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Loans and Allowance for Credit Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Loan | Dec. 31, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan
Accounts Notes And Loans Receivable [Line Items] |  |  |
Accrued interest | $ 100,200,000 | $ 67,800,000 |
Related party balances of loans | 30,400,000 | 62,900,000 |
Related party new loans | 3,000,000.0 |  |
Related party repayments | 35,300,000 |  |
Short-term borrowings | $ 1,871,271,000 | $ 1,665,061,000 |
Percentage of baseline economic forecast | 25.00% |  |
Weighted average percentage of forecast |  | 40.00% |
Loans held for sale (includes $10,853 and $41,022 measured at fair value) | $ 26,385,000 | $ 93,069,000 |
Provision for credit losses | (28,399,000) | (77,494,000) | $ 602,904,000
Nonaccrual loans | 38,991,000 | 55,523,000 |
TDRs both accruing and nonaccruing | 4,500,000 | 10,600,000 |
Unfunded commitment to borrowers related to modified TDR | 0 | 0 |
Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 2,600,000 | 6,800,000 |
Reduced interest rate | 100,000 | 500,000 | 1,100,000
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 | 1,000,000.0
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Other modifications | $ 100,000 | $ 1,200,000 | 2,100,000
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Covenant waivers |  |  | $ 400,000
Slower Near Term Growth S-2 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Weighted average percentage of forecast |  | 60.00% |
Downside Recessionary S-2 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Percentage of baseline economic forecast | 75.00% |  |
FHLB Borrowings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Short-term borrowings | $ 1,425,000,000 | $ 1,100,000,000 |
Residential Mortgages [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 25,269,000 | $ 25,439,000 |
Loans carried at fair value option | 10,800,000 |  |
Unpaid principal balance | $ 10,600,000 |  |
Residential Mortgages [Member] | Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | Loan | 2 | 1 | 2
Recorded Investment |  | $ 600,000 | $ 800,000
Consumer [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | $ 6,692,000 | 11,887,000 |
Real estate in process of foreclosure | 4,900,000 | 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 | 4 |  | 1
Recorded Investment | $ 300,000 |  | $ 100,000
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 5,481,000 | 11,895,000 |
Commercial Non Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Paycheck protection program loans | $ 38,800,000 | 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 |  | 2
Recorded Investment | $ 3,100,000 |  | $ 13,400,000
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 | $ 4,020,000 | $ 6,974,000 |
Commercial Non Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] | Minimum [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] | Total Commercial [Member] | Maximum [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans term | 5 years |  |
Loans percentage of origination fee | 5.00% |  |

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