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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses | $ 43,095 | $ 43,476
Portfolio loans, net |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | 1,476 |
Unpaid Contractual Principal Balance | 11,963 | 26,047
Recorded Investment With No Allowance | 3,314 | 5,823
Recorded Investment With Allowance | 6,293 | 10,922
Total Recorded Investment | 9,607 | 16,745
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,914 | 4,453
Impaired Financing Receivable, Related Allowance | 2,795 | 4,453
Average Recorded Investment | 10,261 | 15,573
Financing Receivable, Allowance for Credit Losses, Write-downs | (2,250) |
Financing Receivable, Allowance for Credit Losses, Recovery | 424 |
Financing Receivable, Allowance for Credit Losses | 41,945 | 42,295
Portfolio loans, net | Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | 1,445 |
Unpaid Contractual Principal Balance | 9,515 | 21,893
Recorded Investment With No Allowance | 2,168 | 3,294
Recorded Investment With Allowance | 5,037 | 9,656
Total Recorded Investment | 7,205 | 12,950
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,199 | 4,266
Impaired Financing Receivable, Related Allowance | 2,199 | 4,266
Average Recorded Investment | 7,855 | 13,827
Financing Receivable, Allowance for Credit Losses, Write-downs | (1,853) |
Financing Receivable, Allowance for Credit Losses, Recovery | 29 |
Financing Receivable, Allowance for Credit Losses | 28,660 | 29,039
Portfolio loans, net | Commercial - investor owned |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | 769 |
Unpaid Contractual Principal Balance | 1,555 | 553
Recorded Investment With No Allowance | 271 | 398
Recorded Investment With Allowance | 1,256 | 0
Total Recorded Investment | 1,527 | 398
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 596 | 0
Impaired Financing Receivable, Related Allowance | 596 | 0
Average Recorded Investment | 1,527 | 277
Financing Receivable, Allowance for Credit Losses, Write-downs | (120) |
Financing Receivable, Allowance for Credit Losses, Recovery | 7 |
Financing Receivable, Allowance for Credit Losses | 5,339 | 4,683
Portfolio loans, net | Commercial - owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | (431) |
Unpaid Contractual Principal Balance | 484 | 847
Recorded Investment With No Allowance | 467 | 472
Recorded Investment With Allowance | 0 | 336
Total Recorded Investment | 467 | 808
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 119 | 109
Impaired Financing Receivable, Related Allowance | 0 | 109
Average Recorded Investment | 471 | 691
Financing Receivable, Allowance for Credit Losses, Write-downs | (36) |
Financing Receivable, Allowance for Credit Losses, Recovery | 2 |
Financing Receivable, Allowance for Credit Losses | 3,774 | 4,239
Portfolio loans, net | Construction and land development |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | (252) |
Unpaid Contractual Principal Balance | 0 | 0
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 0 | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0
Average Recorded Investment | 0 | 0
Financing Receivable, Allowance for Credit Losses, Write-downs | (45) |
Financing Receivable, Allowance for Credit Losses, Recovery | 9 |
Financing Receivable, Allowance for Credit Losses | 1,699 | 1,987
Portfolio loans, net | Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | (288) |
Unpaid Contractual Principal Balance | 409 | 2,425
Recorded Investment With No Allowance | 408 | 1,659
Recorded Investment With Allowance | 0 | 618
Total Recorded Investment | 408 | 2,277
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 52
Impaired Financing Receivable, Related Allowance | 0 | 52
Average Recorded Investment | 408 | 778
Financing Receivable, Allowance for Credit Losses, Write-downs | (67) |
Financing Receivable, Allowance for Credit Losses, Recovery | 364 |
Financing Receivable, Allowance for Credit Losses | 1,625 | 1,616
Portfolio loans, net | Consumer and other |  |
Financing Receivable, Impaired [Line Items] |  |
Provision for Loan, Lease, and Other Losses | 233 |
Unpaid Contractual Principal Balance | 0 | 329
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 0 | 312
Total Recorded Investment | 0 | 312
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 26
Impaired Financing Receivable, Related Allowance | 0 | 26
Average Recorded Investment | 0 | 0
Financing Receivable, Allowance for Credit Losses, Write-downs | (129) |
Financing Receivable, Allowance for Credit Losses, Recovery | 13 |
Financing Receivable, Allowance for Credit Losses | $ 848 | $ 731

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