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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 51,637 $ 47,764  
Ending Balance 101,309 51,637 $ 47,764
Ending balance: individually evaluated for impaired 4,906 2,432 1,631
Ending balance: collectively evaluated for impaired 96,403 49,205 46,133
Ending balance: individually evaluated for impaired   17,833 21,088
Ending balance: collectively evaluated for impaired   6,171,315 5,753,051
Financing receivable, before allowance for credit loss 6,761,183    
Financing Receivable, Allowance for Credit Loss, Writeoff (19,250) (12,300)  
Recoveries 2,057    
Provision for credit losses 53,472    
Loans 6,761,183 6,189,148 5,774,139
Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 41,463    
Ending balance: collectively evaluated for impaired 6,719,720    
Financing receivable, before allowance for credit loss 6,761,183    
Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,541,382    
Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 14,604    
Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,144,323    
Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 606,269    
Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 371,239    
Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,421,151    
Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 419,179    
Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 12,360    
Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 90,655    
Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 13,393    
Ending Balance   13,393  
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 20,234 19,374  
Ending Balance 17,187 20,234 19,374
Ending balance: individually evaluated for impaired 1,268 1,580 928
Ending balance: collectively evaluated for impaired 15,919 18,654 18,446
Ending balance: individually evaluated for impaired   9,246 11,631
Ending balance: collectively evaluated for impaired   1,232,607 1,126,842
Financing Receivable, Allowance for Credit Loss, Writeoff (6,318)    
Recoveries 314    
Provision for credit losses 1,479    
Loans   1,241,853 1,138,473
Commercial, financial, agricultural and other [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 5,411    
Ending balance: collectively evaluated for impaired 1,550,575    
Financing receivable, before allowance for credit loss 1,555,986    
Commercial, financial, agricultural and other [Member] | Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 16,838 0  
Ending balance: individually evaluated for impaired 1,268    
Ending balance: collectively evaluated for impaired 15,570    
Financing Receivable, Allowance for Credit Loss, Writeoff (6,220)    
Recoveries 301    
Provision for credit losses 1,515    
Commercial, financial, agricultural and other [Member] | Time and demand loans | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 5,411    
Ending balance: collectively evaluated for impaired 1,535,971    
Financing receivable, before allowance for credit loss 1,541,382    
Commercial, financial, agricultural and other [Member] | Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 349 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 349    
Financing Receivable, Allowance for Credit Loss, Writeoff (98)    
Recoveries 13    
Provision for credit losses (36)    
Commercial, financial, agricultural and other [Member] | Commercial credit cards | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 14,604    
Financing receivable, before allowance for credit loss 14,604    
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 1,478    
Ending Balance   1,478  
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 21,242    
Ending Balance   21,242  
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 470    
Ending Balance   470  
Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,558 2,002  
Ending Balance 7,966 2,558 2,002
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 7,966 2,558 2,002
Ending balance: individually evaluated for impaired   0 0
Ending balance: collectively evaluated for impaired   449,039 358,978
Financing Receivable, Allowance for Credit Loss, Writeoff 0    
Recoveries 26    
Provision for credit losses 4,820    
Loans   449,039 358,978
Real Estate Construction [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 427,221    
Financing receivable, before allowance for credit loss 427,221    
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 562    
Ending Balance   562  
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 19,768 18,386  
Ending Balance 41,953 19,768 18,386
Ending balance: individually evaluated for impaired 3,638 851 596
Ending balance: collectively evaluated for impaired 38,315 18,917 17,790
Ending balance: individually evaluated for impaired   6,846 5,710
Ending balance: collectively evaluated for impaired   2,110,673 2,117,834
Financing Receivable, Allowance for Credit Loss, Writeoff (4,939)    
Recoveries 312    
