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Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | $ 71,727
Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 48,618
Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 19,100
Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 4,009
Real Estate | Construction and development |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 1,538
Real Estate | Construction and development | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 1,538
Real Estate | Construction and development | Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Real Estate | Construction and development | Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Real Estate | Single family residential |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 6,722
Real Estate | Single family residential | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 6,722
Real Estate | Single family residential | Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Real Estate | Single family residential | Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Real Estate | Other commercial |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 40,358
Real Estate | Other commercial | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 40,358
Real Estate | Other commercial | Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Real Estate | Other commercial | Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Commercial | Commercial |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 23,109
Commercial | Commercial | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 0
Commercial | Commercial | Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 19,100
Commercial | Commercial | Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | $ 4,009

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