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Loans - Summary of Impaired Financial Receivables (Analysis of Covered Impaired Loans) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance $ 3,458,495 $ 2,835,399 $ 2,803,440 $ 3,458,495 $ 2,803,440 $ 2,835,399
Commercial, Financial & Agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 373,202 319,654 304,588 373,202 304,588 319,654
Real Estate - Construction & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 205,019 161,507 149,346 205,019 149,346 161,507
Real Estate - Commercial & Farmland [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 1,010,195 907,524 850,000 1,010,195 850,000 907,524
Real Estate - Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 537,201 456,106 422,731 537,201 422,731 456,106
Covered Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 99,932 95,967 77,392 99,932 77,392 95,967
Recorded Investment With No Allowance 46,371 58,031 67,241 46,371 67,241 58,031
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 46,371 58,031 67,241 46,371 67,241 58,031
Related Allowance 0 0 0 0 0 0
Average Recorded Investment 55,179 60,036 74,899 56,129 80,397 72,253
Covered Loans [Member] | Commercial, Financial & Agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 14,260 14,385 14,694 14,260 14,694 14,385
Recorded Investment With No Allowance 7,951 8,582 12,266 7,951 12,266 8,582
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 7,951 8,582 12,266 7,951 12,266 8,582
Related Allowance 0 0 0 0 0 0
Average Recorded Investment 8,869 8,525 11,153 8,773 9,858 9,325
Covered Loans [Member] | Real Estate - Construction & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 29,895 27,289 12,921 29,895 12,921 27,289
Recorded Investment With No Allowance 5,953 10,638 11,048 5,953 11,048 10,638
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 5,953 10,638 11,048 5,953 11,048 10,638
Related Allowance 0 0 0 0 0 0
Average Recorded Investment 7,819 11,279 14,541 8,757 15,706 13,935
Covered Loans [Member] | Real Estate - Commercial & Farmland [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 37,426 31,309 27,742 37,426 27,742 31,309
Recorded Investment With No Allowance 17,970 20,663 24,007 17,970 24,007 20,663
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 17,970 20,663 24,007 17,970 24,007 20,663
Related Allowance 0 0 0 0 0 0
Average Recorded Investment 21,795 21,890 27,877 21,418 32,167 28,057
Covered Loans [Member] | Real Estate - Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 18,226 22,860 21,874 18,226 21,874 22,860
Recorded Investment With No Allowance 14,402 18,054 19,793 14,402 19,793 18,054
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 14,402 18,054 19,793 14,402 19,793 18,054
Related Allowance 0 0 0 0 0 0
Average Recorded Investment 16,600 18,242 21,199 17,084 22,465 20,776
Covered Loans [Member] | Consumer Installment Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid Contractual Principal Balance 125 124 161 125 161 124
Recorded Investment With No Allowance 95 94 127 95 127 94
Recorded Investment With Allowance 0 0 0 0 0 0
Total Recorded Investment 95 94 127 95 127 94
Related Allowance 0 0 0 0 0 0
Average Recorded Investment $ 99 $ 100 $ 130 $ 97 $ 200 $ 160