Allowance For Credit Losses (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	$ 7,305,099,000			$ 7,058,897,000
Loan balance	7,349,745,000			7,141,891,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,085,564,000			1,069,226,000
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	84,602,000	$ 87,206,000		85,379,000	$ 83,961,000	$ 81,448,000		$ 83,197,000
Retained Earnings [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	896,627,000	$ 876,830,000	$ 862,518,000	847,235,000	$ 839,207,000	$ 814,241,000	$ 797,033,000	$ 776,294,000
PPP loans receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance	$ 2,427,000			4,206,000
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest				383,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest				383,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 [Member] | Retained Earnings [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				$ 303,000