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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,041,271 | $ 1,040,256 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loan balance | 7,168,745 | 7,177,785 |  |
Financing Receivable, Allowance for Credit Loss | 86,886 | 85,675 | $ 61,503 | $ 56,679
Off-Balance Sheet, Credit Loss, Liability | 4,066 | 116 |  |
Deferred Tax Liabilities, Net |  | 2,892 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,041,271 | 1,040,256 |  |
Accrued Investment Income Receivable | 3,900 |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 19,700 | 20,653 |  |
Retained Earnings [Member] |  |  |  |
Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 719,230 | 704,764 | 649,636 | 646,847
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 719,230 | 704,764 | $ 649,636 | $ 646,847
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 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loan balance |  | 7,177,666 |  |
Financing Receivable, Allowance for Credit Loss |  | 91,765 |  |
Off-Balance Sheet, Credit Loss, Liability |  | 3,982 |  |
Deferred Tax Liabilities, Net |  | 777 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 1,032,300 |  |
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 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 696,808 |  |
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) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loan balance |  | (119) |  |
Financing Receivable, Allowance for Credit Loss |  | 6,090 |  |
Off-Balance Sheet, Credit Loss, Liability |  | 3,866 |  |
Deferred Tax Liabilities, Net |  | (2,115) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | (7,956) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | $ 52 |  |  |
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) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | (7,956) |  |
Commercial Real Estate [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 23,480 |  |
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 |  |
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) |  |
Consumer [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 17,418 |  |
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 |  |
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) |  |
Commercial, Financial, and Agricultural [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 25,608 |  |
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 |  |
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 |  |
Construction Real Estate [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 7,288 |  |
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 |  |
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 |  |
Residential Real Estate [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 11,363 |  |
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 |  |
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) |  |
Finance Leases Portfolio Segment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 518 |  |
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 |  |
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) |  |

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