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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
Mar. 31, 2020
Mar. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period $ 54,238 $ 51,389
Impact of CECL adoption (3,195)  
Initial allowance on loans purchased with credit deterioration 502  
Charge- offs (1,160) (343)
Recoveries 112 185
Net charge-offs (1,048) (158)
Provision for credit losses on loans 19,583 1,684
Balance at end of period 70,080 52,915
Pegasus Bank [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 599  
Impact of CECL adoption 2,488  
Charge- offs (571)  
Recoveries 7  
Net charge-offs (564)  
Provision for credit losses on loans 640  
Balance at end of period 3,163  
Non-consumer Non-real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period   13,151
Charge- offs   (70)
Recoveries   67
Net charge-offs   (3)
Provision for credit losses on loans   1,261
Balance at end of period   14,409
Real Estate [Member] | Farmland [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 2,821  
Impact of CECL adoption (1,408)  
Initial allowance on loans purchased with credit deterioration 1  
Provision for credit losses on loans 374  
Balance at end of period 1,788  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 5,625  
Impact of CECL adoption (2,806)  
Initial allowance on loans purchased with credit deterioration 432  
Provision for credit losses on loans 1,293  
Balance at end of period 4,544  
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  
Impact of CECL adoption (5,507)  
Provision for credit losses on loans 3,084  
Balance at end of period 5,935  
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  
Impact of CECL adoption (1,056)  
Charge- offs (3)  
Net charge-offs (3)  
Provision for credit losses on loans (19)  
Balance at end of period 1,136  
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  
Impact of CECL adoption (778)  
Charge- offs (1)  
Net charge-offs (1)  
Provision for credit losses on loans 464  
Balance at end of period 1,618  
Real Estate [Member] | Residential Real Estate First Lien [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 8,692  
Impact of CECL adoption (3,831)  
Initial allowance on loans purchased with credit deterioration 7  
Charge- offs (152)  
Recoveries 2  
Net charge-offs (150)  
Provision for credit losses on loans 1,474  
Balance at end of period 6,192  
Real Estate [Member] | Residential Real Estate All Other [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 2,767 10,673
Impact of CECL adoption (1,408)  
Charge- offs (25) (52)
Recoveries 27 2
Net charge-offs 2 (50)
Provision for credit losses on loans 931 423
Balance at end of period 2,292 11,046
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period   6,328
Charge- offs   (6)
Recoveries   1
Net charge-offs   (5)
Provision for credit losses on loans   332
Balance at end of period   6,655
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period   11,027
Charge- offs   (6)
Net charge-offs   (6)
Provision for credit losses on loans   341
Balance at end of period   11,362
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period   3,261
Charge- offs   (63)
Recoveries   5
Net charge-offs   (58)
Provision for credit losses on loans   58
Balance at end of period   3,261
Commercial and Agricultural Non-Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 15,345  
Impact of CECL adoption 11,849  
Initial allowance on loans purchased with credit deterioration 62  
Charge- offs (87)  
Recoveries 17  
Net charge-offs (70)  
Provision for credit losses on loans 10,090  
Balance at end of period 37,276  
Consumer Non-real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 3,252 3,065
Impact of CECL adoption (622)  
Charge- offs (321) (120)
Recoveries 57 71
Net charge-offs (264) (49)
Provision for credit losses on loans 1,019 56
Balance at end of period 3,385 3,072
Other Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period 2,632 2,423
Impact of CECL adoption (116)  
Recoveries 2 35
Net charge-offs 2 35
Provision for credit losses on loans 233 (50)
Balance at end of period $ 2,751 2,408
Acquired Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Balance at beginning of period   1,461
Charge- offs   (26)
Recoveries   4
Net charge-offs   (22)
Provision for credit losses on loans   (737)
Balance at end of period   $ 702