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Investment Securities (Narrative) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments $ 0 $ 0  
Debt Securities, Available-for-sale, Amortized Cost 1,782,922,000   $ 1,854,852,000
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0   0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Debt Securities, Available for Sale, Sold at Gain, Amortized Cost Amount $ 0 $ 0  
Debt Securities, Available-for-sale 1,668,864,000   1,733,696,000
Debt Securities, Available-for-sale, Unrealized Loss Position 1,484,240,000   1,590,490,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 115,776,000   122,776,000
Securities Available-for-Sale, 12 months or longer, Fair value 1,279,229,000   413,070,000
U.S. Government Sponsored Entities Asset-Backed Securities [Member]      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 769,715,000   839,399,000
Debt Securities, Available-for-sale 687,378,000   756,761,000
Debt Securities, Available-for-sale, Unrealized Loss Position 687,378,000   756,761,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 82,337,000   82,638,000
Securities Available-for-Sale, 12 months or longer, Fair value 614,417,000   310,338,000
USGovernmentSponsored asset backed securities and US Treasury obligations      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 84,200,000    
Collateral Pledged [Member]      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Restricted $ 722,600,000   $ 753,600,000