Loans and Allowance for Credit Losses (Narrative) (Details)		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022 USD ($) Loan	Jun. 30, 2021 USD ($) Loan	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Accrued interest		$ 72,100,000				$ 67,800,000
Base line economic forecast probability percentage		25.00%
Unemployment percentage rate forecast		3.50%
Labor force participation forecast percentage		62.50%
Prime age employment to population ratio above		80.00%
Federal funds rate description		Federal Funds rate will reach a target of 2.25% or 2.50% by the end of 2022
Nonaccrual loans		$ 38,066,000				55,523,000
TDRs both accruing and nonaccruing		5,700,000				10,600,000
Unfunded commitment to borrowers related to modified TDR		0				0
Loans held for sale		44,253,000				93,069,000
Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		3,200,000				6,800,000
Reduced interest rate		100,000
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]
Accounts Notes And Loans Receivable [Line Items]
Extended terms and other payment concessions			$ 7,100,000
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts Notes And Loans Receivable [Line Items]
Other modifications		$ 100,000	$ 300,000
Slower Near Term Growth S-2 [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses probability weighting percentage		75.00%
Downside Scenario S-1 [Member]
Accounts Notes And Loans Receivable [Line Items]
Weighted average percentage of forecast			65.00%
Downside Scenario S-2 [Member]
Accounts Notes And Loans Receivable [Line Items]
Weighted average percentage of forecast			35.00%
Forecast [Member]
Accounts Notes And Loans Receivable [Line Items]
Unemployment percentage rate forecast	6.50%
Gross domestic product grow percentage				2.60%	2.70%
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		$ 20,362,000				25,439,000
Loans carried at fair value option		21,500,000				41,000,000.0
Unpaid principal balance		21,100,000				40,100,000
Residential Mortgages [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | Loan			1
Recorded Investment			$ 600,000
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		7,885,000				11,887,000
Real estate in process of foreclosure		4,700,000				4,400,000
Real estate acquired through foreclosure		$ 400,000				2,400,000
Consumer [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | Loan		1
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		$ 7,223,000				11,895,000
Commercial Non-Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Paycheck protection program loans		$ 151,300,000				531,100,000
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | Loan		3
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans interest bearing rate		1.00%
Loans receivable percentage of origination fee description		These loans also earn an origination fee of 1%, 3%, or 5%, depending on the loan size,
Nonaccrual loans		$ 4,829,000				$ 6,974,000
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Minimum [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans term		2 years
Loans percentage of origination fee		1.00%
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Maximum [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans term		5 years
Loans percentage of origination fee		5.00%
Commercial Non-Real Estate and Consumer [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment		$ 3,100,000