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Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators - Schedule of Aging Analysis Past Due Loans and Leases, Loans Purchased and Non-Purchased by FDIC Loss Share Agreements (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 24,075 $ 31,485 $ 20,030
Current [1] 4,743,048 3,948,385 3,151,555
Total non-purchased loans and leases 4,767,123 3,979,870 3,171,585
Total Purchased Loans 1,826,848 1,147,947 1,404,069
Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 45,490 48,779 73,883
Current 1,781,358 1,099,168 1,330,186
Total Purchased Loans 1,826,848 1,147,947 1,404,069
Financing Receivables, 30-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 10,978 15,104 6,236
Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 26,044 20,006 17,684
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 13,097 16,381 13,794
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 19,446 28,773 56,199
Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Purchased Loans 1,761,553 1,050,792 1,243,603
Real Estate [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,673 7,888 4,411
Current [1] 312,563 275,365 262,086
Total non-purchased loans and leases 318,236 283,253 266,497
Total Purchased Loans 327,731 355,705 391,098
Real Estate [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,852 4,153 3,407
Current [1] 1,684,951 1,499,388 1,286,767
Total non-purchased loans and leases 1,688,803 1,503,541 1,290,174
Total Purchased Loans 1,162,105 504,889 613,470
Real Estate [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 10,025 16,401 10,109
Current [1] 1,890,000 1,395,437 1,039,049
Total non-purchased loans and leases 1,900,025 1,411,838 1,049,158
Total Purchased Loans 61,958 99,776 136,087
Real Estate [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,942 1,984 705
Current [1] 48,841 45,251 44,836
Total non-purchased loans and leases 50,783 47,235 45,541
Total Purchased Loans 29,619 47,988 60,631
Real Estate [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,042 0 491
Current [1] 295,832 211,156 136,462
Total non-purchased loans and leases 296,874 211,156 136,953
Total Purchased Loans 180,140 42,434 42,317
Real Estate [Member] | Purchased Loans [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 12,451 17,131 24,940
Current 315,280 338,574 366,158
Total Purchased Loans 327,731 355,705 391,098
Real Estate [Member] | Purchased Loans [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 25,928 21,346 30,499
Current 1,136,177 483,543 582,971
Total Purchased Loans 1,162,105 504,889 613,470
Real Estate [Member] | Purchased Loans [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,760 6,661 10,912
Current 58,198 93,115 125,175
Total Purchased Loans 61,958 99,776 136,087
Real Estate [Member] | Purchased Loans [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 457 1,112 2,425
Current 29,162 46,876 58,206
Total Purchased Loans 29,619 47,988 60,631
Real Estate [Member] | Purchased Loans [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,117 582 2,594
Current 179,023 41,852 39,723
Total Purchased Loans 180,140 42,434 42,317
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 4,642 6,352 2,890
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 2,672 2,708 1,714
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 906 3,520 49
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 516 1,680 269
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 1,042 0 491
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,476 8,088 10,866
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 16,737 8,907 4,929
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,045 1,197 1,146
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 291 237 165
Real Estate [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 408 515 0
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 1,031 1,536 1,521
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 1,180 1,445 1,693
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 9,119 12,881 10,060
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 1,426 304 436
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 0 0 0
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,975 9,043 14,074
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member] | Non-Farm/Non-Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 9,191 12,439 25,570
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member] | Construction/Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,715 5,464 9,766
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member] | Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 166 875 2,260
Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member] | Multi Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 709 67 2,594
Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 852 680 674
Current [1] 258,768 287,027 166,210
Total non-purchased loans and leases 259,620 287,707 166,884
Total Purchased Loans 46,624 68,825 113,273
Commercial And Industrial [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,547 1,614 2,125
Current 45,077 67,211 111,148
Total Purchased Loans 46,624 68,825 113,273
Commercial And Industrial [Member] | Financing Receivables, 30-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 737 586 674
Commercial And Industrial [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 936 863 392
Commercial And Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 115 94 0
Commercial And Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 611 751 1,733
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 260 216 193
Current [1] 25,272 25,453 28,481
Total non-purchased loans and leases 25,532 25,669 28,674
Total Purchased Loans 9,358 15,268 25,869
Consumer [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 179 302 353
Current 9,179 14,966 25,516
Total Purchased Loans 9,358 15,268 25,869
Consumer [Member] | Financing Receivables, 30-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 225 161 139
Consumer [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 111 199 170
Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 35 55 54
Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 68 103 183
Direct Financing Leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 246 93 40
Current [1] 136,900 115,382 98,728
Total non-purchased loans and leases 137,146 115,475 98,768
Direct Financing Leases [Member] | Financing Receivables, 30-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 140 39 10
Direct Financing Leases [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 106 54 30
Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 183 70 0
Current [1] 89,921 93,926 88,936
Total non-purchased loans and leases 90,104 93,996 88,936
Total Purchased Loans 9,313 13,062 21,324
Other [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 51 31 35
Current 9,262 13,031 21,289
Total Purchased Loans 9,313 13,062 21,324
Other [Member] | Financing Receivables, 30-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [2] 98 58 0
Other [Member] | Financing Receivables, 30-89 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 40 0 16
Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due [3] 85 12 0
Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Purchased Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 11 $ 31 $ 19
[1] Includes $2.5 million, $0.4 million and $2.8 million of loans and leases on nonaccrual status at June 30, 2015, December 31, 2014 and June 30, 2014, respectively
[2] Includes $0.7 million, $0.9 million and $1.8 million at June 30, 2015, December 31, 2014 and June 30, 2014, respectively, of loans and leases on nonaccrual status.
[3] All loans and leases greater than 90 days past due were on nonaccrual status at June 30, 2015 and 2014 and December 31, 2014.