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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
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period $ 70,080 $ 52,915 $ 54,238 $ 51,389
Impact of CECL adoption     (3,195)  
Initial allowance on loans purchased with credit deterioration     502  
Charge- offs (462) (585) (1,622) (928)
Recoveries 549 345 661 530
Net charge-offs 87 (240) (961) (398)
Provision for credit losses on loans 19,333 2,433 38,916 4,117
Balance at end of period 89,500 55,108 89,500 55,108
Non-consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period   14,409   13,151
Charge- offs   (87)   (157)
Recoveries   85   152
Net charge-offs   (2)   (5)
Provision for credit losses on loans   825   2,086
Balance at end of period   15,232   15,232
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 4,544   5,625  
Impact of CECL adoption     (2,806)  
Initial allowance on loans purchased with credit deterioration     432  
Charge- offs (113)   (113)  
Recoveries 1   1  
Net charge-offs (112)   (112)  
Provision for credit losses on loans 2,198   3,491  
Balance at end of period 6,630   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 5,935   8,358  
Impact of CECL adoption     (5,507)  
Provision for credit losses on loans 3,548   6,632  
Balance at end of period 9,483   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 1,136   2,214  
Impact of CECL adoption     (1,056)  
Charge- offs (56)   (59)  
Recoveries 3   3  
Net charge-offs (53)   (56)  
Provision for credit losses on loans 672   653  
Balance at end of period 1,755   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 1,618   1,933  
Impact of CECL adoption     (778)  
Charge- offs (28)   (29)  
Net charge-offs (28)   (29)  
Provision for credit losses on loans 669   1,133  
Balance at end of period 2,259   2,259  
Real Estate [Member] | Residential Real Estate First Lien [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 6,192   8,692  
Impact of CECL adoption     (3,831)  
Initial allowance on loans purchased with credit deterioration     7  
Charge- offs (66)   (218)  
Recoveries 4   6  
Net charge-offs (62)   (212)  
Provision for credit losses on loans 2,423   3,897  
Balance at end of period 8,553   8,553  
Real Estate [Member] | Residential Real Estate All Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 2,292 11,046 2,767 10,673
Impact of CECL adoption     (1,408)  
Charge- offs (7) (143) (32) (195)
Recoveries 1 25 28 27
Net charge-offs (6) (118) (4) (168)
Provision for credit losses on loans 434 793 1,365 1,216
Balance at end of period 2,720 11,721 2,720 11,721
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period   6,655   6,328
Charge- offs   (3)   (9)
Recoveries       1
Net charge-offs   (3)   (8)
Provision for credit losses on loans   235   567
Balance at end of period   6,887   6,887
Real Estate [Member] | Non-residential Real Estate Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period   11,362   11,027
Charge- offs   (16)   (22)
Recoveries   1   1
Net charge-offs   (15)   (21)
Provision for credit losses on loans   (60)   281
Balance at end of period   11,287   11,287
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period   3,261   3,261
Charge- offs   (4)   (67)
Recoveries   4   9
Net charge-offs       (58)
Provision for credit losses on loans   64   122
Balance at end of period   3,325   3,325
Commercial and Agricultural Non-Real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 37,276   15,345  
Impact of CECL adoption     11,849  
Initial allowance on loans purchased with credit deterioration     62  
Charge- offs (287)   (374)  
Recoveries 66   83  
Net charge-offs (221)   (291)  
Provision for credit losses on loans 7,450   17,540  
Balance at end of period 44,505   44,505  
Consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 3,385 3,072 3,252 3,065
Impact of CECL adoption     (622)  
Charge- offs (235) (162) (556) (282)
Recoveries 57 38 114 109
Net charge-offs (178) (124) (442) (173)
Provision for credit losses on loans 1,507 286 2,526 342
Balance at end of period 4,714 3,234 4,714 3,234
Other Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 2,751 2,408 2,632 2,423
Impact of CECL adoption     (116)  
Recoveries   43 2 78
Net charge-offs   43 2 78
Provision for credit losses on loans (238) (2) (5) (52)
Balance at end of period 2,513 2,449 2,513 2,449
Acquired Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period   702   1,461
Charge- offs   (170)   (196)
Recoveries   149   153
Net charge-offs   (21)   (43)
Provision for credit losses on loans   292   (445)
Balance at end of period   $ 973   $ 973
Farmland [Member] | Real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 1,788   2,821  
Impact of CECL adoption     (1,408)  
Initial allowance on loans purchased with credit deterioration     1  
Provision for credit losses on loans 723   1,097  
Balance at end of period 2,511   2,511  
Pegasus Bank [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 3,163   599  
Impact of CECL adoption     2,488  
Charge- offs 330   (241)  
Recoveries 417   424  
Net charge-offs 747   183  
Provision for credit losses on loans (53)   587  
Balance at end of period $ 3,857   $ 3,857