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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Provision for credit losses | $ 2,708 | $ 2,961 | $ 9,638 | $ 11,032 |  |  |
Ending Balance |  |  |  |  | $ 50,035 |  | $ 50,746
Ending balance: individually evaluated for impaired |  |  |  |  | 1,546 |  | 5,363
Ending balance: collectively evaluated for impaired |  |  |  |  | 48,489 |  | 45,383
Total |  |  |  |  | 6,099,561 | $ 5,774,139 | 5,662,782
Ending balance: individually evaluated for impaired |  |  |  |  | 25,344 |  | 29,398
Ending balance: collectively evaluated for impaired |  |  |  |  | 6,074,217 |  | 5,633,384
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 3,917 |  | 3,657
Total |  |  |  |  | 1,666,220 |  | 1,533,338
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 19,048 |  | 19,671
Ending balance: individually evaluated for impaired |  |  |  |  | 488 |  | 1,722
Ending balance: collectively evaluated for impaired |  |  |  |  | 18,560 |  | 17,949
Total |  |  |  |  | 2,124,240 |  | 2,136,431
Ending balance: individually evaluated for impaired |  |  |  |  | 10,825 |  | 12,012
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,113,415 |  | 2,124,419
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 19,947 |  | 22,009
Ending balance: individually evaluated for impaired |  |  |  |  | 1,054 |  | 3,474
Ending balance: collectively evaluated for impaired |  |  |  |  | 18,893 |  | 18,535
Total |  |  |  |  | 1,210,936 |  | 1,116,204
Ending balance: individually evaluated for impaired |  |  |  |  | 10,417 |  | 12,864
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,200,519 |  | 1,103,340
Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 2,410 |  | 1,592
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,410 |  | 1,592
Total |  |  |  |  | 420,281 |  | 298,395
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 420,281 |  | 298,395
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 4 |  | 167
Ending balance: collectively evaluated for impaired |  |  |  |  | 3,913 |  | 3,490
Ending balance: individually evaluated for impaired |  |  |  |  | 4,102 |  | 4,522
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,662,118 |  | 1,528,816
Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 4,713 |  | 3,817
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,713 |  | 3,817
Total |  |  |  |  | 677,884 |  | 578,414
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 677,884 |  | 578,414
Acquired Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 65 | 156 | 178 | 46 |  |  |
Charge-offs | (1,428) | (13) | (2,032) | (165) |  |  |
Recoveries | 32 | 50 | 113 | 136 |  |  |
Provision for credit losses | 1,360 | (118) | 1,770 | 58 |  |  |
Ending Balance | 65 | 156 | 178 | 46 | 29 | 178 | 75
Total |  |  |  |  | 522,072 | 498,843 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 25 | 127 | 35 | 6 |  |  |
Charge-offs | 0 | (9) | (46) | (57) |  |  |
Recoveries | 11 | 25 | 46 | 75 |  |  |
Provision for credit losses | (35) | (96) | (34) | 23 |  |  |
Ending Balance | 25 | 127 | 35 | 6 | 1 | 35 | 47
Total |  |  |  |  | 285,734 | 248,760 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 25 | 6 | 4 | 29 |  |  |
Charge-offs | (1,376) | 0 | (1,376) | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Provision for credit losses | 1,372 | 2 | 1,393 | (21) |  |  |
Ending Balance | 25 | 6 | 4 | 29 | 21 | 4 | 8
Total |  |  |  |  | 176,707 | 201,195 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 15 | 23 | 139 | 11 |  |  |
Charge-offs | (49) | 0 | (601) | (93) |  |  |
Recoveries | 21 | 13 | 53 | 31 |  |  |
Provision for credit losses | 20 | (16) | 416 | 71 |  |  |
Ending Balance | 15 | 23 | 139 | 11 | 7 | 139 | 20
Total |  |  |  |  | 37,866 | 37,526 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 | 6 |  |  |
Provision for credit losses | 0 | 0 | 0 | (6) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 6,719 | 5,970 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | (3) | (4) | (9) | (15) |  |  |
Recoveries | 0 | 12 | 14 | 24 |  |  |
Provision for credit losses | 3 | (8) | (5) | (9) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 15,046 | 5,392 |
Originated Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 50,996 | 51,158 | 47,586 | 48,252 |  |  |
Charge-offs | (2,702) | (3,926) | (6,555) | (10,124) |  |  |
Recoveries | 364 | 360 | 1,107 | 1,569 |  |  |
Provision for credit losses | 1,348 | 3,079 | 7,868 | 10,974 |  |  |
Ending Balance | 50,996 | 51,158 | 47,586 | 48,252 | 50,006 | 47,586 | 50,671
Total |  |  |  |  | 5,577,489 | 5,275,296 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 4,133 | 3,556 | 3,934 | 2,753 |  |  |
Charge-offs | (383) | (268) | (617) | (949) |  |  |
Recoveries | 6 | 26 | 190 | 222 |  |  |
Provision for credit losses | 160 | 296 | 409 | 1,584 |  |  |
Ending Balance | 4,133 | 3,556 | 3,934 | 2,753 | 3,916 | 3,934 | 3,610
Total |  |  |  |  | 1,380,486 | 1,313,645 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 19,287 | 17,731 | 18,382 | 17,328 |  |  |
Charge-offs | (6) | 0 | (305) | (2,411) |  |  |
Recoveries | 81 | 36 | 160 | 123 |  |  |
Provision for credit losses | (335) | 1,896 | 790 | 4,623 |  |  |
Ending Balance | 19,287 | 17,731 | 18,382 | 17,328 | 19,027 | 18,382 | 19,663
Total |  |  |  |  | 1,947,533 | 1,922,349 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 20,678 | 25,082 | 19,235 | 23,418 |  |  |
Charge-offs | (742) | (2,582) | (1,584) | (3,443) |  |  |
Recoveries | 41 | 53 | 180 | 671 |  |  |
Provision for credit losses | (37) | (564) | 2,109 | 1,343 |  |  |
Ending Balance | 20,678 | 25,082 | 19,235 | 23,418 | 19,940 | 19,235 | 21,989
Total |  |  |  |  | 1,173,070 | 1,100,947 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2,491 | 1,262 | 2,002 | 1,349 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 74 | 92 | 158 | 93 |  |  |
Provision for credit losses | (155) | 238 | 250 | 150 |  |  |
Ending Balance | 2,491 | 1,262 | 2,002 | 1,349 | 2,410 | 2,002 | 1,592
Total |  |  |  |  | 413,562 | 353,008 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 4,407 | 3,527 | 4,033 | 3,404 |  |  |
Charge-offs | (1,571) | (1,076) | (4,049) | (3,321) |  |  |
Recoveries | 162 | 153 | 419 | 460 |  |  |
Provision for credit losses | 1,715 | 1,213 | 4,310 | 3,274 |  |  |
Ending Balance | $ 4,407 | $ 3,527 | $ 4,033 | $ 3,404 | 4,713 | 4,033 | $ 3,817
Total |  |  |  |  | $ 662,838 | $ 585,347 |

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