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Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Allowance for Loan Losses [Roll Forward] |  |  |
Balance |  |  |
Portfolio loans, net |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 42,007 | $ 40,263 | $ 38,166
Provision (provision reversal) for loan losses | 2,332 | 2,385 | 1,871
Losses charged off | (2,595) | (1,027) | (1,035)
Recoveries | 148 | 386 | 1,261
Balance | 41,892 | 42,007 | 40,263
Portfolio loans, net | Commercial and industrial |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 29,424 | 27,410 | 26,406
Provision (provision reversal) for loan losses | 2,569 | 2,852 | 780
Losses charged off | (2,405) | (956) | (732)
Recoveries | 2 | 118 | 956
Balance | 29,590 | 29,424 | 27,410
Portfolio loans, net | CRE - investor owned |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 4,561 | 4,546 | 3,890
Provision (provision reversal) for loan losses | 3 | 5 | 648
Losses charged off | 0 | 0 | 0
Recoveries | 8 | 10 | 8
Balance | 4,572 | 4,561 | 4,546
Portfolio loans, net | CRE - owner occupied |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 3,845 | 3,502 | 3,308
Provision (provision reversal) for loan losses | (197) | 340 | 190
Losses charged off | (22) | 0 | 0
Recoveries | 4 | 3 | 4
Balance | 3,630 | 3,845 | 3,502
Portfolio loans, net | Construction and land development |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 1,690 | 1,728 | 1,487
Provision (provision reversal) for loan losses | 154 | (206) | 35
Losses charged off | 0 | 0 | 0
Recoveries | 21 | 168 | 206
Balance | 1,865 | 1,690 | 1,728
Portfolio loans, net | Residential real estate |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 1,763 | 2,315 | 2,237
Provision (provision reversal) for loan losses | (187) | (573) | 259
Losses charged off | (122) | (38) | (254)
Recoveries | 88 | 59 | 73
Balance | 1,542 | 1,763 | 2,315
Portfolio loans, net | Consumer and other |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2017 | 724 | 762 | 838
Provision (provision reversal) for loan losses | (10) | (33) | (41)
Losses charged off | (46) | (33) | (49)
Recoveries | 25 | 28 | 14
Balance | $ 693 | $ 724 | $ 762

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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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