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Loans and Allowance for Loan and Lease Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually $ 46,045   $ 39,313      
Loan Evaluation, Collectively 3,135,393   2,755,945      
Loans 3,196,462   2,810,856      
ALLL Allocations, Individually 4,462   2,713      
ALLL Allocations, Collectively 20,081   16,035      
ALLL Allocations, Total ALLL 24,547 $ 20,022 18,748 $ 19,797 $ 19,093 $ 15,405
Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 15,024   15,598      
ALLL Allocations, PCI 4          
Commercial real estate            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 5,874   1,013      
Loan Evaluation, Collectively 751,150   735,118      
Loans 766,839   745,893      
ALLL Allocations, Individually 460   123      
ALLL Allocations, Collectively 3,343   3,312      
ALLL Allocations, Total ALLL 3,803 3,468 3,435 2,506 2,243 1,813
Commercial real estate | Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 9,815   9,762      
Construction, land development, land            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 140   136      
Loan Evaluation, Collectively 143,832   130,732      
Loans 147,852   134,812      
ALLL Allocations, Individually 21          
ALLL Allocations, Collectively 1,004   883      
ALLL Allocations, Total ALLL 1,025 998 883 915 566 465
Construction, land development, land | Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 3,880   3,944      
1-4 family residential properties            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 2,170   2,638      
Loan Evaluation, Collectively 119,907   122,093      
Loans 122,653   125,827      
ALLL Allocations, Individually 125   152      
ALLL Allocations, Collectively 115   141      
ALLL Allocations, Total ALLL 240 248 293 149 160 253
1-4 family residential properties | Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 576   1,096      
Farmland            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 3,513   3,800      
Loan Evaluation, Collectively 173,440   176,232      
Loans 177,060   180,141      
ALLL Allocations, Individually 72          
ALLL Allocations, Collectively 437   310      
ALLL Allocations, Total ALLL 509 618 310 261 214 170
Farmland | Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 107   109      
Commercial Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 29,478   26,616      
Loan Evaluation, Collectively 976,319   893,509      
Loans 1,006,443   920,812      
ALLL Allocations, Individually 2,199   1,409      
ALLL Allocations, Collectively 8,027   6,741      
ALLL Allocations, Total ALLL 10,230 9,193 8,150 10,603 11,177 8,014
Commercial Loans | Purchased Credit Impaired Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans 646   687      
ALLL Allocations, PCI 4          
Factored receivables            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 4,607   4,726      
Loan Evaluation, Collectively 599,205   369,684      
Loans 603,812   374,410      
ALLL Allocations, Individually 1,535   949      
ALLL Allocations, Collectively 6,192   3,648      
ALLL Allocations, Total ALLL 7,727 4,493 4,597 4,507 4,064 4,088
Consumer            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Individually 263   384      
Loan Evaluation, Collectively 28,512   30,747      
Loans 28,775   31,131      
ALLL Allocations, Individually 50   80      
ALLL Allocations, Collectively 620   703      
ALLL Allocations, Total ALLL 670 719 783 627 547 420
Mortgage warehouse            
Financing Receivable Allowance For Credit Losses [Line Items]            
Loan Evaluation, Collectively 343,028   297,830      
Loans 343,028   297,830      
ALLL Allocations, Collectively 343   297      
ALLL Allocations, Total ALLL $ 343 $ 285 $ 297 $ 229 $ 122 $ 182