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Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance $ 154,923 $ 77,057 $ 76,703
Initial allowance for PCD loans (acquired during the period) 18,635 18,635  
Charge-offs (5,634) (14,395) (29,110)
Recoveries 1,290 3,363 8,151
Provision 45,907 73,019 21,313
Allowance for Loan Losses Ending balance 215,121 215,121 77,057
Allowance for Loan Losses, individually evaluated for impairment     16,499
Allowance for Loan Losses, collectively evaluated for impairment     60,558
Financing receivables     13,713,548
Financing receivables, individually evaluated for impairment     123,505
Financing receivables, collectively evaluated for impairment     13,494,039
Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   52,321  
Allowance for Loan Losses Ending balance     52,321
Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   5,121  
Allowance for Loan Losses Ending balance     5,121
Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     96,004
Construction & Land Development [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 18,792 3,353 7,992
Initial allowance for PCD loans (acquired during the period) 2,570 2,570  
Charge-offs (225) (1,969) (1,303)
Recoveries 517 1,361 175
Provision 10,649 10,126 (3,511)
Allowance for Loan Losses Ending balance 32,303 32,303 3,353
Allowance for Loan Losses, individually evaluated for impairment     262
Allowance for Loan Losses, collectively evaluated for impairment     3,091
Financing receivables     1,408,205
Financing receivables, individually evaluated for impairment     14,047
Financing receivables, collectively evaluated for impairment     1,382,369
Construction & Land Development [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   14,817  
Allowance for Loan Losses Ending balance     14,817
Construction & Land Development [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   2,045  
Allowance for Loan Losses Ending balance     2,045
Construction & Land Development [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     11,789
Bankcard [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 226 74  
Initial allowance for PCD loans (acquired during the period) 0 0  
Charge-offs (82) (128)  
Recoveries 6 12  
Provision 130 294  
Allowance for Loan Losses Ending balance 280 280 74
Financing receivables     10,074
Bankcard [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   28  
Allowance for Loan Losses Ending balance     28
Bankcard [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   0  
Allowance for Loan Losses Ending balance     0
Allowance for Estimated Imprecision [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 0 297 245
Initial allowance for PCD loans (acquired during the period) 0 0  
Charge-offs 0 0 0
Recoveries 0 0 0
Provision 0 0 52
Allowance for Loan Losses Ending balance 0 0 297
Allowance for Loan Losses, individually evaluated for impairment     0
Allowance for Loan Losses, collectively evaluated for impairment     297
Financing receivables     0
Financing receivables, individually evaluated for impairment     0
Financing receivables, collectively evaluated for impairment     0
Allowance for Estimated Imprecision [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   (297)  
Allowance for Loan Losses Ending balance     (297)
Allowance for Estimated Imprecision [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   0  
Allowance for Loan Losses Ending balance     0
Allowance for Estimated Imprecision [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     0
Commercial Real Estate [Member] | Owner-Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 19,495 5,554 5,063
Initial allowance for PCD loans (acquired during the period) 1,955 1,955  
Charge-offs (356) (535) (7,905)
Recoveries 244 310 3,733
Provision 1,400 3,874 4,663
Allowance for Loan Losses Ending balance 22,738 22,738 5,554
Allowance for Loan Losses, individually evaluated for impairment     973
Allowance for Loan Losses, collectively evaluated for impairment     4,581
Financing receivables     1,201,652
Financing receivables, individually evaluated for impairment     16,703
Financing receivables, collectively evaluated for impairment     1,160,556
Commercial Real Estate [Member] | Owner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   9,737  
Allowance for Loan Losses Ending balance     9,737
Commercial Real Estate [Member] | Owner-Occupied [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   1,843  
Allowance for Loan Losses Ending balance     1,843
Commercial Real Estate [Member] | Owner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     24,393
Commercial Real Estate [Member] | Nonowner-Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 17,569 8,524 6,919
Initial allowance for PCD loans (acquired during the period) 6,418 6,418  
Charge-offs (1,937) (1,937) (1,093)
Recoveries 137 722 80
Provision 3,590 2,906 2,618
Allowance for Loan Losses Ending balance 25,777 25,777 8,524
Allowance for Loan Losses, individually evaluated for impairment     2,979
Allowance for Loan Losses, collectively evaluated for impairment     5,545
Financing receivables     3,965,960
Financing receivables, individually evaluated for impairment     27,121
Financing receivables, collectively evaluated for impairment     3,925,249
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   9,023  
Allowance for Loan Losses Ending balance     9,023
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   121  
Allowance for Loan Losses Ending balance     121
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     13,590
Other Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 53,827 47,325 41,341
Initial allowance for PCD loans (acquired during the period) 7,032 7,032  
Charge-offs (1,340) (7,028) (12,975)
Recoveries 131 446 2,599
Provision 19,754 35,520 16,360
Allowance for Loan Losses Ending balance 79,404 79,404 47,325
Allowance for Loan Losses, individually evaluated for impairment     11,931
Allowance for Loan Losses, collectively evaluated for impairment     35,394
Financing receivables     2,285,037
Financing receivables, individually evaluated for impairment     54,108
Financing receivables, collectively evaluated for impairment     2,194,432
Other Commercial [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   (4,829)  
Allowance for Loan Losses Ending balance     (4,829)
Other Commercial [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   938  
Allowance for Loan Losses Ending balance     938
Other Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     36,497
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 30,624 8,997 12,448
Initial allowance for PCD loans (acquired during the period) 652 652  
Charge-offs (523) (890) (2,967)
Recoveries 160 302 858
Provision 7,970 16,551 (1,342)
Allowance for Loan Losses Ending balance 38,883 38,883 8,997
Allowance for Loan Losses, individually evaluated for impairment     354
Allowance for Loan Losses, collectively evaluated for impairment     8,643
Financing receivables     3,686,401
Financing receivables, individually evaluated for impairment     11,526
Financing receivables, collectively evaluated for impairment     3,665,140
Residential Real Estate [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   13,097  
Allowance for Loan Losses Ending balance     13,097
Residential Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   174  
Allowance for Loan Losses Ending balance     174
Residential Real Estate [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     9,735
Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   3,007 2,695
Charge-offs     (2,867)
Recoveries     706
Provision     2,473
Allowance for Loan Losses Ending balance     3,007
Allowance for Loan Losses, individually evaluated for impairment     0
Allowance for Loan Losses, collectively evaluated for impairment     3,007
Financing receivables     1,166,293
Financing receivables, individually evaluated for impairment     0
Financing receivables, collectively evaluated for impairment     1,166,293
Consumer [Member] | Loans Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses     0
Financing receivables     0
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance 14,390 2,933  
Initial allowance for PCD loans (acquired during the period) 8 8  
Charge-offs (1,171) (1,908)  
Recoveries 95 210  
Provision 2,414 3,748  
Allowance for Loan Losses Ending balance $ 15,736 15,736 2,933
Other Consumer [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   10,745  
Allowance for Loan Losses Ending balance     10,745
Other Consumer [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan Losses Beginning balance   $ 0  
Allowance for Loan Losses Ending balance     $ 0