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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Provision for credit losses | $ 30,967 | $ 4,095 |  |  |
Ending Balance |  |  | $ 79,075 |  | $ 49,653
Ending balance: individually evaluated for impaired |  |  | 9,799 |  | 2,045
Ending balance: collectively evaluated for impaired |  |  | 69,276 |  | 47,608
Total |  |  | 6,313,944 | $ 6,189,148 | 5,871,070
Ending balance: individually evaluated for impaired |  |  | 45,563 |  | 20,676
Ending balance: collectively evaluated for impaired |  |  | 6,268,381 |  | 5,850,394
Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 7,724 |  | 4,185
Total |  |  | 1,691,140 |  | 1,565,349
Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 32,503 |  | 19,218
Ending balance: individually evaluated for impaired |  |  | 7,072 |  | 914
Ending balance: collectively evaluated for impaired |  |  | 25,431 |  | 18,304
Total |  |  | 2,190,098 |  | 2,138,376
Ending balance: individually evaluated for impaired |  |  | 36,513 |  | 11,111
Ending balance: collectively evaluated for impaired |  |  | 2,153,585 |  | 2,127,265
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 27,728 |  | 19,833
Ending balance: individually evaluated for impaired |  |  | 2,727 |  | 1,012
Ending balance: collectively evaluated for impaired |  |  | 25,001 |  | 18,821
Total |  |  | 1,272,240 |  | 1,180,320
Ending balance: individually evaluated for impaired |  |  | 7,544 |  | 5,627
Ending balance: collectively evaluated for impaired |  |  | 1,264,696 |  | 1,174,693
Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 2,852 |  | 2,254
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 2,852 |  | 2,254
Total |  |  | 413,458 |  | 389,387
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 413,458 |  | 389,387
Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  | 0 |  | 119
Ending balance: collectively evaluated for impaired |  |  | 7,724 |  | 4,066
Ending balance: individually evaluated for impaired |  |  | 1,506 |  | 3,938
Ending balance: collectively evaluated for impaired |  |  | 1,689,634 |  | 1,561,411
Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 8,268 |  | 4,163
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 8,268 |  | 4,163
Total |  |  | 747,008 |  | 597,638
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 747,008 |  | 597,638
Acquired Loans [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 52 | 178 |  |  |
Charge-offs | (162) | (576) |  |  |
Recoveries | 33 | 44 |  |  |
Provision for credit losses | 1,665 | 407 |  |  |
Ending Balance | 52 | 178 | 1,588 | 52 | 53
Total |  |  | 447,548 | 474,775 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 2 | 35 |  |  |
Charge-offs | (25) | (45) |  |  |
Recoveries | 13 | 24 |  |  |
Provision for credit losses | 10 | 21 |  |  |
Ending Balance | 2 | 35 | 0 | 2 | 35
Total |  |  | 251,834 | 265,554 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 37 | 4 |  |  |
Charge-offs | (1) | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision for credit losses | 1,202 | (4) |  |  |
Ending Balance | 37 | 4 | 1,238 | 37 | 0
Total |  |  | 148,759 | 159,173 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 13 | 139 |  |  |
Charge-offs | 0 | (526) |  |  |
Recoveries | 13 | 11 |  |  |
Provision for credit losses | 324 | 394 |  |  |
Ending Balance | 13 | 139 | 350 | 13 | 18
Total |  |  | 29,331 | 29,827 |
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 | 0 |  |  |
Provision for credit losses | 0 | 0 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 5,224 | 6,262 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 |  |  |
Charge-offs | (136) | (5) |  |  |
Recoveries | 7 | 9 |  |  |
Provision for credit losses | 129 | (4) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 12,400 | 13,959 |
Originated Loans [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 51,585 | 47,586 |  |  |
Charge-offs | (3,786) | (2,028) |  |  |
Recoveries | 386 | 354 |  |  |
Provision for credit losses | 29,302 | 3,688 |  |  |
Ending Balance | 51,585 | 47,586 | 77,487 | 51,585 | 49,600
Total |  |  | 5,866,396 | 5,714,373 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4,091 | 3,934 |  |  |
Charge-offs | (552) | (136) |  |  |
Recoveries | 62 | 81 |  |  |
Provision for credit losses | 4,123 | 271 |  |  |
Ending Balance | 4,091 | 3,934 | 7,724 | 4,091 | 4,150
Total |  |  | 1,439,306 | 1,415,808 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 19,731 | 18,382 |  |  |
Charge-offs | (265) | (299) |  |  |
Recoveries | 44 | 41 |  |  |
Provision for credit losses | 11,755 | 1,094 |  |  |
Ending Balance | 19,731 | 18,382 | 31,265 | 19,731 | 19,218
Total |  |  | 2,041,339 | 1,958,346 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 20,221 | 19,235 |  |  |
Charge-offs | (486) | (483) |  |  |
Recoveries | 68 | 76 |  |  |
Provision for credit losses | 7,575 | 987 |  |  |
Ending Balance | 20,221 | 19,235 | 27,378 | 20,221 | 19,815
Total |  |  | 1,242,909 | 1,212,026 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 2,558 | 2,002 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 42 |  |  |
Provision for credit losses | 294 | 210 |  |  |
Ending Balance | 2,558 | 2,002 | 2,852 | 2,558 | 2,254
Total |  |  | 408,234 | 442,777 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4,984 | 4,033 |  |  |
Charge-offs | (2,483) | (1,110) |  |  |
Recoveries | 212 | 114 |  |  |
Provision for credit losses | 5,555 | 1,126 |  |  |
Ending Balance | $ 4,984 | $ 4,033 | 8,268 | 4,984 | $ 4,163
Total |  |  | $ 734,608 | $ 685,416 |

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