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Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Allowance for Credit Losses on Basis of Impairment Method (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total | $ 27,002 | $ 26,107 | $ 25,854 | $ 25,918 | $ 25,988 | $ 25,196
Total Loans | 2,217,393 |  | 2,172,063 |  |  |
SBA held for investment including PPP loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 501 |  | 348 |  |  |
Collectively evaluated for impairment | 816 |  | 873 |  |  |
Total | 1,317 |  | 1,221 |  |  |
Individually evaluated for impairment | 3,646 |  | 3,444 |  |  |
Collectively evaluated for impairment | 35,851 |  | 37,458 |  |  |
Total Loans | 39,497 |  | 40,902 |  |  |
SBA loans held for investment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total | 1,317 | 1,457 | 1,221 | 1,656 | 1,556 | 875
Total Loans | 37,904 |  | 38,584 |  |  |
Commercial loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 469 |  | 341 |  |  |
Collectively evaluated for impairment | 17,105 |  | 15,535 |  |  |
Total | 17,574 | 16,688 | 15,876 | 15,351 | 15,516 | 15,254
Individually evaluated for impairment | 3,674 |  | 1,948 |  |  |
Collectively evaluated for impairment | 1,365,089 |  | 1,275,512 |  |  |
Total Loans | 1,368,763 |  | 1,277,460 |  |  |
Residential mortgage loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 301 |  | 306 |  |  |
Collectively evaluated for impairment | 6,133 |  | 6,223 |  |  |
Total | 6,434 | 6,213 | 6,529 | 6,431 | 6,437 | 5,450
Individually evaluated for impairment | 5,053 |  | 11,272 |  |  |
Collectively evaluated for impairment | 618,476 |  | 620,234 |  |  |
Total Loans | 623,529 |  | 631,506 |  |  |
Consumer loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 799 |  | 1,022 |  |  |
Total | 799 | 835 | 1,022 | 960 | 845 | 990
Individually evaluated for impairment | 100 |  | 388 |  |  |
Collectively evaluated for impairment | 72,191 |  | 72,288 |  |  |
Total Loans | 72,291 |  | 72,676 |  |  |
Residential construction loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Collectively evaluated for impairment | 878 |  | 1,206 |  |  |
Total | 878 | $ 914 | 1,206 | $ 1,520 | $ 1,634 | $ 2,627
Individually evaluated for impairment | 547 |  | 2,141 |  |  |
Collectively evaluated for impairment | 98,145 |  | 129,136 |  |  |
Total Loans | 98,692 |  | 131,277 |  |  |
Total loans held for investment including PPP |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total Loans | 2,202,772 |  | 2,153,821 |  |  |
Total loans held for investment excluding SBA PPP |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 1,271 |  | 995 |  |  |
Collectively evaluated for impairment | 25,731 |  | 24,859 |  |  |
Total | 27,002 |  | 25,854 |  |  |
Individually evaluated for impairment | 13,020 |  | 19,193 |  |  |
Collectively evaluated for impairment | 2,189,752 |  | 2,134,628 |  |  |
Total Loans | $ 2,202,772 |  | $ 2,153,821 |  |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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