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Loans and Allowance for Credit Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | $ 58,144,000
Unpaid principal balances |  |  | 64,556,000
Valuation allowance |  |  | 3,281,000
Impaired Financing Receivable, Average Recorded Investment |  | $ 89,575,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | $ 0 | 87,000 |
Currently performing impaired loans | 39,700,000 |  | 35,800,000
Nonaccrual loans | $ 713,000 | 1,600,000 |
Impaired loans with an allowance: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 35,758,000
Unpaid principal balances |  |  | 40,305,000
Valuation allowance |  |  | 3,281,000
Impaired Financing Receivable, Average Recorded Investment |  | 49,001,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans with an allowance: | Commercial real estate – mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 9,998,000
Unpaid principal balances |  |  | 10,983,000
Valuation allowance |  |  | 1,235,000
Impaired Financing Receivable, Average Recorded Investment |  | 16,327,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans with an allowance: | Consumer real estate – mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 20,996,000
Unpaid principal balances |  |  | 23,105,000
Valuation allowance |  |  | 1,293,000
Impaired Financing Receivable, Average Recorded Investment |  | 22,266,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans with an allowance: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 542,000
Unpaid principal balances |  |  | 654,000
Valuation allowance |  |  | 33,000
Impaired Financing Receivable, Average Recorded Investment |  | 724,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans with an allowance: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 4,074,000
Unpaid principal balances |  |  | 5,381,000
Valuation allowance |  |  | 711,000
Impaired Financing Receivable, Average Recorded Investment |  | 9,027,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans with an allowance: | Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 148,000
Unpaid principal balances |  |  | 182,000
Valuation allowance |  |  | 9,000
Impaired Financing Receivable, Average Recorded Investment |  | 657,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans without an allowance: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 22,386,000
Unpaid principal balances |  |  | 24,251,000
Valuation allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment |  | 40,574,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 87,000 |
Impaired loans without an allowance: | Commercial real estate – mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 8,124,000
Unpaid principal balances |  |  | 8,891,000
Valuation allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment |  | 15,699,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 87,000 |
Impaired loans without an allowance: | Consumer real estate – mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 4,022,000
Unpaid principal balances |  |  | 4,021,000
Valuation allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment |  | 8,839,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans without an allowance: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 19,000
Unpaid principal balances |  |  | 17,000
Valuation allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment |  | 893,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans without an allowance: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 10,221,000
Unpaid principal balances |  |  | 11,322,000
Valuation allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment |  | 15,143,000 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | 0 |
Impaired loans without an allowance: | Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 0
Unpaid principal balances |  |  | 0
Valuation allowance |  |  | $ 0
Impaired Financing Receivable, Average Recorded Investment |  | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method |  | $ 0 |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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