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Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period $ 54,238 $ 90,860 $ 70,080 $ 91,366 $ 54,238
Impact of CECL adoption (3,200)       (3,195)
Initial allowance on loans purchased with credit deterioration   7,272   7,272 502
Charge- offs   (4,448) (462) (5,114) (1,622)
Recoveries   228 549 388 661
Net charge-offs   (4,220) 87 (4,726) (961)
(Benefit from) provision for credit losses   (9,949) 19,333 (9,949) 38,916
Balance at end of period   83,963 89,500 83,963 89,500
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 5,625 6,595 4,544 7,035 5,625
Impact of CECL adoption         (2,806)
Initial allowance on loans purchased with credit deterioration   987   987 432
Charge- offs     (113)   (113)
Recoveries   1 1 1 1
Net charge-offs   1 (112) 1 (112)
(Benefit from) provision for credit losses   (828) 2,198 (1,268) 3,491
Balance at end of period   6,755 6,630 6,755 6,630
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 8,358 16,955 5,935 11,842 8,358
Impact of CECL adoption         (5,507)
Initial allowance on loans purchased with credit deterioration   633   633  
Charge- offs   (758)   (796)  
Net charge-offs   (758)   (796)  
(Benefit from) provision for credit losses   (2,340) 3,548 2,811 6,632
Balance at end of period   14,490 9,483 14,490 9,483
Real Estate [Member] | Construction and Development Less than 60 Months [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 2,214 2,743 1,136 2,560 2,214
Impact of CECL adoption         (1,056)
Initial allowance on loans purchased with credit deterioration   173   173  
Charge- offs     (56)   (59)
Recoveries   2 3 5 3
Net charge-offs   2 (53) 5 (56)
(Benefit from) provision for credit losses   (25) 672 155 653
Balance at end of period   2,893 1,755 2,893 1,755
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 1,933 983 1,618 627 1,933
Impact of CECL adoption         (778)
Charge- offs     (28)   (29)
Net charge-offs     (28)   (29)
(Benefit from) provision for credit losses   (94) 669 262 1,133
Balance at end of period   889 2,259 889 2,259
Real Estate [Member] | Residential Real Estate First Lien [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 8,692 2,592 6,192 2,570 8,692
Impact of CECL adoption         (3,831)
Initial allowance on loans purchased with credit deterioration   117   117 7
Charge- offs   (9) (66) (52) (218)
Recoveries   12 4 27 6
Net charge-offs   3 (62) (25) (212)
(Benefit from) provision for credit losses   93 2,423 143 3,897
Balance at end of period   2,805 8,553 2,805 8,553
Real Estate [Member] | Residential Real Estate All Other [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 2,767 1,873 2,292 2,230 2,767
Impact of CECL adoption         (1,408)
Charge- offs   (30) (7) (46) (32)
Recoveries   1 1 4 28
Net charge-offs   (29) (6) (42) (4)
(Benefit from) provision for credit losses   97 434 (247) 1,365
Balance at end of period   1,941 2,720 1,941 2,720
Commercial and Agricultural Non-Real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 13,462 32,685 33,993 32,400 13,462
Impact of CECL adoption         13,195
Initial allowance on loans purchased with credit deterioration   4,711   4,711 62
Charge- offs   (3,433) (287) (3,537) (374)
Recoveries   125 66 151 83
Net charge-offs   (3,308) (221) (3,386) (291)
(Benefit from) provision for credit losses   (2,473) 264 (2,110) 7,608
Balance at end of period   31,615 34,036 31,615 34,036
Consumer Non-real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 3,252 3,256 3,385 3,377 3,252
Impact of CECL adoption         (622)
Initial allowance on loans purchased with credit deterioration   8   8  
Charge- offs   (209) (235) (622) (556)
Recoveries   86 57 198 114
Net charge-offs   (123) (178) (424) (442)
(Benefit from) provision for credit losses   174 1,507 354 2,526
Balance at end of period   3,315 4,714 3,315 4,714
Oil and Gas [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 1,883 12,131 3,283 17,851 1,883
Impact of CECL adoption         (1,346)
(Benefit from) provision for credit losses   (4,314) 7,186 (10,034) 9,932
Balance at end of period   7,817 10,469 7,817 10,469
Other Loans [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 2,632 3,190 2,751 3,182 2,632
Impact of CECL adoption         (116)
Charge- offs   (9)   (61)  
Recoveries         2
Net charge-offs   (9)   (61) 2
(Benefit from) provision for credit losses   (43) (238) 17 (5)
Balance at end of period   3,138 2,513 3,138 2,513
Farmland [Member] | Real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period 2,821 3,077 1,788 3,136 2,821
Impact of CECL adoption         (1,408)
Initial allowance on loans purchased with credit deterioration   643   643 1
Recoveries   1   1  
Net charge-offs   1   1  
(Benefit from) provision for credit losses   (6) 723 (65) 1,097
Balance at end of period   3,715 2,511 3,715 2,511
Pegasus Bank [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Balance at beginning of period $ 599 4,780 3,163 4,556 599
Impact of CECL adoption         2,488
Charge- offs     330   (241)
Recoveries     417 1 424
Net charge-offs     747 1 183
(Benefit from) provision for credit losses   (190) (53) 33 587
Balance at end of period   $ 4,590 $ 3,857 $ 4,590 $ 3,857