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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | $ 48,298 | $ 50,185 |
Charge-offs | (15,113) | (12,509) |
Provision for credit losses | 12,531 | 5,087 | $ 18,480
Ending Balance | 47,764 | 48,298 | 50,185
Ending balance: individually evaluated for impaired | 1,631 | 3,746 | 3,144
Ending balance: collectively evaluated for impaired | 46,133 | 44,552 | 47,041
Ending balance | 5,774,139 | 5,407,376 | 4,879,347
Ending balance: individually evaluated for impaired | 21,088 | 35,151 | 33,668
Ending balance: collectively evaluated for impaired | 5,753,051 | 5,372,225 | 4,845,679
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 23,429 | 35,974 |
Ending Balance | 19,374 | 23,429 | 35,974
Ending balance: individually evaluated for impaired | 928 | 3,478 | 2,530
Ending balance: collectively evaluated for impaired | 18,446 | 19,951 | 33,444
Ending balance | 1,138,473 | 1,163,383 | 1,139,547
Ending balance: individually evaluated for impaired | 11,631 | 22,450 | 22,325
Ending balance: collectively evaluated for impaired | 1,126,842 | 1,140,933 | 1,117,222
Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 1,349 | 577 |
Ending Balance | 2,002 | 1,349 | 577
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 2,002 | 1,349 | 577
Ending balance | 358,978 | 248,868 | 219,621
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 358,978 | 248,868 | 219,621
Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,759 | 2,511 |
Ending Balance | 3,969 | 2,759 | 2,511
Ending balance: individually evaluated for impaired | 107 | 111 | 180
Ending balance: collectively evaluated for impaired | 3,862 | 2,648 | 2,331
Ending balance | 1,562,405 | 1,426,370 | 1,229,192
Ending balance: individually evaluated for impaired | 3,747 | 6,698 | 5,875
Ending balance: collectively evaluated for impaired | 1,558,658 | 1,419,672 | 1,223,317
Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 17,357 | 6,619 |
Ending Balance | 18,386 | 17,357 | 6,619
Ending balance: individually evaluated for impaired | 596 | 157 | 434
Ending balance: collectively evaluated for impaired | 17,790 | 17,200 | 6,185
Ending balance | 2,123,544 | 2,019,096 | 1,742,210
Ending balance: individually evaluated for impaired | 5,710 | 6,003 | 5,468
Ending balance: collectively evaluated for impaired | 2,117,834 | 2,013,093 | 1,736,742
Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 3,404 | 4,504 |
Ending Balance | 4,033 | 3,404 | 4,504
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 4,033 | 3,404 | 4,504
Ending balance | 590,739 | 549,659 | 548,777
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 590,739 | 549,659 | 548,777
Originated Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 48,252 | 50,166 | 50,812
Charge-offs | (14,902) | (11,997) | (26,305)
Recoveries | 1,846 | 5,403 | 7,198
Provision for credit losses | 12,390 | 4,680 | 18,461
Ending Balance | 47,586 | 48,252 | 50,166
Ending balance | 5,275,296 | 5,007,361 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 23,418 | 35,974 | 31,035
Charge-offs | (5,201) | (6,176) | (19,603)
Recoveries | 746 | 3,900 | 4,164
Provision for credit losses | 272 | (10,280) | 20,378
Ending Balance | 19,235 | 23,418 | 35,974
Ending balance | 1,100,947 | 1,122,741 |
Originated Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 1,349 | 577 | 887
Charge-offs | 0 | 0 | 0
Recoveries | 135 | 465 | 562
Provision for credit losses | 518 | 307 | (872)
Ending Balance | 2,002 | 1,349 | 577
Ending balance | 353,008 | 242,905 |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,753 | 2,492 | 2,606
Charge-offs | (1,217) | (1,261) | (1,189)
Recoveries | 233 | 304 | 481
Provision for credit losses | 2,165 | 1,218 | 594
Ending Balance | 3,934 | 2,753 | 2,492
Ending balance | 1,313,645 | 1,206,119 |
Originated Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 17,328 | 6,619 | 11,924
Charge-offs | (3,930) | (340) | (570)
Recoveries | 153 | 274 | 1,522
Provision for credit losses | 4,831 | 10,775 | (6,257)
Ending Balance | 18,382 | 17,328 | 6,619
Ending balance | 1,922,349 | 1,892,185 |
Originated Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 3,404 | 4,504 | 4,360
Charge-offs | (4,554) | (4,220) | (4,943)
Recoveries | 579 | 460 | 469
Provision for credit losses | 4,604 | 2,660 | 4,618
Ending Balance | 4,033 | 3,404 | 4,504
Ending balance | 585,347 | 543,411 |
Acquired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 46 | 19 |
Charge-offs | (211) | (512) |
Recoveries | 202 | 132 |
Provision for credit losses | 141 | 407 |
Ending Balance | 178 | 46 | 19
Ending balance | 498,843 | 400,015 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 11 | 0 |
Charge-offs | (93) | (458) |
Recoveries | 42 | 1 |
Provision for credit losses | 179 | 468 |
Ending Balance | 139 | 11 | 0
Ending balance | 37,526 | 40,642 |
Acquired Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 6 | 5 |
Provision for credit losses | (6) | (5) |
Ending Balance | 0 | 0 | 0
Ending balance | 5,970 | 5,963 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 6 | 19 |
Charge-offs | (96) | (26) |
Recoveries | 128 | 67 |
Provision for credit losses | (3) | (54) |
Ending Balance | 35 | 6 | 19
Ending balance | 248,760 | 220,251 |
Acquired Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 29 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 4 |
Provision for credit losses | (25) | 25 |
Ending Balance | 4 | 29 | 0
Ending balance | 201,195 | 126,911 |
Acquired Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 | 0 |
Charge-offs | (22) | (28) |
Recoveries | 26 | 55 |
Provision for credit losses | (4) | (27) |
Ending Balance | 0 | 0 | $ 0
Ending balance | $ 5,392 | $ 6,248 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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