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Loans and Allowance for Probable Loan Losses - Impaired Loans by Class of Loan (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance [1] $ 40,143 $ 47,274
Recorded Investment [1] 35,045 44,267
Related Allowance for Loan Losses [1] 2,369 5,908
PCI loans that experienced deterioration in credit quality subsequent to acquisition 9,100 8,000
Construction Real Estate Loans    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 356 182
Recorded Investment 323 148
Related Allowance for Loan Losses 23 13
1-4 Family Residential Real Estate Loans    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 8,646 6,507
Recorded Investment 7,491 5,923
Related Allowance for Loan Losses 66 40
Commercial Real Estate Loans    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 26,198 36,457
Recorded Investment 22,999 34,744
Related Allowance for Loan Losses 1,408 5,337
Commercial loans    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 4,033 2,874
Recorded Investment 3,449 2,366
Related Allowance for Loan Losses 782 368
Municipal loans    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 429 429
Recorded Investment 429 429
Related Allowance for Loan Losses 0 1
Loans to individuals    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 481 825
Recorded Investment 354 657
Related Allowance for Loan Losses $ 90 $ 149
[1]
Includes $9.1 million and $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date as of June 30, 2019 and December 31, 2018, respectively.