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Purchased Loans - Fair Value of Loans Purchased (Details) - Purchased loans - USD ($) $ in Thousands | Sep. 30, 2017 | Jul. 01, 2017 | Dec. 31, 2016 | Apr. 01, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Accretable yield | $ (34,199) |  | $ (37,474) |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Contractually-required principal and interest | 340,513 |  |  |
Nonaccretable difference | (61,435) |  |  |
Cash flows expected to be collected | 279,078 |  |  |
Accretable yield | (34,199) |  |  |
Fair value | $ 244,879 |  |  |
KeyWorth Bank | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Contractually-required principal and interest |  |  |  | $ 289,495
Nonaccretable difference |  |  |  | (3,848)
Cash flows expected to be collected |  |  |  | 285,647
Accretable yield |  |  |  | (13,317)
Fair value |  |  |  | $ 272,330
Metropolitan Bancgroup, Inc. | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Contractually-required principal and interest |  | $ 1,198,132 |  |
Nonaccretable difference |  | (80,887) |  |
Cash flows expected to be collected |  | 1,117,245 |  |
Accretable yield |  | (152,821) |  |
Fair value |  | $ 964,424 |  |

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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating 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 No definition available. + Details
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