Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Accrued interest		$ 71,500					$ 76,200
Weighted average percentage of forecast		65.00%
Nonaccrual loans		$ 83,551					139,879
TDRs both accruing and nonaccruing		10,600					25,800
Unfunded commitment to borrowers related to modified TDR		1,400					4,600
Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		6,800					21,600
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	$ 700
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]
Accounts Notes And Loans Receivable [Line Items]
Other modifications		$ 300	1,800
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]
Accounts Notes And Loans Receivable [Line Items]
Covenant waivers			$ 400
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	4.50%			3.50%	3.70%	5.40%
Gross domestic product weighted average				2.30%	5.00%	6.90%
Federal reserve rate				0.00%
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		$ 32,775					40,573
Residential Mortgages [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | loan		1	1
Recorded Investment		$ 600	$ 600
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | loan			1
Recorded Investment			$ 400
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		16,464					23,385
Real estate in process of foreclosure		8,300					17,200
Real estate acquired through foreclosure		4,500					3,400
Consumer [Member] | Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs subsequently defaulted | loan			2
Recorded Investment			$ 200
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans		27,239					66,692
Commercial Non-Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Paycheck protection program loans		$ 1,400,000					2,000,000
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		$ 19,124					$ 52,836
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%