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Off-Balance Sheet Commitments (Tables) | 12 Months Ended
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Dec. 31, 2020
Risks And Uncertainties [Abstract] |
Distribution of Undisbursed Loan Commitments | The following table shows the distribution of undisbursed loan commitments as of the dates indicated:
|  | December 31, |
|  | 2020 |  |  | 2019 |
|  | (in thousands) |
Commitments to extend credit |  | $ | 453,900 |  |  | $ | 371,287 |
Standby letters of credit |  |  | 47,169 |  |  |  | 31,372 |
Commercial letters of credit |  |  | 54,547 |  |  |  | 11,133 |
Total undisbursed loan commitments |  | $ | 555,616 |  |  | $ | 413,792 |
Allowance for Credit Losses Related to Off-Balance Sheet Items | Activity in the allowance for credit losses related to off-balance sheet items was as follows for the periods indicated:
|  | As of and for the Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Balance at beginning of period |  | $ | 2,397 |  |  | $ | 1,439 |  |  | $ | 1,296 |
Adjustment related to adoption of ASU 2016-13 |  |  | (335 | ) |  |  | — |  |  |  | — |
Adjusted balance |  | $ | 2,062 |  |  |  | 1,439 |  |  |  | 1,296 |
Provision expense for credit losses |  |  | 730 |  |  |  | 958 |  |  |  | 143 |
Balance at end of period |  | $ | 2,792 |  |  | $ | 2,397 |  |  | $ | 1,439 |

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- Definition Tabular disclosure of allowance for credit loss on securities borrowed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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