Recent Accounting Pronouncements (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 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	$ 1,069,392,000		$ 1,040,256,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loan balance	7,035,646,000		7,177,785,000
Financing Receivable, Allowance for Credit Loss	83,577,000	$ 86,886,000	85,675,000	$ 73,476,000	$ 61,503,000	$ 56,679,000
Off-Balance Sheet, Credit Loss, Liability	4,402,000		116,000
Deferred Tax Liabilities, Net			2,892,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,069,392,000		1,040,256,000
Accrued Investment Income Receivable	5,000,000.0
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	18,100,000		20,653,000
Retained Earnings [Member]
Accounting Standards Update and Change in Accounting Principle [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	741,155,000	719,230,000	704,764,000	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	741,155,000	$ 719,230,000	704,764,000	$ 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)