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Loans and Allowance for Loan Losses - Collateral Dependent Loans (Details) $ in Thousands | Mar. 31, 2020 USD ($)
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Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | $ 75,670
Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 23,648
Energy |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 43,573
Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 8,449
Real Estate | Construction and development |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 3,078
Real Estate | Construction and development | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 3,078
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 | 3,586
Real Estate | Single family residential | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 3,586
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 | 16,984
Real Estate | Other commercial | Real Estate Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | 16,984
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 | 52,022
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 | 43,573
Commercial | Commercial | Other Collateral |
Loans and Leases Receivable Disclosure [Line Items] |
Financing receivable, collateral dependent, amount | $ 8,449

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