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Commitments and Loss Contingencies - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Commitments and Contingencies |  |  |
Commitments to extend credit, fixed rate | $ 124,609,000 | $ 158,817,000 |
Commitments to extend credit, variable rate | 989,584,000 | 961,821,000 |
Commitment to extend credit, total | $ 1,114,193,000 | $ 1,120,638,000 |
Percentage of unused commitments to outstanding gross loans | 42.00% | 44.00% |
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expenses (Reduction) | $ 192,000 |  |
Off-balance sheet credit exposures | 1,078,000 |  | $ 679,000
Off-balance sheet, credit loss liability increase due to offsetting increase in loss factors in CECL model | 399,000 |  |
Restatement Adjustment | ASU 2016-03 - Topic 326 |  |  |
Commitments and Contingencies |  |  |
Off-balance sheet credit exposures | (207,000) | $ (207,000) |
Unused lines of credit and commitments to make loans |  |  |
Commitments and Contingencies |  |  |
Commitments to extend credit, fixed rate | 121,560,000 | 147,372,000 |
Commitments to extend credit, variable rate | 970,614,000 | 951,206,000 |
Commitment to extend credit, total | 1,092,174,000 | 1,098,578,000 |
Standby letters of credit |  |  |
Commitments and Contingencies |  |  |
Commitments to extend credit, fixed rate | 3,049,000 | 11,445,000 |
Commitments to extend credit, variable rate | 18,970,000 | 10,615,000 |
Commitment to extend credit, total | $ 22,019,000 | $ 22,060,000 |

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- Definition The fair value of financial assets, commitments to extend credit with fixed rates, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition The fair value of financial assets, commitments to extend credit with fixed and variable rates, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition The fair value of financial assets, commitments to extend credit with variable rates, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition The offsetting increase in allowance for losses for off-balance sheet credit exposures was driven by increased loss factors in the CECL model for all loan segments with off-balance sheet exposures which resulted from deterioration in the economic forecast assumptions used in the CECL model. + References No definition available. + Details
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- Definition Percentage of unused commitments to outstanding gross loans. + References No definition available. + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446 + Details
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