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Fair Value Disclosures - Fair Value of Assets Measured on Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 12,220	$ 17,047
Impaired Loans | 1-4 family residential properties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	85	7
Impaired Loans | Construction, land development, land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		252
Impaired Loans | Commercial Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	7,785	12,921
Impaired Loans | Factored receivables
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	3,777	1,630
Impaired Loans | Consumer
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	191
Impaired Loans | Commercial real estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	42	417
Impaired Loans | PCI
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		170
Other real estate owned | 1-4 family residential properties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		485
Other real estate owned | Construction, land development, land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	202	467
Other real estate owned | Commercial real estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	138	698
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	12,220	17,047
Level 3 | Impaired Loans | 1-4 family residential properties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	85	7
Level 3 | Impaired Loans | Construction, land development, land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		252
Level 3 | Impaired Loans | Commercial Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	7,785	12,921
Level 3 | Impaired Loans | Factored receivables
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	3,777	1,630
Level 3 | Impaired Loans | Consumer
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	191
Level 3 | Impaired Loans | Commercial real estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	42	417
Level 3 | Impaired Loans | PCI
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		170
Level 3 | Other real estate owned | 1-4 family residential properties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		485
Level 3 | Other real estate owned | Construction, land development, land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	202	467
Level 3 | Other real estate owned | Commercial real estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 138	$ 698

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