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Allowance for Loan Losses - Investment in Loans, Net of Unearned Income on Impairment Methodology (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | $ 25,206 | $ 30,307
Collectively evaluated for impairment | 7,458,554 | 7,362,755
Loans, net of unearned income | 7,698,070 | 7,620,322
Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | 214,310 | 227,260
Commercial, financial, agricultural |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 2,848 | 3,064
Collectively evaluated for impairment | 1,031,037 | 1,021,014
Loans, net of unearned income | 1,046,818 | 1,039,393
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | 12,933 | 15,315
Real estate – construction |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 399 | 1,777
Collectively evaluated for impairment | 657,092 | 631,612
Loans, net of unearned income | 657,491 | 633,389
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | 0 | 0
Real estate – 1-4 family mortgage |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 13,737 | 14,482
Collectively evaluated for impairment | 2,294,168 | 2,275,270
Loans, net of unearned income | 2,358,101 | 2,343,721
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | 50,196 | 53,969
Real estate – commercial mortgage |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 7,802 | 10,545
Collectively evaluated for impairment | 3,306,604 | 3,260,648
Loans, net of unearned income | 3,463,953 | 3,427,530
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | 149,547 | 156,337
Installment loans to individuals |  |
Investment in loans, net of unearned income on impairment methodology |  |
Individually evaluated for impairment | 420 | 439
Collectively evaluated for impairment | 169,653 | 174,211
Loans, net of unearned income | 171,707 | 176,289
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |
Investment in loans, net of unearned income on impairment methodology |  |
Purchased with deteriorated credit quality | $ 1,634 | $ 1,639

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- Definition Investment in loans, net of unearned income on impairment methodology. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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