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Loans and Allowance for Loan and Lease Losses - Schedule of Outstanding Contractually Required Principal and Interest and Carrying Amount of PCI Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Accounts Notes And Loans Receivable [Line Items] |  |
Outstanding contractually required principal and interest | $ 27,018 | $ 19,861
Loans | 3,512,143 | 2,810,856
Real Estate Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Outstanding contractually required principal and interest | 22,877 | 16,360
Commercial Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Outstanding contractually required principal and interest | 4,141 | 3,501
Loans | 1,123,598 | 920,812
Purchased Credit Impaired Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans | 20,278 | 15,598
Purchased Credit Impaired Loans | Commercial Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans | $ 1,609 | $ 687

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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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