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Acquired Loans - Acquired Loans by Loan Type and Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans $ 105,701 $ 257,438
Acquired Loans, Aging [Abstract]    
Current 104,377 255,506
Acquired Loans, Past Due 2,555 5,707
Nonaccrual [1] 0 304
Total Acquired Loans 106,932 261,517
Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 1,546 2,434
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 5,786 22,601
Acquired Loans, Past Due 92 985
Nonaccrual [1] 0 0
Total Acquired Loans 5,878 23,586
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 87 861
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 21,303 58,490
Acquired Loans, Past Due 1,253 2,959
Nonaccrual [1] 0 302
Total Acquired Loans 22,556 61,751
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 481 654
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 46,795 113,256
Acquired Loans, Past Due 1,184 1,438
Nonaccrual [1] 0 0
Total Acquired Loans 47,979 114,694
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 978 898
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 8,237 16,614
Acquired Loans, Past Due 16 132
Nonaccrual [1] 0 0
Total Acquired Loans 8,253 16,746
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 0 0
Commercial and Industrial Loans [Member]    
Acquired Loans, Aging [Abstract]    
Current 15,267 31,504
Acquired Loans, Past Due 0 0
Nonaccrual [1] 0 2
Total Acquired Loans 15,267 31,506
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 0 0
Consumer Loans [Member]    
Acquired Loans, Aging [Abstract]    
Current 1,346 2,428
Acquired Loans, Past Due 10 172
Nonaccrual [1] 0 0
Total Acquired Loans 1,356 2,600
Consumer Loans [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 0 0
Other Loans [Member]    
Acquired Loans, Aging [Abstract]    
Current 5,643 10,613
Acquired Loans, Past Due 0 21
Nonaccrual [1] 0 0
Total Acquired Loans 5,643 10,634
Other Loans [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due [2] 0 21
Commercial LHFI [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 87,740 212,826
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 5,227 22,338
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 5,371 17,348
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 47,979 114,660
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 8,253 16,340
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 15,267 31,506
Commercial LHFI [Member] | Other Loans [Member] | Commercial Loan [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 5,643 10,634
Commercial LHFI [Member] | Pass [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 62,437 167,079
Commercial LHFI [Member] | Pass [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 4,923 17,150
Commercial LHFI [Member] | Pass [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 4,341 14,021
Commercial LHFI [Member] | Pass [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 34,933 95,147
Commercial LHFI [Member] | Pass [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 7,653 12,730
Commercial LHFI [Member] | Pass [Member] | Commercial and Industrial Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 6,560 22,157
Commercial LHFI [Member] | Pass [Member] | Other Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 4,027 5,874
Commercial LHFI [Member] | Special Mention [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 71 2,067
Commercial LHFI [Member] | Special Mention [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 26 234
Commercial LHFI [Member] | Special Mention [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 45 298
Commercial LHFI [Member] | Special Mention [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans   1,400
Commercial LHFI [Member] | Special Mention [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans   102
Commercial LHFI [Member] | Special Mention [Member] | Commercial and Industrial Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans   15
Commercial LHFI [Member] | Special Mention [Member] | Other Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans   18
Commercial LHFI [Member] | Substandard [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 22,174 40,660
Commercial LHFI [Member] | Substandard [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 278 4,690
Commercial LHFI [Member] | Substandard [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 534 3,029
Commercial LHFI [Member] | Substandard [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 12,614 17,583
Commercial LHFI [Member] | Substandard [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 190 3,031
Commercial LHFI [Member] | Substandard [Member] | Commercial and Industrial Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 6,942 7,585
Commercial LHFI [Member] | Substandard [Member] | Other Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 1,616 4,742
Commercial LHFI [Member] | Doubtful [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 3,058 3,020
Commercial LHFI [Member] | Doubtful [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans   264
Commercial LHFI [Member] | Doubtful [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 451  
Commercial LHFI [Member] | Doubtful [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 432 530
Commercial LHFI [Member] | Doubtful [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 410 477
Commercial LHFI [Member] | Doubtful [Member] | Commercial and Industrial Loans [Member]    
Acquired Loans, Commercial Loans [Abstract]    
Acquired loans 1,765 1,749
Consumer LHFI [Member]    
Acquired Loans, Aging [Abstract]    
Current 18,121 46,064
Nonaccrual [1]   124
Subtotal 19,192 48,691
Total Acquired Loans 106,932 261,517
Consumer LHFI [Member] | Past Due 30-89 Days [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 586 1,905
Consumer LHFI [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 485 598
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 642 1,188
Subtotal 651 1,248
Total Acquired Loans 5,878 23,586
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 5 46
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 4 14
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current 16,133 42,008
Nonaccrual [1]   124
Subtotal 17,185 44,403
Total Acquired Loans 22,556 61,751
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 571 1,687
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 481 584
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current   34
Subtotal   34
Total Acquired Loans 47,979 114,694
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Acquired Loans, Aging [Abstract]    
Current   406
Subtotal   406
Total Acquired Loans 8,253 16,746
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]    
Acquired Loans, Aging [Abstract]    
Total Acquired Loans 15,267 31,506
Consumer LHFI [Member] | Consumer Loans [Member]    
Acquired Loans, Aging [Abstract]    
Current 1,346 2,428
Subtotal 1,356 2,600
Total Acquired Loans 1,356 2,600
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]    
Acquired Loans, Aging [Abstract]    
Acquired Loans, Past Due 10 172
Consumer LHFI [Member] | Other Loans [Member]    
Acquired Loans, Aging [Abstract]    
Total Acquired Loans $ 5,643 $ 10,634
[1] Acquired loans not accounted for under FASB ASC Topic 310-30.
[2] Past due 90 days or more but still accruing interest.