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Recent Accounting Pronouncements (Details) - USD ($) | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,067,912,000 |  |  | $ 1,040,256,000 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Loan balance | 6,908,417,000 |  |  | 7,177,785,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss | 88,129,000 | $ 83,577,000 |  | 85,675,000 | $ 87,038,000 | $ 73,476,000 |  | $ 56,679,000
Off-Balance Sheet, Credit Loss, Liability | 4,642,000 |  |  | 116,000 |  |  |  |
Deferred Tax Liabilities, Net |  |  |  | 2,892,000 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,067,912,000 |  |  | 1,040,256,000 |  |  |  |
Accrued Investment Income Receivable | 5,300,000 |  |  |  |  |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 18,400,000 |  |  | 20,653,000 |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 759,619,000 | 741,155,000 | $ 719,230,000 | 704,764,000 | 676,465,000 | 662,311,000 | $ 649,636,000 | 646,847,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 759,619,000 | $ 741,155,000 | $ 719,230,000 | 704,764,000 | $ 676,465,000 | $ 662,311,000 | $ 649,636,000 | $ 646,847,000
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | 1,032,300,000 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Loan balance |  |  |  | 7,177,666,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 91,765,000 |  |  |  |
Off-Balance Sheet, Credit Loss, Liability |  |  |  | 3,982,000 |  |  |  |
Deferred Tax Liabilities, Net |  |  |  | 777,000 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | 1,032,300,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Retained Earnings [Member] |  |  |  |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | 696,808,000 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | 696,808,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | (7,956,000) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Loan balance |  |  |  | (119,000) |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 6,090,000 |  |  |  |
Off-Balance Sheet, Credit Loss, Liability |  |  |  | 3,866,000 |  |  |  |
Deferred Tax Liabilities, Net |  |  |  | (2,115,000) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | (7,956,000) |  |  |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | $ 52,000 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings [Member] |  |  |  |  |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | (7,956,000) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | (7,956,000) |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 23,480,000 |  |  |  |
Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 25,599,000 |  |  |  |
Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (2,119,000) |  |  |  |
Consumer [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 17,418,000 |  |  |  |
Consumer [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 28,343,000 |  |  |  |
Consumer [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (10,925,000) |  |  |  |
Commercial, Financial, and Agricultural [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 25,608,000 |  |  |  |
Commercial, Financial, and Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 17,351,000 |  |  |  |
Commercial, Financial, and Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 8,257,000 |  |  |  |
Construction Real Estate [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 7,288,000 |  |  |  |
Construction Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 5,390,000 |  |  |  |
Construction Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 1,898,000 |  |  |  |
Residential Real Estate [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 11,363,000 |  |  |  |
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 14,484,000 |  |  |  |
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | (3,121,000) |  |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 518,000 |  |  |  |
Finance Leases Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 598,000 |  |  |  |
Finance Leases Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | $ (80,000) |  |  |  |

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