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Loans and Allowance for Loan and Lease Losses - Schedule of Recorded Investment and Unpaid Principal for Impaired Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | $ 2,810,856 | $ 2,027,624 |  |
Unpaid Principal | 2,832,506 | 2,045,606 |  |
Difference | (21,650) | (17,982) |  |
Allowance for loan and lease losses | (18,748) | (15,405) | $ (12,567) | $ (8,843)
Loans, net | 2,792,108 | 2,012,219 |  |
Commercial real estate |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 745,893 | 442,237 |  |
Unpaid Principal | 753,803 | 447,926 |  |
Difference | (7,910) | (5,689) |  |
Allowance for loan and lease losses | (3,435) | (1,813) | (1,489) | (533)
Construction, land development, land |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 134,812 | 109,812 |  |
Unpaid Principal | 138,045 | 113,211 |  |
Difference | (3,233) | (3,399) |  |
Allowance for loan and lease losses | (883) | (465) | (367) | (333)
1-4 family residential properties |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 125,827 | 104,974 |  |
Unpaid Principal | 127,499 | 106,852 |  |
Difference | (1,672) | (1,878) |  |
Allowance for loan and lease losses | (293) | (253) | (274) | (215)
Farmland |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 180,141 | 141,615 |  |
Unpaid Principal | 184,006 | 142,673 |  |
Difference | (3,865) | (1,058) |  |
Allowance for loan and lease losses | (310) | (170) | (134) | (19)
Commercial Loans |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 920,812 | 778,643 |  |
Unpaid Principal | 924,133 | 783,349 |  |
Difference | (3,321) | (4,706) |  |
Allowance for loan and lease losses | (8,150) | (8,014) | (5,276) | (4,003)
Factored receivables |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 374,410 | 238,198 |  |
Unpaid Principal | 376,046 | 239,432 |  |
Difference | (1,636) | (1,234) |  |
Allowance for loan and lease losses | (4,597) | (4,088) | (4,509) | (3,462)
Consumer |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 31,131 | 29,764 |  |
Unpaid Principal | 31,144 | 29,782 |  |
Difference | (13) | (18) |  |
Allowance for loan and lease losses | (783) | (420) | (216) | (140)
Mortgage warehouse |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan, Total | 297,830 | 182,381 |  |
Unpaid Principal | 297,830 | 182,381 |  |
Allowance for loan and lease losses | $ (297) | $ (182) | $ (302) | $ (138)

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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