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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Recently Issued Accounting Pronouncements (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease assets | $ 18,000 |  | $ 23,000 |  |  |
Operating lease liabilities | 19,275 |  | 24,200 |  |  |
Allowance for credit losses on loans | 70,185 | $ 37,993 | $ 36,171 |  |  |
Accumulated Credit Losses to Loans Receivable Ratio |  | 1.01% | 0.96% |  |  |
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Balance |  | $ 4,300 |  |  |  |
Financing Receivable, Purchase, Discount (Premium) |  | 10,000 | $ 8,400 |  |  |
Total stockholders’ equity | 820,439 |  | 809,311 |  | $ 760,723 | $ 508,305
AOCI attributable to parent |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total stockholders’ equity | 25,018 |  | 10,378 |  | (7,455) | (1,298)
Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total stockholders’ equity | 224,400 |  | 212,474 |  | 176,372 | 149,013
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  | (5,615) |  | (399) | 0
Cumulative Effect, Period of Adoption, Adjustment | AOCI attributable to parent |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  | 0 |  | 0 | (93)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  | $ (5,615) |  | (399) | 93
State and Local Jurisdiction [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Issuance Percent |  |  | 0.140 |  |  |
UNITED STATES |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Issuance Percent |  |  | 0.835 |  |  |
Total Allowance for Credit Losses [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact of CECL Adoption |  | 3,400 |  |  |  |
Unused Commitments to Extend Credit [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact of CECL Adoption |  | 3,700 |  |  |  |
Allowance for credit losses on loans | $ 4,681 |  | $ 306 |  | 306 | 170
Unused Commitments to Extend Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 3,702 |  | $ 0 | $ 0
Purchase Credit Impaired Loans [Member] [Domain] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  | 1,600 |  |  |  |
Purchase Credit Impaired Loans [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  | 1,600 |  |  |  |
ASU 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease assets |  |  |  | $ 29,300 |  |
Operating lease liabilities |  |  |  | $ 30,200 |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact of CECL Adoption |  | 5,600 |  |  |  |
Allowance for credit losses on loans |  | 1,800 |  |  |  |
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Change |  | 1,600 |  |  |  |
Cumulative Effect Of New Accounting Principle In Period Of Adoption PreTax |  | $ 7,100 |  |  |  |

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