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Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | $ 37,565 | $ 33,441 | $ 30,185
Provision (provision reversal) | 10,764 | 5,551 | 4,872
Losses charged off | (11,507) | (4,335) | (6,091)
Recoveries | 1,344 | 2,908 | 4,475
Balance, end of year | 38,166 | 37,565 | 33,441
Commercial and industrial |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 26,996 | 22,056 | 16,983
Provision (provision reversal) | 8,737 | 6,569 | 6,976
Losses charged off | (9,872) | (2,303) | (3,699)
Recoveries | 545 | 674 | 1,796
Balance, end of year | 26,406 | 26,996 | 22,056
CRE - investor owned |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 3,420 | 3,484 | 4,382
Provision (provision reversal) | 456 | (11) | (303)
Losses charged off | (117) | (95) | (664)
Recoveries | 131 | 42 | 69
Balance, end of year | 3,890 | 3,420 | 3,484
CRE - owner occupied |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 2,890 | 2,969 | 3,135
Provision (provision reversal) | 404 | (1,202) | (1,626)
Losses charged off | (90) | 0 | (38)
Recoveries | 104 | 1,123 | 1,498
Balance, end of year | 3,308 | 2,890 | 2,969
Construction and land development |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 1,304 | 1,704 | 1,715
Provision (provision reversal) | 336 | (1,334) | (335)
Losses charged off | (254) | 0 | (350)
Recoveries | 101 | 934 | 674
Balance, end of year | 1,487 | 1,304 | 1,704
Residential real estate |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 2,023 | 1,796 | 2,830
Provision (provision reversal) | 797 | 129 | (58)
Losses charged off | (973) | (25) | (1,313)
Recoveries | 390 | 123 | 337
Balance, end of year | 2,237 | 2,023 | 1,796
Consumer and other |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance, beginning of year | 932 | 1,432 | 1,140
Provision (provision reversal) | 34 | 1,400 | 218
Losses charged off | (201) | (1,912) | (27)
Recoveries | 73 | 12 | 101
Balance, end of year | $ 838 | $ 932 | $ 1,432

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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