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Investment Securities (Narrative) (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
Security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Security
Schedule Of Investments [Line Items]      
Securities pledged as collateral $ 891,500,000   $ 850,400,000
Sales of securities available for sale $ 0 $ 0  
Number of security positions, unrealized loss position | Security 222   226
Number of security positions, unrealized loss position for more than 12 months | Security 189   127
Securities, 12 months or longer, Fair Value $ 935,964,000   $ 760,210,000
Securities, 12 months or longer, Unrealized Losses $ 158,232,000   $ 155,102,000
Number of security positions, unrealized loss position for less than 12 months | Security 33   99
Securities, Less than 12 months, Fair Value $ 9,112,000   $ 193,800,000
Securities, Less than 12 months, Unrealized Losses 520,000   17,922,000
Available for sale securities, allowance for credit loss 0   0
Securities held to maturity, Amortized Cost 180,057,000   188,980,000
Investment securities, nonaccrual 8,797,000   10,197,000
Municipal Bonds [Member]      
Schedule Of Investments [Line Items]      
Securities held to maturity, Amortized Cost 87,300,000   90,600,000
Internally rated held-to-maturity securities 6,000,000.0   6,900,000
Held To Maturity Securities Non Rated 400,000    
Available for Sale Securities [Member]      
Schedule Of Investments [Line Items]      
Accrued interest receivable 2,000,000.0   2,100,000
Held To Maturity Investment Securities [Member]      
Schedule Of Investments [Line Items]      
Accrued interest receivable 1,000,000.0   695,000
Investment securities, nonaccrual 0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]      
Schedule Of Investments [Line Items]      
Credit loss expense $ 1,000 $ 1,000