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)