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Investment Securities (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Security
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Security
Schedule Of Investments [Line Items]          
Securities pledged as collateral $ 715,300,000   $ 715,300,000   $ 567,400,000
Number of security positions, unrealized loss position | Security 65   65   8
Number of security positions, unrealized loss position for more than 12 months | Security 3   3   1
Securities, 12 months or longer, Fair Value $ 3,637,000   $ 3,637,000   $ 8,000
Securities, 12 months or longer, Unrealized Losses $ 64,000   $ 64,000    
Number of security positions, unrealized loss position for less than 12 months | Security 62   62   7
Securities, less than 12 months, Fair Value $ 472,722,000   $ 472,722,000   $ 29,087,000
Securities, less than 12 months, Unrealized Losses 6,043,000   6,043,000   68,000
Available for sale securities, allowance for credit loss 0   0   0
Debt securities, held-to-maturity 218,864,000   218,864,000   271,973,000
Investment securities, past due 5,000,000   5,000,000   7,994,000
Investment securities, nonaccrual 6,593,000   6,593,000   9,286,000
Municipal Bonds [Member]          
Schedule Of Investments [Line Items]          
Debt securities, held-to-maturity 107,100,000   107,100,000   135,700,000
Internally rated held-to-maturity securities 6,000,000.0   6,000,000.0   8,500,000
Municipal Bonds [Member] | Below Investment Grade [Member]          
Schedule Of Investments [Line Items]          
Investment grade rating exposure 280,000   $ 280,000   $ 279,000
Investment grade rating exposure percentage     0.25%   0.19%
Maximum [Member]          
Schedule Of Investments [Line Items]          
Securities, 12 months or longer, Unrealized Losses 64,000   $ 64,000   $ 1,000
Available for Sale Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 1,600,000   1,600,000   1,200,000
Held To Maturity Investment Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 751,000   751,000   905,000
Investment securities, past due 0   0   0
Investment securities, nonaccrual 0   0   $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member]          
Schedule Of Investments [Line Items]          
Credit loss expense $ (1,000) $ (5,000) $ (1,000) $ (6,000)