Provision for credit losses 27,019    
Loans   2,117,519 2,123,544
Commercial real estate [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 34,947    
Ending balance: collectively evaluated for impaired 2,176,622    
Financing receivable, before allowance for credit loss 2,211,569    
Commercial real estate [Member] | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 6,240 0  
Ending balance: individually evaluated for impaired 116    
Ending balance: collectively evaluated for impaired 6,124    
Financing Receivable, Allowance for Credit Loss, Writeoff 0    
Recoveries 0    
Provision for credit losses 4,593    
Commercial real estate [Member] | Multifamily | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 459    
Ending balance: collectively evaluated for impaired 370,780    
Financing receivable, before allowance for credit loss 371,239    
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 28,414 0  
Ending balance: individually evaluated for impaired 3,508    
Ending balance: collectively evaluated for impaired 24,906    
Financing Receivable, Allowance for Credit Loss, Writeoff (4,678)    
Recoveries 187    
Provision for credit losses 20,588    
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 31,450    
Ending balance: collectively evaluated for impaired 1,389,701    
Financing receivable, before allowance for credit loss 1,421,151    
Commercial real estate [Member] | Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 7,299 0  
Ending balance: individually evaluated for impaired 14    
Ending balance: collectively evaluated for impaired 7,285    
Financing Receivable, Allowance for Credit Loss, Writeoff (261)    
Recoveries 125    
Provision for credit losses 1,838    
Commercial real estate [Member] | Owner Occupied Commercial Real Estate | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 3,038    
Ending balance: collectively evaluated for impaired 416,141    
Financing receivable, before allowance for credit loss 419,179    
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance (207)    
Ending Balance   (207)  
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 1,647    
Ending Balance   1,647  
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 12,317    
Ending Balance   12,317  
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 5,597    
Ending Balance   5,597  
Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,984 4,033  
Ending Balance 19,845 4,984 4,033
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 19,845 4,984 4,033
Ending balance: individually evaluated for impaired   0 0
Ending balance: collectively evaluated for impaired   699,375 590,739
Financing Receivable, Allowance for Credit Loss, Writeoff (6,953)    
Recoveries 991    
Provision for credit losses 16,539    
Loans   699,375 590,739
Loans To Individuals [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 815,815    
Financing receivable, before allowance for credit loss 815,815    
Loans To Individuals [Member] | Automobiles      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 16,133 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 16,133    
Financing Receivable, Allowance for Credit Loss, Writeoff (3,954)    
Recoveries 745    
Provision for credit losses 13,236    
Loans To Individuals [Member] | Automobiles | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 712,800    
Financing receivable, before allowance for credit loss 712,800    
Loans To Individuals [Member] | Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 635 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 635    
Financing Receivable, Allowance for Credit Loss, Writeoff (595)    
Recoveries 36    
Provision for credit losses 973    
Loans To Individuals [Member] | Consumer Credit Cards | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 12,360    
Financing receivable, before allowance for credit loss 12,360    
Loans To Individuals [Member] | Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 3,077 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 3,077    
Financing Receivable, Allowance for Credit Loss, Writeoff (2,404)    
Recoveries 210    
Provision for credit losses 2,330    
Loans To Individuals [Member] | Other consumer loans | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 90,655    
Financing receivable, before allowance for credit loss 90,655    
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,284    
Ending Balance   4,284  
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Automobiles      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 6,106    
Ending Balance   6,106  
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 221    
Ending Balance   221  
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,941    
Ending Balance   2,941  
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,093 3,969  
Ending Balance 14,358 4,093 3,969
Ending balance: individually evaluated for impaired 0 1 107
