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Investment Securities (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale $ 817,713,000   $ 996,624,000
Debt Securities, Available-for-sale, Unrealized Loss Position 674,803,000   786,464,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 54,738,000   80,085,000
Securities Available-for-Sale, 12 months or longer, Fair value 604,800,000   700,469,000
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0
Debt Securities, Available-for-sale, Amortized Cost $ 871,447,000   1,076,281,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Gain (Loss) on Sale of Investments $ 0 $ 398,000  
Debt securities available for sale, securities sold 0 31,200,000  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff 0 $ 0  
U.S. Government Sponsored Entities Asset-Backed Securities [Member]      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale 498,162,000   518,576,000
Debt Securities, Available-for-sale, Unrealized Loss Position 461,747,000   517,401,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 38,411,000   61,694,000
Securities Available-for-Sale, 12 months or longer, Fair value 449,051,000   510,846,000
Debt Securities, Available-for-sale, Amortized Cost 536,113,000   580,268,000
USGovernmentSponsored asset backed securities and US Treasury obligations      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 38,400,000    
Collateral Pledged [Member]      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Restricted $ 622,200,000   $ 599,200,000