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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Recently Issued or Adopted Accounting Pronouncements (Details) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating lease assets |  | $ 27,600,000 | $ 18,000,000 |  |  |  |
Operating lease liabilities |  | 28,841,000 | 19,300,000 |  |  |  |
Total stockholders’ equity |  | 854,432,000 | 820,439,000 |  | $ 809,311,000 |  | $ 760,723,000
ACL on investment securities available for sale |  | 0 | 0 |  | 0 |  |
Allowance for credit losses on loans |  | 42,361,000 | 70,185,000 |  | $ 36,171,000 |  | 35,042,000
ACL on loans as percentage of loans receivable |  |  |  | 1.01% | 0.96% |  |
Net discount for PCD loans |  |  |  | $ 4,300,000 |  |  |
Total net discount for purchased loans |  |  |  | 10,000,000 | $ 8,400,000 |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,800,000 |  |  |
Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total stockholders’ equity |  | 293,238,000 | 224,400,000 |  | 212,474,000 |  | 176,372,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total stockholders’ equity | [1] |  |  |  | (5,615,000) |  | (399,000)
Allowance for credit losses on loans |  |  | 0 |  | 1,822,000 |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total stockholders’ equity | [1] |  |  |  | $ (5,615,000) |  | (399,000)
UNITED STATES |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Investment securities (as a percent) |  |  |  |  | 0.835 |  |
State and Local Jurisdiction |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Investment securities (as a percent) |  |  |  |  | 0.140 |  |
Total Allowance for Credit Losses |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Impact of CECL Adoption |  |  |  | 3,400,000 |  |  |
Unused Commitments to Extend Credit |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  | $ 2,607,000 | 4,681,000 |  | $ 306,000 |  | 306,000
Impact of CECL Adoption |  |  |  | 3,700,000 |  |  |
Unused Commitments to Extend Credit | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 0 |  | 3,702,000 |  | $ 0
Purchase Credit Impaired Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,600,000 |  |  |
ASU 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating lease assets |  |  |  |  |  | $ 29,300,000 |
Operating lease liabilities |  |  |  |  |  | $ 30,200,000 |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Impact of CECL Adoption |  |  |  | 5,600,000 |  |  |
Pretax cumulative effect adjustment |  |  |  | 7,100,000 |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Impact of CECL Adoption |  |  |  |  | $ 1,822,000 |  |
Accounting Standards Update 2018-13 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase (decrease) in net discount for PCD loans |  |  |  | $ 1,600,000 |  |  |
[1] | Effective January 1, 2019, the Bank adopted ASU 2016-02, Leases.

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