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Investment Securities (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Security
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Security
Schedule Of Investments [Line Items]          
Securities pledged as collateral $ 866,400,000   $ 866,400,000   $ 637,800,000
Number of security positions, unrealized loss position | Security 226   226   116
Number of security positions, unrealized loss position for more than 12 months | Security 101   101   28
Securities, 12 months or longer, Fair Value $ 602,243,000   $ 602,243,000   $ 172,180,000
Securities, 12 months or longer, Unrealized Losses $ 133,550,000   $ 133,550,000   $ 4,727,000
Number of security positions, unrealized loss position for less than 12 months | Security 125   125   88
Securities, Less than 12 months, Fair Value $ 362,944,000   $ 362,944,000   $ 773,484,000
Securities, Less than 12 months, Unrealized Losses 50,739,000   50,739,000   10,039,000
Available for sale securities, allowance for credit loss 0   0   0
Securities held to maturity, Amortized Cost 197,543,000   197,543,000   205,586,000
Investment securities, past due 3,814,783,000   3,814,783,000   3,631,355,000
Investment securities, nonaccrual 7,550,000   7,550,000   11,369,000
Total Past Due [Member]          
Schedule Of Investments [Line Items]          
Investment securities, past due 13,247,000   13,247,000   9,467,000
Municipal Bonds [Member]          
Schedule Of Investments [Line Items]          
Securities held to maturity, Amortized Cost 94,700,000   94,700,000   105,600,000
Internally rated held-to-maturity securities 6,900,000   6,900,000   5,800,000
Held To Maturity Securities Non Rated 800,000   800,000    
Held to maturity securities non rated debt maturities year one 600,000   600,000    
Held to maturity securities non rated debt maturities year two 200,000   200,000    
Maximum [Member]          
Schedule Of Investments [Line Items]          
Securities, 12 months or longer, Unrealized Losses 133,500,000   133,500,000   4,700,000
Available for Sale Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 2,100,000   2,100,000   2,100,000
Held To Maturity Investment Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 1,000,000.0   1,000,000.0   696,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member]          
Schedule Of Investments [Line Items]          
Investment securities, past due 0   0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]          
Schedule Of Investments [Line Items]          
Credit loss expense $ 1,000 $ 1,000 $ 1,000 $ 2,000