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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Provision for credit losses | $ 4,095 | $ 6,903 |  |  |
Ending Balance |  |  | $ 49,653 |  | $ 53,732
Ending balance: individually evaluated for impaired |  |  | 2,045 |  | 11,473
Ending balance: collectively evaluated for impaired |  |  | 47,608 |  | 42,259
Total |  |  | 5,871,070 | $ 5,774,139 | 5,381,305
Ending balance: individually evaluated for impaired |  |  | 20,676 |  | 50,491
Ending balance: collectively evaluated for impaired |  |  | 5,850,394 |  | 5,330,814
Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 4,185 |  | 3,154
Total |  |  | 1,565,349 |  | 1,434,623
Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 19,218 |  | 18,496
Ending balance: individually evaluated for impaired |  |  | 914 |  | 2,141
Ending balance: collectively evaluated for impaired |  |  | 18,304 |  | 16,355
Total |  |  | 2,138,376 |  | 2,027,072
Ending balance: individually evaluated for impaired |  |  | 11,111 |  | 10,360
Ending balance: collectively evaluated for impaired |  |  | 2,127,265 |  | 2,016,712
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 19,833 |  | 27,552
Ending balance: individually evaluated for impaired |  |  | 1,012 |  | 9,045
Ending balance: collectively evaluated for impaired |  |  | 18,821 |  | 18,507
Total |  |  | 1,180,320 |  | 1,131,594
Ending balance: individually evaluated for impaired |  |  | 5,627 |  | 33,278
Ending balance: collectively evaluated for impaired |  |  | 1,174,693 |  | 1,098,316
Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 2,254 |  | 1,114
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 2,254 |  | 1,114
Total |  |  | 389,387 |  | 246,961
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 389,387 |  | 246,961
Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  | 119 |  | 287
Ending balance: collectively evaluated for impaired |  |  | 4,066 |  | 2,867
Ending balance: individually evaluated for impaired |  |  | 3,938 |  | 6,853
Ending balance: collectively evaluated for impaired |  |  | 1,561,411 |  | 1,427,770
Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 4,163 |  | 3,416
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 4,163 |  | 3,416
Total |  |  | 597,638 |  | 541,055
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 597,638 |  | 541,055
Acquired Loans [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 178 | 46 |  |  |
Charge-offs | (576) | (20) |  |  |
Recoveries | 44 | 37 |  |  |
Provision for credit losses | 407 | (28) |  |  |
Ending Balance | 178 | 46 | 53 | 178 | 35
Total |  |  | 478,318 | 498,843 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 35 | 6 |  |  |
Charge-offs | (45) | (16) |  |  |
Recoveries | 24 | 17 |  |  |
Provision for credit losses | 21 | 6 |  |  |
Ending Balance | 35 | 6 | 35 | 35 | 13
Total |  |  | 239,609 | 248,760 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4 | 29 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision for credit losses | (4) | (27) |  |  |
Ending Balance | 4 | 29 | 0 | 4 | 2
Total |  |  | 191,894 | 201,195 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 139 | 11 |  |  |
Charge-offs | (526) | 0 |  |  |
Recoveries | 11 | 7 |  |  |
Provision for credit losses | 394 | 2 |  |  |
Ending Balance | 139 | 11 | 18 | 139 | 20
Total |  |  | 36,435 | 37,526 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 6 |  |  |
Provision for credit losses | 0 | (6) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 6,223 | 5,970 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 |  |  |
Charge-offs | (5) | (4) |  |  |
Recoveries | 9 | 7 |  |  |
Provision for credit losses | (4) | (3) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 4,157 | 5,392 |
Originated Loans [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 47,586 | 48,252 |  |  |
Charge-offs | (2,028) | (2,082) |  |  |
Recoveries | 354 | 596 |  |  |
Provision for credit losses | 3,688 | 6,931 |  |  |
Ending Balance | 47,586 | 48,252 | 49,600 | 47,586 | 53,697
Total |  |  | 5,392,752 | 5,275,296 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 3,934 | 2,753 |  |  |
Charge-offs | (136) | (455) |  |  |
Recoveries | 81 | 75 |  |  |
Provision for credit losses | 271 | 768 |  |  |
Ending Balance | 3,934 | 2,753 | 4,150 | 3,934 | 3,141
Total |  |  | 1,325,740 | 1,313,645 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 18,382 | 17,328 |  |  |
Charge-offs | (299) | (168) |  |  |
Recoveries | 41 | 69 |  |  |
Provision for credit losses | 1,094 | 1,265 |  |  |
Ending Balance | 18,382 | 17,328 | 19,218 | 18,382 | 18,494
Total |  |  | 1,946,482 | 1,922,349 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 19,235 | 23,418 |  |  |
Charge-offs | (483) | (290) |  |  |
Recoveries | 76 | 256 |  |  |
Provision for credit losses | 987 | 4,148 |  |  |
Ending Balance | 19,235 | 23,418 | 19,815 | 19,235 | 27,532
Total |  |  | 1,143,885 | 1,100,947 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 2,002 | 1,349 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 42 | 1 |  |  |
Provision for credit losses | 210 | (236) |  |  |
Ending Balance | 2,002 | 1,349 | 2,254 | 2,002 | 1,114
Total |  |  | 383,164 | 353,008 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4,033 | 3,404 |  |  |
Charge-offs | (1,110) | (1,169) |  |  |
Recoveries | 114 | 195 |  |  |
Provision for credit losses | 1,126 | 986 |  |  |
Ending Balance | $ 4,033 | $ 3,404 | 4,163 | 4,033 | $ 3,416
Total |  |  | $ 593,481 | $ 585,347 |

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