 1,960 | $ 1,476 |  |
Unpaid Contractual Principal Balance | 29,179 |  |  | 29,179 | 26,047
Recorded Investment With No Allowance | 3,473 |  |  | 3,473 | 5,823
Recorded Investment With Allowance | 12,096 |  |  | 12,096 | 10,922
Total Recorded Investment | 15,569 |  |  | 15,569 | 16,745
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,408 |  |  | 2,408 | 4,453
Impaired Financing Receivable, Related Allowance | 2,408 |  |  | 2,408 | 4,453
Average Recorded Investment |  |  |  | 16,774 | 15,573
Financing Receivable, Allowance for Credit Loss, Writeoff | (1,658) | (1,890) | (2,250) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 588 | 920 | 424 |  |
Financing Receivable, Allowance for Credit Loss | 43,698 | 42,935 | 41,945 | 43,698 | 42,295
Portfolio loans, net | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 867 | 1,781 | 1,445 |  |
Unpaid Contractual Principal Balance | 24,233 |  |  | 24,233 | 21,893
Recorded Investment With No Allowance | 1,096 |  |  | 1,096 | 3,294
Recorded Investment With Allowance | 10,337 |  |  | 10,337 | 9,656
Total Recorded Investment | 11,433 |  |  | 11,433 | 12,950
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,023 |  |  | 2,023 | 4,266
Impaired Financing Receivable, Related Allowance | 2,023 |  |  | 2,023 | 4,266
Average Recorded Investment |  |  |  | 12,429 | 13,827
Financing Receivable, Allowance for Credit Loss, Writeoff | (1,295) | (1,380) | (1,853) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 209 | 32 | 29 |  |
Financing Receivable, Allowance for Credit Loss | 28,874 | 29,093 | 28,660 | 28,874 | 29,039
Portfolio loans, net | Commercial - investor owned |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 333 | 364 | 769 |  |
Unpaid Contractual Principal Balance | 3,312 |  |  | 3,312 | 553
Recorded Investment With No Allowance | 1,135 |  |  | 1,135 | 398
Recorded Investment With Allowance | 1,502 |  |  | 1,502 | 0
Total Recorded Investment | 2,637 |  |  | 2,637 | 398
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 258 |  |  | 258 | 0
Impaired Financing Receivable, Related Allowance | 258 |  |  | 258 | 0
Average Recorded Investment |  |  |  | 2,525 | 277
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | (431) | (120) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 11 | 52 | 7 |  |
Financing Receivable, Allowance for Credit Loss | 5,668 | 5,324 | 5,339 | 5,668 | 4,683
Portfolio loans, net | Commercial - owner occupied |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 419 | 591 | (431) |  |
Unpaid Contractual Principal Balance | 245 |  |  | 245 | 847
Recorded Investment With No Allowance | 221 |  |  | 221 | 472
Recorded Investment With Allowance | 0 |  |  | 0 | 336
Total Recorded Investment | 221 |  |  | 221 | 808
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  |  | 0 | 109
Impaired Financing Receivable, Related Allowance | 0 |  |  | 0 | 109
Average Recorded Investment |  |  |  | 27 | 691
Financing Receivable, Allowance for Credit Loss, Writeoff | (22) | 0 | (36) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 3 | 6 | 2 |  |
Financing Receivable, Allowance for Credit Loss | 4,771 | 4,371 | 3,774 | 4,771 | 4,239
Portfolio loans, net | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | (88) | (216) | (252) |  |
Unpaid Contractual Principal Balance | 0 |  |  | 0 | 0
Recorded Investment With No Allowance | 0 |  |  | 0 | 0
Recorded Investment With Allowance | 0 |  |  | 0 | 0
Total Recorded Investment | 0 |  |  | 0 | 0
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 | 0
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 | (45) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 260 | 489 | 9 |  |
Financing Receivable, Allowance for Credit Loss | 2,144 | 1,972 | 1,699 | 2,144 | 1,987
Portfolio loans, net | Residential real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 193 | (345) | (288) |  |
Unpaid Contractual Principal Balance | 1,388 |  |  | 1,388 | 2,425
Recorded Investment With No Allowance | 1,021 |  |  | 1,021 | 1,659
Recorded Investment With Allowance | 246 |  |  | 246 | 618
Total Recorded Investment | 1,267 |  |  | 1,267 | 2,277
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 116 |  |  | 116 | 52
Impaired Financing Receivable, Related Allowance | 116 |  |  | 116 | 52
Average Recorded Investment |  |  |  | 1,782 | 778
Financing Receivable, Allowance for Credit Loss, Writeoff | (255) | (26) | (67) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 65 | 124 | 364 |  |
Financing Receivable, Allowance for Credit Loss | 1,381 | 1,378 | 1,625 | 1,381 | 1,616
Portfolio loans, net | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 109 | (215) | 233 |  |
Unpaid Contractual Principal Balance | 1 |  |  | 1 | 329
Recorded Investment With No Allowance | 0 |  |  | 0 | 0
Recorded Investment With Allowance | 11 |  |  | 11 | 312
Total Recorded Investment | 11 |  |  | 11 | 312
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 11 |  |  | 11 | 26
Impaired Financing Receivable, Related Allowance | 11 |  |  | 11 | 26
Average Recorded Investment |  |  |  | 11 | 0
Financing Receivable, Allowance for Credit Loss, Writeoff | (86) | (53) | (129) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 40 | 217 | 13 |  |
Financing Receivable, Allowance for Credit Loss | $ 860 | $ 797 | $ 848 | $ 860 | $ 731

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