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Loans Receivable and Allowance for Credit Losses - Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | $ 25,668 | $ 24,098 | $ 10,310 | $ 9,952 | $ 9,929 | $ 9,905
Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 11,236 |  | 6,043 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 14,432 |  | 4,267 |  |  |
Allowance for credit loss | 25,668 |  | 10,310 |  |  |
Individually evaluated for impairment | 29,758 |  | 18,916 |  |  |
Collectively evaluated for impairment, amount | 860,134 |  | 829,400 |  |  |
Loans receivable, gross | 889,892 |  | 848,316 |  |  |
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 13,360 | 10,039 | 6,966 | 6,787 | 4,980 | 5,063
Commercial Real Estate | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 10,409 |  | 5,430 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 2,951 |  | 1,536 |  |  |
Allowance for credit loss | 13,360 |  | 6,966 |  |  |
Individually evaluated for impairment | 21,616 |  | 11,241 |  |  |
Collectively evaluated for impairment, amount | 477,516 |  | 426,202 |  |  |
Loans receivable, gross | 499,132 |  | 437,443 |  |  |
Residential Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 1,088 | 1,027 | 665 | 468 | 1,395 | 1,700
Residential Real Estate | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 293 |  | 5 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 795 |  | 660 |  |  |
Allowance for credit loss | 1,088 |  | 665 |  |  |
Individually evaluated for impairment | 1,623 |  | 2,508 |  |  |
Collectively evaluated for impairment, amount | 110,977 |  | 121,632 |  |  |
Loans receivable, gross | 112,600 |  | 124,140 |  |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 1,408 | 1,673 | 1,403 | 1,838 | 2,316 | 2,532
Commercial and Industrial | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 534 |  | 608 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 874 |  | 795 |  |  |
Allowance for credit loss | 1,408 |  | 1,403 |  |  |
Individually evaluated for impairment | 6,040 |  | 4,653 |  |  |
Collectively evaluated for impairment, amount | 154,456 |  | 134,134 |  |  |
Loans receivable, gross | 160,496 |  | 138,787 |  |  |
Consumer and Other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 9,696 | 11,275 | 1,207 | 739 | 1,063 | 253
Consumer and Other | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 9,696 |  | 1,207 |  |  |
Allowance for credit loss | 9,696 |  | 1,207 |  |  |
Individually evaluated for impairment | 0 |  | 514 |  |  |
Collectively evaluated for impairment, amount | 111,411 |  | 140,577 |  |  |
Loans receivable, gross | 111,411 |  | 141,091 |  |  |
Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 2 | 33 | 24 | 38 | 58 | 78
Construction | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 2 |  | 24 |  |  |
Allowance for credit loss | 2 |  | 24 |  |  |
Individually evaluated for impairment | 479 |  | 0 |  |  |
Collectively evaluated for impairment, amount | 3,311 |  | 4,922 |  |  |
Loans receivable, gross | 3,790 |  | 4,922 |  |  |
Construction to Permanent - CRE |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 114 | 51 | 10 | 5 | 15 | 41
Construction to Permanent - CRE | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 114 |  | 10 |  |  |
Allowance for credit loss | 114 |  | 10 |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment, amount | 2,463 |  | 1,933 |  |  |
Loans receivable, gross | 2,463 |  | 1,933 |  |  |
Unallocated |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss | 0 | $ 0 | 35 | $ 77 | $ 102 | $ 238
Unallocated | Business Activities Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for credit losses, collectively evaluated for impairment | 0 |  | 35 |  |  |
Allowance for credit loss | 0 |  | 35 |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment, amount | 0 |  | 0 |  |  |
Loans receivable, gross | $ 0 |  | $ 0 |  |  |

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