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Loans and Leases (Recorded Fair Values of Purchased Non-Impaired Loans and Leases) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
loans
May 05, 2017
USD ($)
Sep. 01, 2016
USD ($)
PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 15 10    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,626 $ 6,444    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 4 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1,154 $ 3    
Non-PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 617 503    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 46,374 $ 41,031    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 200 143    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 10,836 $ 7,558    
Principal Forgiveness [Member] | PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 634 $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 634 $ 0    
Principal Forgiveness [Member] | PCI Loans | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 634 $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 634 $ 0    
Principal Forgiveness [Member] | Non-PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 5 3    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 572 $ 691    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 2    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 448    
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 4 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 490 $ 569    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 326    
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 122    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 122    
Extended Maturity [Member] | Non-PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 47 37    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 6,517 $ 6,919    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 2 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 273 $ 40    
Extended Maturity [Member] | Non-PCI Loans | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 40    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 40    
Extended Maturity [Member] | Non-PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 3 7    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,240 $ 2,428    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Commercial | Other commercial real estate        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 747    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 9 8    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 246 $ 1,070    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 1 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 35 $ 421    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 10 15    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,915 $ 2,183    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 243 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 14 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,233 $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 30 $ 0    
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Consumer        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 9 3    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 327 $ 30    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Interest Rate Below Market Reduction [Member] | PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 8 8    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,039 $ 3,479    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 101 $ 0    
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 52    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 4 4    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 725 $ 3,255    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Interest Rate Below Market Reduction [Member] | PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 4 3    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 314 $ 172    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 101 $ 0    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 355 309    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 29,373 $ 28,299    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 109 87    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 7,882 $ 6,054    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 3 6    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 170 $ 231    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 2 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 170 $ 0    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 49 45    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 11,716 $ 12,030    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 16 16    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 2,001 $ 1,986    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Other commercial real estate        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 5 3    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 340 $ 619    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 3 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 181 $ 0    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 27 34    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,227 $ 3,056    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 9 11    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 452 $ 1,144    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Lease financing        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 3 4    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 633 $ 152    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 2 4    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 588 $ 152    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 16 15    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,877 $ 676    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 3 4    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 43 $ 96    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 104 185    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 6,858 $ 11,087    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 33 48    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 2,867 $ 2,583    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Other        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 1 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 120    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 0 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 78    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 129 5    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 6,457 $ 106    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 36 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1,550 $ 0    
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Consumer        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 18 10    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 95 $ 222    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 5 2    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 30 $ 15    
Discharge of Debt [Member] | PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 6 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 953 $ 2,965    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 2 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 419 $ 3    
Discharge of Debt [Member] | PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 3 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 458 $ 2,965    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 262 $ 3    
Discharge of Debt [Member] | PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 3 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 495 $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 157 $ 0    
Discharge of Debt [Member] | Non-PCI Loans        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 210 154    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 9,912 $ 5,122    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 89 53    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 2,681 $ 1,016    
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 1 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 15 $ 22    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 15 $ 22    
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 8 4    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,052 $ 347    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 1 2    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 73    
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 10 6    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 56 $ 83    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 7 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0    
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Lease financing        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 17 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 431 $ 84    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 16 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 431 $ 0    
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 2 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 35 $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 2 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 35 $ 0    
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Consumer Portfolio Segment [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 85 69    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 1,003 $ 770    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 30 23    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 315 $ 250    
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 41 22    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 3,723 $ 773    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 17 14    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1,161 $ 326    
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loans 46 51    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,597 $ 3,043    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans 15 13    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 724 $ 345    
Guaranty Bank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition 703,916      
CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodCashFlowsNotExpectedtobeCollectedatAcquisition 16,073      
Total non-PCI loans and leases $ 574,553   $ 574,553  
Guaranty Bank | Commercial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     185,249  
Guaranty Bank | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     0  
Guaranty Bank | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     850  
Guaranty Bank | Commercial | Other commercial real estate        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     0  
Guaranty Bank | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     583  
Guaranty Bank | Commercial | Other        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     183,816  
Guaranty Bank | Noncommercial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     389,304  
Guaranty Bank | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     309,612  
Guaranty Bank | Noncommercial | Revolving mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     54,780  
Guaranty Bank | Noncommercial | Consumer        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases     $ 24,912  
Cordia Bancorp Inc.        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition       $ 296,529
CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodCashFlowsNotExpectedtobeCollectedatAcquisition       2,678
Total non-PCI loans and leases       241,392
Cordia Bancorp Inc. | Commercial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       134,468
Cordia Bancorp Inc. | Commercial | Construction and land development        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       3,066
Cordia Bancorp Inc. | Commercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       77,455
Cordia Bancorp Inc. | Commercial | Other commercial real estate        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       22,174
Cordia Bancorp Inc. | Commercial | Commercial and industrial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       31,773
Cordia Bancorp Inc. | Commercial | Other        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       0
Cordia Bancorp Inc. | Noncommercial        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       106,924
Cordia Bancorp Inc. | Noncommercial | Mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       16,839
Cordia Bancorp Inc. | Noncommercial | Revolving mortgage        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       9,867
Cordia Bancorp Inc. | Noncommercial | Consumer        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Total non-PCI loans and leases       $ 80,218