Ending balance: collectively evaluated for impaired 14,358 4,092 3,862
Ending balance: individually evaluated for impaired   1,741 3,747
Ending balance: collectively evaluated for impaired   1,679,621 1,558,658
Financing Receivable, Allowance for Credit Loss, Writeoff (1,040)    
Recoveries 414    
Provision for credit losses 3,615    
Loans   1,681,362 1,562,405
Residential Real Estate [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 1,105    
Ending balance: collectively evaluated for impaired 1,749,487    
Financing receivable, before allowance for credit loss 1,750,592    
Residential Real Estate [Member] | Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 7,919 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 7,919    
Financing Receivable, Allowance for Credit Loss, Writeoff (550)    
Recoveries 296    
Provision for credit losses 847    
Residential Real Estate [Member] | Senior Lien | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 528    
Ending balance: collectively evaluated for impaired 1,143,795    
Financing receivable, before allowance for credit loss 1,144,323    
Residential Real Estate [Member] | Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 6,439 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 6,439    
Financing Receivable, Allowance for Credit Loss, Writeoff (490)    
Recoveries 118    
Provision for credit losses 2,768    
Residential Real Estate [Member] | Junior Lien | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 577    
Ending balance: collectively evaluated for impaired 605,692    
Financing receivable, before allowance for credit loss 606,269    
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 7,276    
Ending Balance   7,276  
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 7,326    
Ending Balance   7,326  
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,043    
Ending Balance   4,043  
Originated Loans [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 51,585 47,586 48,252
Ending Balance   51,585 47,586
Financing Receivable, Allowance for Credit Loss, Writeoff   (10,032) (14,902)
Recoveries   1,449 1,846
Provision for credit losses   12,582 12,390
Loans   5,714,373  
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 20,221 19,235 23,418
Ending Balance   20,221 19,235
Financing Receivable, Allowance for Credit Loss, Writeoff   (2,667) (5,201)
Recoveries   245 746
Provision for credit losses   3,408 272
Loans   1,212,026  
Originated Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,558 2,002 1,349
Ending Balance   2,558 2,002
Financing Receivable, Allowance for Credit Loss, Writeoff   0 0
Recoveries   158 135
Provision for credit losses   398 518
Loans   442,777  
Originated Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 19,731 18,382 17,328
Ending Balance   19,731 18,382
Financing Receivable, Allowance for Credit Loss, Writeoff   (632) (3,930)
Recoveries   189 153
Provision for credit losses   1,792 4,831
Loans   1,958,346  
Originated Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,984 4,033 3,404
Ending Balance   4,984 4,033
Financing Receivable, Allowance for Credit Loss, Writeoff   (5,747) (4,554)
Recoveries   611 579
Provision for credit losses   6,087 4,604
Loans   685,416  
Originated Loans [Member] | Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,091 3,934 2,753
Ending Balance   4,091 3,934
Financing Receivable, Allowance for Credit Loss, Writeoff   (986) (1,217)
Recoveries   246 233
Provision for credit losses   897 2,165
Loans   1,415,808  
Acquired Loans [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 52 178 46
Ending Balance   52 178
Financing Receivable, Allowance for Credit Loss, Writeoff   (2,242) (211)
Recoveries   165 202
Provision for credit losses   1,951 141
Loans   474,775  
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 13 139 11
Ending Balance   13 139
Financing Receivable, Allowance for Credit Loss, Writeoff   (726) (93)
Recoveries   81 42
Provision for credit losses   519 179
Loans   29,827  
Acquired Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0 0 0
Ending Balance   0 0
Financing Receivable, Allowance for Credit Loss, Writeoff   0 0
Recoveries   0 6
Provision for credit losses   0 (6)
Loans   6,262  
Acquired Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 37 4 29
Ending Balance   37 4
Financing Receivable, Allowance for Credit Loss, Writeoff   (1,376) 0
Recoveries   0 0
Provision for credit losses   1,409 (25)
Loans   159,173  
Acquired Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0 0 0
Ending Balance   0 0
Financing Receivable, Allowance for Credit Loss, Writeoff   (84) (22)
Recoveries   15 26
Provision for credit losses   69 (4)
Loans   13,959  
Acquired Loans [Member] | Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 2 35 6
Ending Balance   2 35
Financing Receivable, Allowance for Credit Loss, Writeoff   (56) (96)
Recoveries   69 128
Provision for credit losses   (46) $ (3)
Loans   $ 265,554