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Investment Securities (Narrative) (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
Security
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Security
Schedule Of Investments [Line Items]      
Securities pledged as collateral $ 1,020,000,000.00   $ 637,600,000
Number of security positions, unrealized loss position | Security 394   116
Number of security positions, unrealized loss position for more than 12 months | Security 50   28
Securities, 12 months or longer, Fair Value $ 296,908,000   $ 172,180,000
Securities, 12 months or longer, Unrealized Losses $ 30,137,000   $ 4,727,000
Number of security positions, unrealized loss position for less than 12 months | Security 344   88
Securities, Less than 12 months, Fair Value $ 803,267,000   $ 773,484,000
Securities, Less than 12 months, Unrealized Losses 51,729,000   10,039,000
Available for sale securities, allowance for credit loss 0   0
Debt securities, held-to-maturity 211,179,000   205,586,000
Investment securities, past due 3,682,988,000   3,631,355,000
Investment securities, nonaccrual 9,124,000   11,369,000
Total Past Due [Member]      
Schedule Of Investments [Line Items]      
Investment securities, past due 20,579,000   9,467,000
Municipal Bonds [Member]      
Schedule Of Investments [Line Items]      
Debt securities, held-to-maturity 117,500,000   105,600,000
Internally rated held-to-maturity securities 6,000.0   5,800
Maximum [Member]      
Schedule Of Investments [Line Items]      
Securities, 12 months or longer, Unrealized Losses 30,100   4,700
Available for Sale Securities [Member]      
Schedule Of Investments [Line Items]      
Accrued interest receivable 2,200,000   2,100,000
Held To Maturity Investment Securities [Member]      
Schedule Of Investments [Line Items]      
Accrued interest receivable 1,100,000   696,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member]      
Schedule Of Investments [Line Items]      
Investment securities, past due 0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]      
Schedule Of Investments [Line Items]      
Credit loss expense $ (1,000) $ (1,000)