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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  | $ 22,874 |  | $ 22,874 |  |  |  |
Impact of CECL adoption |  |  |  |  | $ 5,450 | (1,449) |  | $ 4,594 |  | $ 900
Provision (reversal) - CECL method |  | $ 856 |  |  |  | 1,449 |  | (4,594) |  | (900)
Initial allowance for PCD loans |  |  |  |  |  | 1,505 |  |  |  |
(Charge-offs) |  | (1) |  |  |  | (5) |  |  |  |
Recoveries |  | 14 |  |  |  | 98 |  |  |  |
Ending balance |  | 22,874 | [1] | $ 22,113 |  | 23,023 | [1] | 22,874 | [1] |
Beginning balance |  | 22,113 |  |  | 16,677 |  |  | 16,677 |  | 15,821
(Charge-offs) |  |  |  |  | (30) |  |  |  |  | (78)
Recoveries |  |  |  |  | 16 |  |  |  |  | 34
Ending balance |  |  |  |  | $ 22,113 |  |  |  |  | $ 16,677
Accounting Standards Update [Extensible List] |  |  |  | Accounting Standards Update 2016-13 | Accounting Standards Update 2016-13 |  |  |  |  | Accounting Standards Update 2016-13
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,604 |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | $ 1,604 |  |  |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 2,530 |  | 2,530 |  |  |  |
Impact of CECL adoption |  |  |  |  | 208 |  |  |  |  | $ (49)
Provision (reversal) - CECL method |  | (269) |  |  |  | 1,240 |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 405 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 14 |  |  |  | 14 |  |  |  |
Ending balance |  | 2,530 |  | 2,525 |  | 1,709 |  | 2,530 |  |
Beginning balance |  | 2,525 |  |  | 2,334 |  |  | 2,334 |  | 2,436
(Charge-offs) |  |  |  |  | (30) |  |  |  |  | (75)
Recoveries |  |  |  |  | 13 |  |  |  |  | 22
Ending balance |  |  |  |  | 2,525 |  |  |  |  | 2,334
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (278) |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | (278) |  |  |  |  |
Commercial real estate | Commercial real estate, owner-occupied |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,778 |  | 2,778 |  |  |  |
Impact of CECL adoption |  |  |  |  | 673 |  |  |  |  | 55
Provision (reversal) - CECL method |  | 495 |  |  |  | 561 |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 559 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 0 |  |  |  |
Ending balance |  | 2,778 |  | 3,135 |  | 2,776 |  | 2,778 |  |
Beginning balance |  | 3,135 |  |  | 2,462 |  |  | 2,462 |  | 2,407
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 0 |  |  |  |  | 0
Ending balance |  |  |  |  | 3,135 |  |  |  |  | 2,462
Commercial real estate | Commercial real estate, owner-occupied | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 138 |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | 138 |  |  |  |  |
Commercial real estate | Commercial real estate, investor-owned |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 12,682 |  | 12,682 |  |  |  |
Impact of CECL adoption |  |  |  |  | 3,141 |  |  |  |  | 768
Provision (reversal) - CECL method |  | 697 |  |  |  | 476 |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 533 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 0 |  |  |  |
Ending balance |  | 12,682 |  | 11,624 |  | 12,739 |  | 12,682 |  |
Beginning balance |  | 11,624 |  |  | 8,483 |  |  | 8,483 |  | 7,703
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 0 |  |  |  |  | 12
Ending balance |  |  |  |  | 11,624 |  |  |  |  | 8,483
Commercial real estate | Commercial real estate, investor-owned | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,755 |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | 1,755 |  |  |  |  |
Commercial real estate | Construction |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,557 |  | 1,557 |  |  |  |
Impact of CECL adoption |  |  |  |  | 219 |  |  |  |  | (118)
Provision (reversal) - CECL method |  | (496) |  |  |  | (62) |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 0 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 34 |  |  |  |
Ending balance |  | 1,557 |  | 860 |  | 1,653 |  | 1,557 |  |
Beginning balance |  | 860 |  |  | 638 |  |  | 638 |  | 756
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 3 |  |  |  |  | 0
Ending balance |  |  |  |  | 860 |  |  |  |  | 638
Commercial real estate | Construction | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 201 |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | 201 |  |  |  |  |
Residential loans | Home equity |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 738 |  | 738 |  |  |  |
Impact of CECL adoption |  |  |  |  | 188 |  |  |  |  | (65)
Provision (reversal) - CECL method |  | (61) |  |  |  | 193 |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 0 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 50 |  |  |  |
Ending balance |  | 738 |  | 1,038 |  | 595 |  | 738 |  |
Beginning balance |  | 1,038 |  |  | 850 |  |  | 850 |  | 915
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 0 |  |  |  |  | 0
Ending balance |  |  |  |  | 1,038 |  |  |  |  | 850
Residential loans | Home equity | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (361) |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | (361) |  |  |  |  |
Residential loans | Other residential |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 998 |  | 998 |  |  |  |
Impact of CECL adoption |  |  |  |  | 287 |  |  |  |  | 173
Provision (reversal) - CECL method |  | 50 |  |  |  | 360 |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 6 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 0 |  |  |  |
Ending balance |  | 998 |  | 1,260 |  | 644 |  | 998 |  |
Beginning balance |  | 1,260 |  |  | 973 |  |  | 973 |  | 800
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 0 |  |  |  |  | 0
Ending balance |  |  |  |  | 1,260 |  |  |  |  | 973
Residential loans | Other residential | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (212) |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | (212) |  |  |  |  |
Consumer loans | Installment and other consumer |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 291 |  | 291 |  |  |  |
Impact of CECL adoption |  |  |  |  | 122 |  |  |  |  | (23)
Provision (reversal) - CECL method |  | (11) |  |  |  | (333) |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 2 |  |  |  |
(Charge-offs) |  | (1) |  |  |  | (5) |  |  |  |
Recoveries |  | 0 |  |  |  | 0 |  |  |  |
Ending balance |  | 291 |  | 406 |  | 621 |  | 291 |  |
Beginning balance |  | 406 |  |  | 284 |  |  | 284 |  | 310
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | (3)
Recoveries |  |  |  |  | 0 |  |  |  |  | 0
Ending balance |  |  |  |  | 406 |  |  |  |  | 284
Consumer loans | Installment and other consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (125) |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | (125) |  |  |  |  |
Unallocated |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,300 |  | 1,300 |  |  |  |
Impact of CECL adoption |  |  |  |  | 612 |  |  |  |  | 159
Provision (reversal) - CECL method |  | 451 |  |  |  | (986) |  |  |  |
Initial allowance for PCD loans |  |  |  |  |  | 0 |  |  |  |
(Charge-offs) |  | 0 |  |  |  | 0 |  |  |  |
Recoveries |  | 0 |  |  |  | 0 |  |  |  |
Ending balance |  | 1,300 |  |  |  | $ 2,286 |  | 1,300 |  |
Beginning balance |  | 1,265 |  |  | 653 |  |  | $ 653 |  | 494
(Charge-offs) |  |  |  |  | 0 |  |  |  |  | 0
Recoveries |  |  |  |  | 0 |  |  |  |  | 0
Ending balance |  |  |  |  | 1,265 |  |  |  |  | $ 653
Unallocated | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 486 |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | $ 486 |  |  |  |  |
[1] | Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.

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